Add Svelte-native live mode adapter (#179)

* Fix live preview state for framework components

* Complete stateful live preview coverage

* Record Svelte manual validation

* Fix Svelte live mode adapter

* Fix live Steer apply flow

* Fix Svelte live variant refresh recovery

* Fix live exit bar teardown

* Consolidate Svelte live DeepSeek sweep

* Reconcile Svelte live browser after main rebase

* Fix live accept review regressions

* Fix carbonize column-zero indentation

* Fix live poll lease expiry flake

* Fix Svelte shader preview capture

.agents/skills/impeccable/reference/live.md

@@ -113,7 +113,9 @@ node .agents/skills/impeccable/scripts/live-insert.mjs --id EVENT_ID --count EVE
 
 The scaffold has **no** `data-impeccable-variant="original"`. Variants are net-new HTML+CSS inserted at `insertLine`. Load `brand.md` or `product.md` (freeform only, no action sub-command). Write all variants in one edit, then `--reply done`.
 
-On accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
+For Svelte/SvelteKit targets, `live-insert.mjs` returns `previewMode: "svelte-component"` with `mode: "insert"`, `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each inserted variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`. Insert variants must be non-empty net-new content with a single top-level root, no `data-impeccable-*` attributes, and CSS in each component's `<style>` block. Do **not** edit the route source during generation; the browser mounts the temporary component before/after the live anchor while the user cycles variants. On Accept, `live-accept.mjs` inserts the selected component markup into `sourceFile` immediately and deletes the temp session after the source write succeeds.
+
+For non-Svelte targets, on accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
 
 ### Replace mode (default)
 
@@ -151,6 +153,25 @@ If `--text` matches multiple candidates equally well, wrap exits with `{ error:
 
 Output on success: `{ file, insertLine, commentSyntax, styleMode, styleTag, cssSelectorPrefixExamples, cssAuthoring }`.
 
+For Svelte/SvelteKit targets, `live-wrap.mjs` returns `previewMode: "svelte-component"` with `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`; use the `propContract` prop names for dynamic text (`{propName}`), not literal snapshot strings. Put variant CSS in each component's `<style>` block with semantic class selectors (no `@scope`, no `data-impeccable-*`). Reply with `--file` set to the manifest path; the browser dynamically imports and mounts the compiled components so Svelte HMR does not reset page state while the user cycles variants. On Accept, `live-accept.mjs` inlines the accepted component back into `sourceFile` immediately after source promotion succeeds.
+
+**Params on the Svelte component path go in a sidecar, never as an attribute.** Svelte parses `{` inside an attribute value as the start of an expression, so a `data-impeccable-params='[{…}]'` attribute on a component element fails to compile (`Expected token }`). Declare params for this path in `componentDir/params.json`, keyed by variant number, using the exact param schema from section 7:
+
+```json
+{
+  "1": [
+    {"id":"density","kind":"steps","default":"snug","label":"Density","options":[
+      {"value":"airy","label":"Airy"},{"value":"snug","label":"Snug"},{"value":"packed","label":"Packed"}
+    ]}
+  ],
+  "2": [
+    {"id":"accent","kind":"range","min":0,"max":1,"step":0.05,"default":0.5,"label":"Accent"}
+  ]
+}
+```
+
+Author the component `<style>` against `var(--p-<id>, default)` for `range`/`toggle` and `[data-p-<id>="…"]` for `steps`; wrap those selectors in `:global(...)` so the knob values the runtime sets on the mounted root reach your rules. The browser reads `params.json`, docks the panel, and drives `--p-*` / `data-p-*` on the mounted component exactly as it does for the HTML/JSX path.
+
 `styleMode` controls how preview CSS must be authored. Treat it as a detected capability mode, not a framework guess:
 
 - `scoped`: use `@scope ([data-impeccable-variant="N"])` rules.
@@ -342,7 +363,7 @@ Each variant can expose **coarse** knobs alongside the full HTML/CSS replacement
 
 **Hard cap per variant**: at most **four** parameters so the panel stays legible; rare fifth only if the reference explicitly allows it.
 
-**How to declare.** Put a JSON manifest on the variant wrapper:
+**How to declare.** Put a JSON manifest on the variant wrapper (HTML/JSX path). **On the Svelte `svelte-component` path, do not use this attribute** (Svelte can't compile `{` inside an attribute value). Declare params in `componentDir/params.json` keyed by variant number instead (see the Svelte component paragraph in the wrap section). The param schema below is identical for both paths.
 
 ```html
 <div data-impeccable-variant="1" data-impeccable-params='[
@@ -456,7 +477,7 @@ Do these five steps in the current thread, synchronously, before the next poll.
 1. **Locate the carbonize block** in the source file (`_acceptResult.file`). It's bracketed by `<!-- impeccable-carbonize-start SESSION_ID -->` and `<!-- impeccable-carbonize-end SESSION_ID -->` and contains a `<style data-impeccable-css="SESSION_ID">` element. If the variant declared parameters, an `<!-- impeccable-param-values SESSION_ID: {...} -->` comment sits alongside the style tag with the user's chosen values; read it first; it drives steps 3 and 4 below.
 2. **Move the CSS rules** into the project's real stylesheet. Which stylesheet depends on the project (e.g. `site/styles/workflow.css` for an Astro project, or the component's co-located CSS file for a Vite/Next project; pick whichever already owns styling for the surrounding element).
 3. **Bake in parameter values while rewriting selectors.** For `@scope ([data-impeccable-variant="N"])` wrappers: retarget to real, semantic classes on the accepted HTML (`.why-visual--v2 .v2-label { … }`). For `:scope[data-p-<id>="VALUE"]` selectors: keep only the branch matching the chosen value from the param-values comment; drop the others (they're dead after accept). For `var(--p-<id>, DEFAULT)` in the CSS: either substitute the literal value, or if the param is still useful as a knob going forward, leave the var and update its initial declaration to the chosen value.
-4. **Unwrap the accepted content.** Delete the `<div data-impeccable-variant="N" style="display: contents">` that wraps it. Drop `data-impeccable-params` and any `data-p-*` attributes from it; those are live-mode plumbing, not source.
+4. **Unwrap the accepted content.** Delete the inner `<div data-impeccable-variant="N" style="display: contents">` that wraps it. On JSX/TSX, also delete the outer `<div data-impeccable-carbonize="SESSION_ID" style={{ display: 'contents' }}>` wrapper if present (accept adds it so ternary/`return` slots keep a single root). Drop `data-impeccable-params` and any `data-p-*` attributes; those are live-mode plumbing, not source.
 5. **Delete the inline `<style>` block, the `<!-- impeccable-param-values -->` comment if present, and both `<!-- impeccable-carbonize-start/end -->` markers.** Also drop any `@scope` rules for variants other than the accepted one; those are dead code now.
 
 After the file is clean, run `live-complete.mjs --id SESSION_ID`, verify it reports `phase: "completed"`, then poll again.

.agents/skills/impeccable/scripts/live-accept.mjs

@@ -17,6 +17,12 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer, writeBuffer as writeManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  findSvelteComponentManifest,
+  inlineSvelteComponentAccept,
+  removeSvelteComponentSession,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -41,6 +47,9 @@ Required:
 
 Options:
   --page-url URL     Current browser page URL; scopes staged copy-edit cleanup
+  --defer-source-write
+                     Deprecated compatibility flag. Svelte component accepts
+                     now write the real source immediately.
 
 Output (JSON):
   { handled, file, carbonize }`);
@@ -64,18 +73,67 @@ Output (JSON):
 
   // Find the file containing this session's markers
   const found = findSessionFile(id, process.cwd());
-  if (!found) {
+  const svelteComponentManifest = found ? null : findSvelteComponentManifest(id, process.cwd());
+
+  if (!found && !svelteComponentManifest) {
     console.log(JSON.stringify({ handled: false, error: 'Session markers not found for id: ' + id }));
     process.exit(0);
   }
 
+  if (svelteComponentManifest) {
+    if (isDiscard) {
+      removeSvelteComponentSession(id, process.cwd());
+      console.log(JSON.stringify({
+        handled: true,
+        file: svelteComponentManifest.sourceFile,
+        carbonize: false,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      }));
+      return;
+    }
+
+    let result;
+    try {
+      result = inlineSvelteComponentAccept(
+        svelteComponentManifest,
+        variantNum,
+        paramValues,
+        process.cwd(),
+      );
+    } catch (err) {
+      result = {
+        handled: false,
+        error: err.message,
+        file: svelteComponentManifest.sourceFile,
+        sourceFile: svelteComponentManifest.sourceFile,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      };
+    }
+    if (result.carbonize) {
+      result.todo = 'REQUIRED before next poll: carbonize cleanup in ' + result.file + '. See reference/live.md "Required after accept".';
+    }
+    console.log(JSON.stringify({ handled: result.handled !== false, ...result }));
+    return;
+  }
+
   const { file: targetFile, content, lines } = found;
   const relFile = path.relative(process.cwd(), targetFile);
+  const previewBlock = findMarkerBlock(id, lines);
+  const sourceShadowPreview = previewBlock
+    ? readSourceShadowPreviewMeta(content, id)
+    : null;
+
+  if (sourceShadowPreview) {
+    console.log(JSON.stringify({
+      handled: false,
+      error: 'source_shadow_preview_deprecated',
+      hint: 'Svelte live mode now uses svelte-component injection. Re-wrap the element and regenerate variants.',
+    }));
+    process.exit(0);
+  }
 
-  // Bail if the session lives in a generated file. The agent manually wrote
-  // the wrapper there for preview, and is responsible for writing the
-  // accepted variant to true source (or cleaning up on discard). See
-  // "Handle fallback" in live.md.
   if (isGeneratedFile(targetFile, { cwd: process.cwd() })) {
     console.log(JSON.stringify({
       handled: false,
@@ -207,6 +265,71 @@ function handleDiscard(id, lines, targetFile) {
 // Accept
 // ---------------------------------------------------------------------------
 
+/**
+ * Build carbonize stitch-in lines. JSX targets occupy a single child slot
+ * (ternary branch, return value, etc.) — the same constraint as live-wrap.
+ * When isJsx, tuck markers + <style> + variant wrapper inside one outer
+ * <div data-impeccable-carbonize> so the slot keeps a single root node.
+ */
+function buildCarbonizeReplacement({
+  indent,
+  commentSyntax,
+  isJsx,
+  id,
+  variantNum,
+  cssContent,
+  paramValues,
+  restored,
+}) {
+  const lines = [];
+  if (!cssContent) {
+    lines.push(...restored);
+    return lines;
+  }
+
+  const variantStyleAttr = isJsx
+    ? "style={{ display: 'contents' }}"
+    : 'style="display: contents"';
+
+  const pushCarbonizeBody = (bodyIndent) => {
+    const bodyRestored = reindentContent(restored, indent, bodyIndent + '  ');
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    for (const cssLine of cssContent) {
+      lines.push(bodyIndent + cssLine.trimStart());
+    }
+    lines.push(bodyIndent + (isJsx ? '`}</style>' : '</style>'));
+    if (paramValues && Object.keys(paramValues).length > 0) {
+      lines.push(
+        bodyIndent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close,
+      );
+    }
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<div data-impeccable-variant="' + variantNum + '" ' + variantStyleAttr + '>');
+    lines.push(...bodyRestored);
+    lines.push(bodyIndent + '</div>');
+  };
+
+  if (isJsx) {
+    const wrapperStyle = 'style={{ display: "contents" }}';
+    lines.push(indent + '<div data-impeccable-carbonize="' + id + '" ' + wrapperStyle + '>');
+    pushCarbonizeBody(indent + '  ');
+    lines.push(indent + '</div>');
+  } else {
+    pushCarbonizeBody(indent);
+  }
+
+  return lines;
+}
+
+function reindentContent(contentLines, fromIndent, toIndent) {
+  return contentLines.map((line) => {
+    if (line.trim() === '') return '';
+    if (line.startsWith(fromIndent)) return toIndent + line.slice(fromIndent.length);
+    return toIndent + line.trimStart();
+  });
+}
+
 function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const block = findMarkerBlock(id, lines);
   if (!block) return { handled: false, error: 'Markers not found' };
@@ -235,45 +358,17 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const hasHelperAttrs = variantText.includes('data-impeccable-variant');
   const needsCarbonize = !!(cssContent || hasHelperAttrs);
 
-  // Build the replacement
   const restored = deindentContent(variantContent, indent);
-  const replacement = [];
+  const replacement = buildCarbonizeReplacement({
-
+    indent,
-  if (cssContent) {
+    commentSyntax,
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    isJsx,
-    // JSX targets need the CSS body wrapped in a template literal so that the
+    id,
-    // `{` and `}` in CSS rules don't get parsed as JSX expressions.
+    variantNum,
-    replacement.push(indent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    cssContent,
-    // Re-indent CSS content to match
+    paramValues,
-    for (const cssLine of cssContent) {
+    restored,
-      replacement.push(indent + cssLine.trimStart());
+  });
-    }
-    replacement.push(indent + (isJsx ? '`}</style>' : '</style>'));
-    if (paramValues && Object.keys(paramValues).length > 0) {
-      // Preserve the user's knob positions for the carbonize-cleanup agent
-      // to bake into the final CSS when it collapses scoped rules.
-      replacement.push(indent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close);
-    }
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
-  }
-
-  // Keep the `@scope ([data-impeccable-variant="N"])` selectors in the
-  // carbonize CSS block working visually by re-wrapping the accepted content
-  // in a data-impeccable-variant="N" div with `display: contents` (so layout
-  // isn't affected). The carbonize agent strips this attribute + wrapper when
-  // it moves the CSS to a proper stylesheet.
-  //
-  // Style attribute syntax has to follow the host file's flavor — JSX files
-  // need the object form, otherwise React 19 throws "Failed to set indexed
-  // property [0] on CSSStyleDeclaration" while parsing the string char-by-char.
-  if (cssContent) {
-    const styleAttr = isJsx ? "style={{ display: 'contents' }}" : 'style="display: contents"';
-    replacement.push(indent + '<div data-impeccable-variant="' + variantNum + '" ' + styleAttr + '>');
-    replacement.push(...restored);
-    replacement.push(indent + '</div>');
-  } else {
-    replacement.push(...restored);
-  }
 
   const newLines = [
     ...lines.slice(0, replaceRange.start),
@@ -285,6 +380,34 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   return { carbonize: needsCarbonize, acceptedOriginalText: originalContent.join('\n') };
 }
 
+function readSourceShadowPreviewMeta(content, id) {
+  const escaped = escapeRegExp(id);
+  const wrapperRe = new RegExp('<[^>]+data-impeccable-variants=(["\'])' + escaped + '\\1[^>]*>');
+  const match = String(content || '').match(wrapperRe);
+  if (!match) return null;
+  const tag = match[0];
+  if (readHtmlAttr(tag, 'data-impeccable-preview') !== 'source-shadow') return null;
+  const sourceFile = readHtmlAttr(tag, 'data-impeccable-source-file');
+  const sourceStartLine = Number(readHtmlAttr(tag, 'data-impeccable-source-start'));
+  const sourceEndLine = Number(readHtmlAttr(tag, 'data-impeccable-source-end'));
+  if (!sourceFile || !Number.isFinite(sourceStartLine) || !Number.isFinite(sourceEndLine)) return null;
+  return { sourceFile, sourceStartLine, sourceEndLine };
+}
+
+function readHtmlAttr(tag, name) {
+  const match = String(tag || '').match(new RegExp('\\s' + escapeRegExp(name) + '\\s*=\\s*(["\'])(.*?)\\1'));
+  if (!match) return null;
+  return decodeHtmlAttr(match[2]);
+}
+
+function decodeHtmlAttr(value) {
+  return String(value || '')
+    .replace(/&quot;/g, '"')
+    .replace(/&lt;/g, '<')
+    .replace(/&gt;/g, '>')
+    .replace(/&amp;/g, '&');
+}
+
 // ---------------------------------------------------------------------------
 // Parsing helpers
 // ---------------------------------------------------------------------------
@@ -686,4 +809,4 @@ if (_running?.endsWith('live-accept.mjs') || _running?.endsWith('live-accept.mjs
   acceptCli();
 }
 
-export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock };
+export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock, applyDeferredSvelteComponentAccepts };

.agents/skills/impeccable/scripts/live-completion.mjs

@@ -3,6 +3,7 @@ export function completionTypeForAcceptResult(eventType, acceptResult) {
   if (acceptResult?.handled === true && acceptResult?.carbonize === true) return 'agent_done';
   if (acceptResult?.handled === true) return 'complete';
   if (acceptResult?.mode === 'error') return 'error';
+  if (eventType === 'accept' && acceptResult?.previewMode === 'svelte-component') return 'error';
   return 'agent_done';
 }
 

.agents/skills/impeccable/scripts/live-inject.mjs

@@ -17,11 +17,38 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { resolveLiveConfigPath } from './impeccable-paths.mjs';
+import {
+  applySvelteKitLiveAdapter,
+  detectSvelteKitProject,
+  removeSvelteKitLiveAdapter,
+} from './live-sveltekit-adapter.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const CONFIG_PATH = resolveLiveConfigPath({ cwd: process.cwd(), scriptsDir: __dirname });
 const MARKER_OPEN_TEXT = 'impeccable-live-start';
 const MARKER_CLOSE_TEXT = 'impeccable-live-end';
+const IGNORE_MARKER_OPEN = '# impeccable-live-ignore-start';
+const IGNORE_MARKER_CLOSE = '# impeccable-live-ignore-end';
+
+export const LIVE_IGNORE_PATTERNS = Object.freeze([
+  '.impeccable/hook.cache.json',
+  '.impeccable/live/server.json',
+  '.impeccable/live/sessions/',
+  '.impeccable/live/previews/',
+  '.impeccable/live/annotations/',
+  '.impeccable/live/cache/',
+  '.impeccable/live/manual-edit-apply-transaction.json',
+  '.impeccable/live/manual-edit-events.jsonl',
+  '.impeccable/live/manual-edit-evidence/',
+  '.impeccable/live/pending-manual-edits.json',
+  '.impeccable/live/deferred-svelte-component-accepts.json',
+  '.impeccable-live.json',
+  '.impeccable-live/',
+  'node_modules/.impeccable-live/',
+  'src/lib/impeccable/ImpeccableLiveRoot.svelte',
+  'src/lib/impeccable/__runtime.js',
+  'src/lib/impeccable/[0-9a-f]*/',
+]);
 
 /**
  * Hard-excluded directory patterns. These are NEVER user-facing pages and
@@ -83,8 +110,14 @@ Output (JSON):
   validateConfig(config);
 
   const resolvedFiles = resolveFiles(process.cwd(), config);
+  const svelteKit = detectSvelteKitProject(process.cwd(), config);
 
   if (args.includes('--remove')) {
+    if (svelteKit) {
+      const adapterResult = removeSvelteKitLiveAdapter({ cwd: process.cwd(), config });
+      console.log(JSON.stringify({ ok: true, adapter: 'sveltekit', results: [adapterResult] }));
+      return;
+    }
     const results = resolvedFiles.map((relFile) => {
       const absFile = path.resolve(process.cwd(), relFile);
       if (!fs.existsSync(absFile)) return { file: relFile, error: 'file_not_found' };
@@ -110,6 +143,13 @@ Output (JSON):
     console.error(JSON.stringify({ ok: false, error: 'missing_port' }));
     process.exit(1);
   }
+  const gitIgnore = ensureLiveGitIgnores(process.cwd());
+
+  if (svelteKit) {
+    const adapterResult = applySvelteKitLiveAdapter({ cwd: process.cwd(), port, config });
+    console.log(JSON.stringify({ ok: true, port, adapter: 'sveltekit', gitIgnore, results: [adapterResult] }));
+    return;
+  }
 
   const results = resolvedFiles.map((relFile) => {
     const absFile = path.resolve(process.cwd(), relFile);
@@ -129,10 +169,68 @@ Output (JSON):
     };
   });
   const anyInserted = results.some((r) => r.inserted);
-  console.log(JSON.stringify({ ok: anyInserted, port, results }));
+  console.log(JSON.stringify({ ok: anyInserted, port, gitIgnore, results }));
   if (!anyInserted) process.exit(1);
 }
 
+export function ensureLiveGitIgnores(cwd = process.cwd()) {
+  const target = resolveIgnoreTarget(cwd);
+  const existing = fs.existsSync(target.path) ? fs.readFileSync(target.path, 'utf-8') : '';
+  const block = [
+    IGNORE_MARKER_OPEN,
+    ...LIVE_IGNORE_PATTERNS,
+    IGNORE_MARKER_CLOSE,
+  ].join('\n');
+  const markerRe = new RegExp(`${escapeRegExp(IGNORE_MARKER_OPEN)}[\\s\\S]*?${escapeRegExp(IGNORE_MARKER_CLOSE)}`);
+
+  let updated;
+  if (markerRe.test(existing)) {
+    updated = existing.replace(markerRe, block);
+  } else {
+    const prefix = existing.length === 0 ? '' : existing.endsWith('\n') ? existing : existing + '\n';
+    updated = `${prefix}${prefix.endsWith('\n\n') || prefix === '' ? '' : '\n'}${block}\n`;
+  }
+
+  if (updated !== existing) {
+    fs.mkdirSync(path.dirname(target.path), { recursive: true });
+    fs.writeFileSync(target.path, updated, 'utf-8');
+  }
+
+  return {
+    file: path.relative(cwd, target.path).split(path.sep).join('/'),
+    mode: target.mode,
+    changed: updated !== existing,
+    patterns: [...LIVE_IGNORE_PATTERNS],
+  };
+}
+
+function resolveIgnoreTarget(cwd) {
+  const gitExcludePath = resolveGitInfoExcludePath(cwd);
+  if (gitExcludePath) {
+    return { path: gitExcludePath, mode: 'git-info-exclude' };
+  }
+  return { path: path.join(cwd, '.gitignore'), mode: 'gitignore' };
+}
+
+function resolveGitInfoExcludePath(cwd) {
+  const dotGit = path.join(cwd, '.git');
+  if (!fs.existsSync(dotGit)) return null;
+
+  const stat = fs.statSync(dotGit);
+  if (stat.isDirectory()) return path.join(dotGit, 'info', 'exclude');
+  if (!stat.isFile()) return null;
+
+  const body = fs.readFileSync(dotGit, 'utf-8').trim();
+  const match = body.match(/^gitdir:\s*(.+)$/i);
+  if (!match) return null;
+  const gitDir = path.isAbsolute(match[1]) ? match[1] : path.resolve(cwd, match[1]);
+  return path.join(gitDir, 'info', 'exclude');
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
 /**
  * Expand config.files (which may contain glob patterns) into a literal list
  * of existing file paths relative to rootDir. Literal entries pass through;

.agents/skills/impeccable/scripts/live-insert.mjs

@@ -21,6 +21,11 @@ import {
   buildCssAuthoring,
   buildCssSelectorPrefixExamples,
 } from './live-wrap.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentInsertSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const INSERT_POSITIONS = new Set(['before', 'after']);
 
@@ -192,6 +197,41 @@ Output (JSON):
   const styleMode = detectStyleMode(targetFile);
   const isJsx = commentSyntax.open === '{/*';
   const spliceIndex = computeInsertLine(startLine, endLine, position);
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+
+  if (shouldUseSvelteComponentInjection(targetFile)) {
+    const session = scaffoldSvelteComponentInsertSession({
+      id,
+      count,
+      sourceFile: relTargetFile,
+      insertLine: spliceIndex + 1,
+      position,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      anchorLines: lines.slice(startLine, endLine + 1),
+      cwd: process.cwd(),
+    });
+    console.log(JSON.stringify({
+      mode: 'insert',
+      position,
+      file: session.manifestFile,
+      sourceFile: relTargetFile,
+      previewMode: 'svelte-component',
+      componentDir: session.componentDir,
+      propContract: session.propContract,
+      insertLine: 1,
+      sourceInsertLine: spliceIndex + 1,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      commentSyntax,
+      styleMode: 'svelte-component',
+      styleTag: null,
+      cssSelectorPrefixExamples: [],
+      cssAuthoring: buildSvelteComponentCssAuthoring(count),
+    }));
+    return;
+  }
+
   const indent = lines[spliceIndex]?.match(/^(\s*)/)?.[1]
     ?? lines[startLine]?.match(/^(\s*)/)?.[1]
     ?? '';
@@ -216,7 +256,7 @@ Output (JSON):
   console.log(JSON.stringify({
     mode: 'insert',
     position,
-    file: path.relative(process.cwd(), targetFile),
+    file: relTargetFile,
     insertLine: insertLine + 1,
     commentSyntax,
     styleMode: styleMode.mode,

.agents/skills/impeccable/scripts/live-poll.mjs

@@ -20,6 +20,7 @@ import { readLiveServerInfo } from './impeccable-paths.mjs';
 // that ceiling and loop in `pollOnce` to synthesize a long poll without
 // depending on the standalone undici package.
 export const PER_REQUEST_TIMEOUT_MS = 270_000;
+export const DEFAULT_EVENT_LEASE_MS = 600_000;
 
 const EVENT_TYPES_NEEDING_AGENT_REPLY = new Set(['generate', 'steer', 'manual_edit_apply']);
 
@@ -156,7 +157,7 @@ export async function fetchNextEvent(base, token, { totalDeadline } = {}) {
       ? totalDeadline - Date.now()
       : PER_REQUEST_TIMEOUT_MS;
     const slice = Math.min(Math.max(remaining, 1000), PER_REQUEST_TIMEOUT_MS);
-    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}`);
+    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}&leaseMs=${DEFAULT_EVENT_LEASE_MS}`);
 
     if (res.status === 401) {
       const err = new Error('Authentication failed. The server token may have changed.');
@@ -317,7 +318,7 @@ Modes:
 Options:
   --timeout=MS        One-shot poll timeout in ms (default: 600000). Ignored in --stream mode
   --ack-timeout=MS    Stream mode: max wait for --reply after generate/steer (default: 600000)
-  --file PATH         Attach a source file path to the reply (generate flow)
+  --file PATH         Attach a source file path to the reply (generate/steer flow)
   --data JSON         Attach a JSON result object to the reply (manual_edit_apply flow). Must be valid JSON
   --help              Show this help message
 

.agents/skills/impeccable/scripts/live-server.mjs

@@ -42,6 +42,10 @@ import {
 } from './live-manual-edits-buffer.mjs';
 import { buildManualEditEvidence } from './live-manual-edit-evidence.mjs';
 import { commitManualEdits } from './live-commit-manual-edits.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  removeAllSvelteComponentSessions,
+} from './live-svelte-component.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 // PRODUCT.md / DESIGN.md live wherever context.mjs resolves. The generated
@@ -103,6 +107,7 @@ const MIN_MANUAL_EDIT_APPLY_CHUNK_SIZE = 1;
 const MAX_MANUAL_EDIT_APPLY_CHUNK_SIZE = 20;
 const MANUAL_APPLY_COMPACT_TEXT_LIMIT = 240;
 const MANUAL_APPLY_COMPACT_NEARBY_LIMIT = 4;
+const POLL_LEASE_EXPIRY_TIMER_GRACE_MS = 2;
 const DEBUG_MANUAL_EDIT_EVENTS = /^(1|true|yes)$/i.test(process.env.IMPECCABLE_LIVE_DEBUG_EVENTS || '');
 
 function tombstoneTimedOutApplyId(eventId, details = {}) {
@@ -897,6 +902,8 @@ function leaseEvent(entry, leaseMs) {
     return entry.event;
   }
   entry.leaseUntil = Date.now() + leaseMs;
+  scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return entry.event;
 }
 
@@ -907,9 +914,16 @@ function acknowledgePendingEvent(id) {
   const acknowledged = state.pendingEvents[idx].event;
   state.pendingEvents.splice(idx, 1);
   scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return acknowledged;
 }
 
+function findPendingEventById(id) {
+  if (!id) return null;
+  const entry = state.pendingEvents.find((item) => item.event?.id === id);
+  return entry?.event || null;
+}
+
 function manualApplyReplyCommand(eventOrId = 'EVENT_ID') {
   const id = typeof eventOrId === 'string' ? eventOrId : eventOrId?.id || 'EVENT_ID';
   return `live-poll.mjs --reply ${id} done --data '<json>'`;
@@ -955,6 +969,42 @@ function summarizePendingEventForStatus(entry) {
   return summary;
 }
 
+function summarizeActiveSessionForClient(snapshot = {}) {
+  return {
+    id: snapshot.id,
+    phase: snapshot.phase,
+    pageUrl: snapshot.pageUrl ?? null,
+    sourceFile: snapshot.sourceFile ?? null,
+    previewFile: snapshot.previewFile ?? null,
+    previewMode: snapshot.previewMode ?? null,
+    expectedVariants: snapshot.expectedVariants ?? 0,
+    arrivedVariants: snapshot.arrivedVariants ?? 0,
+    visibleVariant: snapshot.visibleVariant ?? null,
+    checkpointRevision: snapshot.checkpointRevision ?? 0,
+    paramValues: snapshot.paramValues || {},
+  };
+}
+
+function activeSessionSummaries() {
+  if (!state.sessionStore) return [];
+  return state.sessionStore.listActiveSessions().map((snapshot) => summarizeActiveSessionForClient(snapshot));
+}
+
+function cancelQueuedAnonymousExitEvents() {
+  let removed = 0;
+  for (let i = state.pendingEvents.length - 1; i >= 0; i -= 1) {
+    const event = state.pendingEvents[i]?.event;
+    if (event?.type !== 'exit' || event.id) continue;
+    state.pendingEvents.splice(i, 1);
+    removed += 1;
+  }
+  if (removed > 0) {
+    scheduleLeaseFlush();
+    broadcastAgentPollingIfChanged();
+  }
+  return removed;
+}
+
 function cancelPendingManualApplyEvents(pageUrl, reason = 'manual_edit_discarded') {
   const canceledById = new Map();
   const shouldCancel = (event) => event?.type === 'manual_edit_apply' && (!pageUrl || event.pageUrl === pageUrl);
@@ -1001,7 +1051,6 @@ function scheduleLeaseFlush() {
     clearTimeout(state.leaseTimer);
     state.leaseTimer = null;
   }
-  if (state.pendingPolls.length === 0) return;
   const now = Date.now();
   const nextLeaseUntil = state.pendingEvents
     .map((entry) => entry.leaseUntil || 0)
@@ -1011,7 +1060,8 @@ function scheduleLeaseFlush() {
   state.leaseTimer = setTimeout(() => {
     state.leaseTimer = null;
     flushPendingPolls();
-  }, Math.max(0, nextLeaseUntil - now));
+    broadcastAgentPollingIfChanged();
+  }, Math.max(0, nextLeaseUntil - now + POLL_LEASE_EXPIRY_TIMER_GRACE_MS));
 }
 
 function flushPendingPolls() {
@@ -1032,7 +1082,9 @@ function flushPendingPolls() {
 }
 
 function agentPollingConnected() {
-  return state.pendingPolls.length > 0;
+  const now = Date.now();
+  return state.pendingPolls.length > 0
+    || state.pendingEvents.some((entry) => entry.leaseUntil && entry.leaseUntil > now);
 }
 
 function broadcastAgentPollingIfChanged() {
@@ -1318,7 +1370,7 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/status') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401, { 'Content-Type': 'application/json' }); res.end(JSON.stringify({ error: 'Unauthorized' })); return; }
-      const sessions = state.sessionStore ? state.sessionStore.listActiveSessions() : [];
+      const sessions = activeSessionSummaries();
       res.writeHead(200, { 'Content-Type': 'application/json' });
       res.end(JSON.stringify({
         status: 'ok',
@@ -1423,6 +1475,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/events' && req.method === 'GET') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401); res.end('Unauthorized'); return; }
+      clearTimeout(state.exitTimer);
+      state.exitTimer = null;
+      cancelQueuedAnonymousExitEvents();
       res.writeHead(200, {
         'Content-Type': 'text/event-stream',
         'Cache-Control': 'no-cache',
@@ -1432,10 +1487,10 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
         type: 'connected',
         hasProjectContext: hasProjectContext(),
         agentPolling: agentPollingConnected(),
+        activeSessions: activeSessionSummaries(),
       }) + '\n\n');
 
       state.sseClients.add(res);
-      clearTimeout(state.exitTimer);
 
       // Keepalive: SSE comment every 30s prevents silent connection drops.
       const heartbeat = setInterval(() => {
@@ -1827,6 +1882,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
             return;
           }
         }
+        if (msg.type === 'exit') {
+          cleanupSvelteComponentSessionsBeforeExit();
+        }
         if (msg.type !== 'checkpoint') {
           enqueueEvent(msg);
         }
@@ -1905,6 +1963,36 @@ function handlePollGet(req, res, url) {
   });
 }
 
+function sessionFileMetadataFromPollReply(file) {
+  if (!file || typeof file !== 'string') return { file };
+  const normalized = file.split(path.sep).join('/');
+  const base = { file: normalized };
+  if (!normalized.endsWith('/manifest.json') && normalized !== 'manifest.json') return base;
+  if (!normalized.includes('node_modules/.impeccable-live/') && !normalized.includes('src/lib/impeccable/')) return base;
+
+  let full;
+  try {
+    full = path.resolve(process.cwd(), normalized);
+    const rel = path.relative(process.cwd(), full);
+    if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) return base;
+  } catch {
+    return base;
+  }
+
+  try {
+    const manifest = JSON.parse(fs.readFileSync(full, 'utf-8'));
+    if (manifest?.previewMode !== 'svelte-component' || !manifest.sourceFile) return base;
+    return {
+      file: String(manifest.sourceFile).split(path.sep).join('/'),
+      sourceFile: String(manifest.sourceFile).split(path.sep).join('/'),
+      previewFile: normalized,
+      previewMode: 'svelte-component',
+    };
+  } catch {
+    return base;
+  }
+}
+
 function handlePollPost(req, res) {
   let body = '';
   req.on('data', (c) => { body += c; });
@@ -1965,6 +2053,16 @@ function handlePollPost(req, res) {
       res.end(JSON.stringify({ error: 'stale_manual_edit_apply_reply', ...rollback }));
       return;
     }
+    const pendingEventBeforeAck = findPendingEventById(msg.id);
+    if (pendingEventBeforeAck?.type === 'steer' && msg.type === 'steer_done'
+        && !msg.file && !(typeof msg.message === 'string' && msg.message.trim())) {
+      res.writeHead(400, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({
+        error: 'steer_done_requires_file_or_message',
+        hint: 'Reply with --file after writing source, or include a message explaining an intentional no-op.',
+      }));
+      return;
+    }
     const acknowledgedEvent = acknowledgePendingEvent(msg.id);
     let skipJournalReply = false;
     let existingSession = null;
@@ -1987,6 +2085,7 @@ function handlePollPost(req, res) {
       }));
       return;
     }
+    const replyFileMeta = sessionFileMetadataFromPollReply(msg.file);
     if (state.sessionStore && msg.id && !skipJournalReply) {
       try {
         const eventType = msg.type === 'steer_done'
@@ -2001,7 +2100,10 @@ function handlePollPost(req, res) {
         state.sessionStore.appendEvent({
           type: eventType,
           id: msg.id,
-          file: msg.file,
+          file: replyFileMeta.file,
+          sourceFile: replyFileMeta.sourceFile,
+          previewFile: replyFileMeta.previewFile,
+          previewMode: replyFileMeta.previewMode,
           message: msg.message,
           sourceEventType: acknowledgedEvent?.type,
           carbonize: msg.data?.carbonize === true,
@@ -2010,7 +2112,16 @@ function handlePollPost(req, res) {
     }
     flushPendingPolls();
     // Forward the reply to the browser via SSE
-    broadcast({ type: msg.type || 'done', id: msg.id, message: msg.message, file: msg.file, data: msg.data });
+    broadcast({
+      type: msg.type || 'done',
+      id: msg.id,
+      message: msg.message,
+      file: msg.file,
+      sourceFile: replyFileMeta.sourceFile,
+      previewFile: replyFileMeta.previewFile,
+      previewMode: replyFileMeta.previewMode,
+      data: msg.data,
+    });
     res.writeHead(200, { 'Content-Type': 'application/json' });
     res.end(JSON.stringify({ ok: true }));
   });
@@ -2023,6 +2134,7 @@ function handlePollPost(req, res) {
 let httpServer = null;
 
 function shutdown() {
+  cleanupSvelteComponentSessionsBeforeExit();
   removeLiveServerInfo(process.cwd());
   if (state.leaseTimer) clearTimeout(state.leaseTimer);
   state.leaseTimer = null;
@@ -2037,6 +2149,25 @@ function shutdown() {
   process.exit(0);
 }
 
+function cleanupSvelteComponentSessionsBeforeExit() {
+  try {
+    removeAllSvelteComponentSessions(process.cwd());
+  } catch (err) {
+    console.warn('[impeccable] Svelte component session cleanup failed:', err.message);
+  }
+}
+
+function applyLegacyDeferredAcceptsOnStartup() {
+  try {
+    const result = applyDeferredSvelteComponentAccepts(process.cwd());
+    if (result.applied > 0 || result.failed > 0) {
+      console.log('[impeccable] applied legacy deferred Svelte component accepts:', JSON.stringify(result));
+    }
+  } catch (err) {
+    console.warn('[impeccable] legacy deferred Svelte component accept apply failed:', err.message);
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Main
 // ---------------------------------------------------------------------------
@@ -2162,6 +2293,7 @@ rollbackManualApplyTransaction({
   cwd: process.cwd(),
   reason: 'manual_edit_server_start_recovered_abandoned_transaction',
 });
+applyLegacyDeferredAcceptsOnStartup();
 restorePendingEventsFromStore();
 pruneStaleManualApplyEvidence(process.cwd());
 const portArg = args.find(a => a.startsWith('--port='));

.agents/skills/impeccable/scripts/live-session-store.mjs

@@ -106,6 +106,8 @@ function baseSnapshot(id) {
     phase: 'new',
     pageUrl: null,
     sourceFile: null,
+    previewFile: null,
+    previewMode: null,
     expectedVariants: 0,
     arrivedVariants: 0,
     visibleVariant: null,
@@ -177,8 +179,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
     case 'variants_ready':
     case 'agent_done':
       next.phase = event.carbonize === true ? 'carbonize_required' : 'variants_ready';
-      next.sourceFile = event.file ?? next.sourceFile;
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
-      next.arrivedVariants = event.arrivedVariants ?? (next.arrivedVariants ?? next.expectedVariants);
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.arrivedVariants = event.arrivedVariants ?? (next.expectedVariants || next.arrivedVariants || 0);
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       if (event.carbonize === true) {
@@ -190,12 +194,19 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       }
       break;
     case 'checkpoint':
+      if (COMPLETED_PHASES.has(next.phase)) {
+        next.diagnostics.push({ error: 'checkpoint_after_terminal_ignored', phase: event.phase ?? null, revision: event.revision ?? null });
+        break;
+      }
       if ((event.revision ?? 0) >= (next.checkpointRevision ?? 0)) {
         next.phase = event.phase ?? next.phase;
         next.checkpointRevision = event.revision ?? next.checkpointRevision;
         next.activeOwner = event.owner ?? next.activeOwner;
         next.arrivedVariants = event.arrivedVariants ?? next.arrivedVariants;
         next.visibleVariant = event.visibleVariant ?? next.visibleVariant;
+        next.sourceFile = event.sourceFile ?? next.sourceFile;
+        next.previewFile = event.previewFile ?? next.previewFile;
+        next.previewMode = event.previewMode ?? next.previewMode;
         if (event.paramValues) next.paramValues = { ...event.paramValues };
       } else {
         next.diagnostics.push({ error: 'stale_checkpoint_ignored', revision: event.revision });
@@ -223,6 +234,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'steer_done':
       next.phase = 'steer_done';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.message = event.message ?? next.message;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;
@@ -238,6 +253,9 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'complete':
       next.phase = 'completed';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;

.agents/skills/impeccable/scripts/live-svelte-component.mjs

@@ -0,0 +1,826 @@
+/**
+ * Svelte live-mode component injection helpers.
+ *
+ * Variants are real .svelte components under node_modules/.impeccable-live/<session-id>/.
+ * The browser mounts them via Svelte 5 mount(); accept inlines the chosen
+ * variant back into the route source with props mapped to original bindings.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+import os from 'node:os';
+import { createHash } from 'node:crypto';
+
+export const SVELTE_COMPONENT_ROOT = 'node_modules/.impeccable-live';
+export const SVELTE_RUNTIME_FILE = `${SVELTE_COMPONENT_ROOT}/__runtime.js`;
+export const DEFERRED_ACCEPTS_FILE = '.impeccable/live/deferred-svelte-component-accepts.json';
+
+const MUSTACHE_RE = /\{([^{}]+)\}/g;
+
+export function shouldUseSvelteComponentInjection(filePath) {
+  if (/^(0|false|no)$/i.test(process.env.IMPECCABLE_LIVE_SVELTE_COMPONENT || '')) return false;
+  return path.extname(filePath).toLowerCase() === '.svelte';
+}
+
+export function componentSessionDir(id, cwd = process.cwd()) {
+  return path.join(cwd, SVELTE_COMPONENT_ROOT, id);
+}
+
+export function manifestPathForSession(id, cwd = process.cwd()) {
+  return path.join(componentSessionDir(id, cwd), 'manifest.json');
+}
+
+export function ensureRuntimeHelper(cwd = process.cwd()) {
+  const file = path.join(cwd, SVELTE_RUNTIME_FILE);
+  if (fs.existsSync(file)) return file;
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, `export { mount, unmount } from 'svelte';\n`, 'utf-8');
+  return file;
+}
+
+/**
+ * Extract ordered unique mustache expressions from markup (not inside <!-- -->).
+ */
+export function extractMustacheExpressions(text) {
+  const expressions = [];
+  const seen = new Set();
+  const lines = String(text || '').split('\n');
+  for (const line of lines) {
+    const trimmed = line.trim();
+    if (trimmed.startsWith('<!--')) continue;
+    let match;
+    MUSTACHE_RE.lastIndex = 0;
+    while ((match = MUSTACHE_RE.exec(line)) !== null) {
+      const expr = match[1].trim();
+      if (!expr || seen.has(expr)) continue;
+      seen.add(expr);
+      expressions.push(expr);
+    }
+  }
+  return expressions;
+}
+
+export function buildPropContract(expressions) {
+  return expressions.map((expr, index) => {
+    const derived = derivePropName(expr, index);
+    return {
+      prop: derived,
+      expr,
+      placeholder: `{${expr}}`,
+    };
+  });
+}
+
+function derivePropName(expr, index) {
+  const tail = expr.match(/(?:\.|\[)(\w+)\s*\]?$/);
+  if (tail && tail[1] && /^[A-Za-z_$][\w$]*$/.test(tail[1])) {
+    return tail[1];
+  }
+  return `prop${index}`;
+}
+
+export function substituteExprsWithProps(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(entry.placeholder).join(`{${entry.prop}}`);
+  }
+  return out;
+}
+
+export function substitutePropsWithExprs(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(`{${entry.prop}}`).join(`{${entry.expr}}`);
+  }
+  return out;
+}
+
+export function parseSvelteComponentFile(content) {
+  const text = String(content || '');
+  const scriptMatch = text.match(/^([\s\S]*?)<script\b[^>]*>[\s\S]*?<\/script>/i);
+  const withoutScript = scriptMatch ? text.slice(scriptMatch[0].length) : text;
+  const styleMatch = withoutScript.match(/<style\b[^>]*>[\s\S]*?<\/style\s*>/i);
+  const styleBlock = styleMatch ? styleMatch[0] : '';
+  const markup = styleMatch
+    ? withoutScript.slice(0, styleMatch.index).trim()
+    : withoutScript.trim();
+  const cssLines = styleBlock
+    ? styleBlock
+      .replace(/^<style\b[^>]*>/i, '')
+      .replace(/<\/style\s*>$/i, '')
+      .split('\n')
+      .map((line) => line.trimEnd())
+    : [];
+  while (cssLines.length > 0 && cssLines[0].trim() === '') cssLines.shift();
+  while (cssLines.length > 0 && cssLines[cssLines.length - 1].trim() === '') cssLines.pop();
+  return { markup, cssLines, styleBlock };
+}
+
+function buildPropsScript(contract) {
+  if (contract.length === 0) {
+    return '<script>\n  /** @type {Record<string, never>} */\n  let {} = $props();\n</script>\n';
+  }
+  const names = contract.map((c) => c.prop).join(', ');
+  const typeFields = contract.map((c) => `    ${c.prop}: string;`).join('\n');
+  return `<script>\n  /** @type {{\n${typeFields}\n  }} */\n  let { ${names} } = $props();\n</script>\n`;
+}
+
+function buildVariantStub(variantNum, originalWithProps, contract) {
+  const propsComment = contract.length > 0
+    ? `\n<!-- Props: ${contract.map((c) => `${c.prop} <- {${c.expr}}`).join(', ')} -->\n`
+    : '';
+  return `${buildPropsScript(contract)}${propsComment}${originalWithProps.trim()}\n\n<style>\n  /* Variant ${variantNum}: add scoped CSS here */\n</style>\n`;
+}
+
+function buildInsertVariantStub(variantNum) {
+  return `${buildPropsScript([])}<div class="impeccable-insert-preview">Insert variant ${variantNum}</div>\n\n<style>\n  .impeccable-insert-preview { display: block; }\n</style>\n`;
+}
+
+export function scaffoldSvelteComponentSession({
+  id,
+  count,
+  sourceFile,
+  sourceStartLine,
+  sourceEndLine,
+  originalLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const originalMarkup = originalLines.join('\n');
+  const contract = buildPropContract(extractMustacheExpressions(originalMarkup));
+  const originalWithProps = substituteExprsWithProps(originalMarkup, contract);
+
+  const manifest = {
+    id,
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    sourceStartLine,
+    sourceEndLine,
+    count,
+    propContract: contract,
+    originalMarkup,
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildVariantStub(n, originalWithProps, contract), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: contract,
+  };
+}
+
+export function scaffoldSvelteComponentInsertSession({
+  id,
+  count,
+  sourceFile,
+  insertLine,
+  position,
+  anchorStartLine,
+  anchorEndLine,
+  anchorLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const anchorMarkup = (anchorLines || []).join('\n');
+  const manifest = {
+    id,
+    mode: 'insert',
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    insertLine,
+    position,
+    anchorStartLine,
+    anchorEndLine,
+    originalMarkup: anchorMarkup,
+    anchorMarkup,
+    count,
+    propContract: [],
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildInsertVariantStub(n), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: [],
+  };
+}
+
+export function findSvelteComponentManifest(id, cwd = process.cwd()) {
+  const direct = manifestPathForSession(id, cwd);
+  if (fs.existsSync(direct)) {
+    return readManifest(direct);
+  }
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return null;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    const candidate = path.join(root, entry.name, 'manifest.json');
+    if (!fs.existsSync(candidate)) continue;
+    try {
+      const manifest = readManifest(candidate);
+      if (manifest?.id === id) return { ...manifest, manifestPath: candidate };
+    } catch { /* skip */ }
+  }
+  return null;
+}
+
+export function readManifest(manifestPath) {
+  const data = JSON.parse(fs.readFileSync(manifestPath, 'utf-8'));
+  return {
+    ...data,
+    manifestPath,
+  };
+}
+
+export function resolveSourceFile(sourceFile, cwd = process.cwd()) {
+  if (!sourceFile || path.isAbsolute(sourceFile)) {
+    throw new Error('Invalid svelte-component source file');
+  }
+  const full = path.resolve(cwd, sourceFile);
+  const rel = path.relative(cwd, full);
+  if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) {
+    throw new Error('Svelte-component source file escapes project root');
+  }
+  if (!fs.existsSync(full)) {
+    throw new Error('Svelte-component source file not found: ' + sourceFile);
+  }
+  return full;
+}
+
+function appendCssToSvelteStyle(lines, cssLines) {
+  const closeIdx = findLastStyleCloseLine(lines);
+  const prepared = ['', ...cssLines.map((line) => (line.trim() === '' ? '' : '  ' + line.trimStart()))];
+  if (closeIdx === -1) {
+    return [...lines, '', '<style>', ...prepared.slice(1), '</style>'];
+  }
+  return [
+    ...lines.slice(0, closeIdx),
+    ...prepared,
+    ...lines.slice(closeIdx),
+  ];
+}
+
+function findLastStyleCloseLine(lines) {
+  for (let i = lines.length - 1; i >= 0; i--) {
+    if (/<\/style\s*>/.test(lines[i])) return i;
+  }
+  return -1;
+}
+
+function bakeParamValuesInCss(cssLines, paramValues) {
+  if (!paramValues || Object.keys(paramValues).length === 0) return cssLines;
+  return cssLines.map((line) => {
+    let out = line;
+    for (const [key, value] of Object.entries(paramValues)) {
+      const varName = `--p-${key}`;
+      out = out.replace(new RegExp(`var\\(${escapeRegExp(varName)}(?:,\\s*[^)]+)?\\)`, 'g'), String(value));
+    }
+    return out;
+  });
+}
+
+function sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues = null, rootTag = 'div') {
+  const css = String((cssLines || []).join('\n'));
+  if (!/data-impeccable-variant|impeccable-variant-ready/.test(css)) return cssLines;
+
+  const rules = parseCssRules(css);
+  const output = [];
+  for (const rule of rules) {
+    appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag);
+  }
+  return output.join('\n')
+    .split('\n')
+    .map((line) => line.trimEnd())
+    .filter((line) => line.trim() !== '');
+}
+
+function appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag) {
+  const prelude = rule.prelude.trim();
+  const body = rule.body.trim();
+  if (!prelude || !body || /--impeccable-variant-ready\s*:/.test(body)) return;
+
+  if (/^@scope\b/i.test(prelude)) {
+    if (/data-impeccable-variant/.test(prelude) && !selectorHasVariant(prelude, variantNum)) return;
+    const inner = parseCssRules(body);
+    for (const innerRule of inner) {
+      const rewrittenPrelude = rewriteAcceptedSvelteSelector(innerRule.prelude, variantNum, paramValues, rootTag, true);
+      if (!rewrittenPrelude || /--impeccable-variant-ready\s*:/.test(innerRule.body)) continue;
+      output.push(formatCssRule(rewrittenPrelude, innerRule.body.trim()));
+    }
+    return;
+  }
+
+  const rewrittenPrelude = rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, false);
+  if (!rewrittenPrelude) return;
+  output.push(formatCssRule(rewrittenPrelude, body));
+}
+
+function parseCssRules(css) {
+  const rules = [];
+  const text = String(css || '');
+  let i = 0;
+  while (i < text.length) {
+    while (i < text.length && /\s/.test(text[i])) i++;
+    const preludeStart = i;
+    while (i < text.length && text[i] !== '{') i++;
+    if (i >= text.length) break;
+    const prelude = text.slice(preludeStart, i).trim();
+    i++;
+    const bodyStart = i;
+    let depth = 1;
+    let quote = null;
+    let comment = false;
+    while (i < text.length && depth > 0) {
+      const ch = text[i];
+      const next = text[i + 1];
+      if (comment) {
+        if (ch === '*' && next === '/') {
+          comment = false;
+          i += 2;
+          continue;
+        }
+        i++;
+        continue;
+      }
+      if (quote) {
+        if (ch === '\\') {
+          i += 2;
+          continue;
+        }
+        if (ch === quote) quote = null;
+        i++;
+        continue;
+      }
+      if (ch === '/' && next === '*') {
+        comment = true;
+        i += 2;
+        continue;
+      }
+      if (ch === '"' || ch === "'") {
+        quote = ch;
+        i++;
+        continue;
+      }
+      if (ch === '{') depth++;
+      else if (ch === '}') depth--;
+      i++;
+    }
+    const body = text.slice(bodyStart, Math.max(bodyStart, i - 1));
+    if (prelude) rules.push({ prelude, body });
+  }
+  return rules;
+}
+
+function rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, fromScope) {
+  const selectors = splitSelectorList(prelude);
+  const rewritten = [];
+  for (const selector of selectors) {
+    const next = rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope);
+    if (next) rewritten.push(next);
+  }
+  return rewritten.join(', ');
+}
+
+function rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope) {
+  let out = selector.trim();
+  const hasVariant = /data-impeccable-variant/.test(out);
+  if (hasVariant && !selectorHasVariant(out, variantNum)) return '';
+  if (hasVariant) {
+    out = out.replace(variantSelectorRegex(variantNum), '');
+    out = out.replace(/\[data-impeccable-variant=(["']).*?\1\]/g, '');
+  }
+
+  const paramResult = rewriteParamSelectors(out, paramValues);
+  if (!paramResult.keep) return '';
+  out = paramResult.selector;
+
+  out = out
+    .replace(/:scope(?:\[[^\]]+\])?\s*>\s*/g, '')
+    .replace(/:scope(?:\[[^\]]+\])?/g, rootTag || '')
+    .replace(/\s+/g, ' ')
+    .trim();
+
+  out = out.replace(/^[>+~]\s*/, '').trim();
+  if (!out && (hasVariant || fromScope)) return rootTag || ':global(*)';
+  return out;
+}
+
+function rewriteParamSelectors(selector, paramValues) {
+  let keep = true;
+  const next = selector.replace(/\[data-p-([A-Za-z0-9_-]+)(?:=(["'])(.*?)\2)?\]/g, (_match, key, _quote, expected) => {
+    if (!paramValues || !Object.prototype.hasOwnProperty.call(paramValues, key)) return '';
+    const actual = paramValues[key];
+    if (expected != null && String(actual) !== String(expected)) {
+      keep = false;
+      return '';
+    }
+    if (expected == null && (actual === false || actual == null || actual === 'false' || actual === 'off' || actual === '0')) {
+      keep = false;
+      return '';
+    }
+    return '';
+  });
+  return { keep, selector: next };
+}
+
+function splitSelectorList(prelude) {
+  const selectors = [];
+  let start = 0;
+  let bracket = 0;
+  let paren = 0;
+  let quote = null;
+  for (let i = 0; i < prelude.length; i++) {
+    const ch = prelude[i];
+    if (quote) {
+      if (ch === '\\') i++;
+      else if (ch === quote) quote = null;
+      continue;
+    }
+    if (ch === '"' || ch === "'") {
+      quote = ch;
+      continue;
+    }
+    if (ch === '[') bracket++;
+    else if (ch === ']') bracket = Math.max(0, bracket - 1);
+    else if (ch === '(') paren++;
+    else if (ch === ')') paren = Math.max(0, paren - 1);
+    else if (ch === ',' && bracket === 0 && paren === 0) {
+      selectors.push(prelude.slice(start, i));
+      start = i + 1;
+    }
+  }
+  selectors.push(prelude.slice(start));
+  return selectors;
+}
+
+function selectorHasVariant(selector, variantNum) {
+  return variantSelectorRegex(variantNum).test(selector);
+}
+
+function variantSelectorRegex(variantNum) {
+  return new RegExp(`\\[data-impeccable-variant=(["'])${escapeRegExp(String(variantNum))}\\1\\]`, 'g');
+}
+
+function formatCssRule(selector, body) {
+  return `${selector} { ${body.trim()} }`;
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+export function inlineSvelteComponentAccept(manifest, variantNum, paramValues = null, cwd = process.cwd()) {
+  const sourceFile = resolveSourceFile(manifest.sourceFile, cwd);
+  const variantPath = path.join(cwd, manifest.componentDir, `v${variantNum}.svelte`);
+  const resultBase = {
+    file: manifest.sourceFile,
+    sourceFile: manifest.sourceFile,
+    previewMode: 'svelte-component',
+    componentDir: manifest.componentDir,
+    carbonize: false,
+  };
+  if (!fs.existsSync(variantPath)) {
+    return { handled: false, error: `Variant ${variantNum} not found`, ...resultBase };
+  }
+
+  const { markup, cssLines } = parseSvelteComponentFile(fs.readFileSync(variantPath, 'utf-8'));
+  if (manifest.mode === 'insert') {
+    return inlineSvelteComponentInsertAccept({
+      manifest,
+      markup,
+      cssLines,
+      variantNum,
+      paramValues,
+      sourceFile,
+      resultBase,
+      cwd,
+    });
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const contract = manifest.propContract || [];
+  const mergedMarkup = mergeOriginalTopLevelAttrs(markup, manifest.originalMarkup || '');
+  const restoredMarkup = substitutePropsWithExprs(mergedMarkup, contract)
+    .split('\n')
+    .map((line) => line.trimEnd());
+
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const start = Number(manifest.sourceStartLine) - 1;
+  const end = Number(manifest.sourceEndLine) - 1;
+  if (!Number.isInteger(start) || !Number.isInteger(end) || start < 0 || end < start || end >= sourceLines.length) {
+    return { handled: false, error: 'Invalid source line range for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const indent = sourceLines[start].match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, start),
+    ...indentedMarkup,
+    ...sourceLines.slice(end + 1),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function inlineSvelteComponentInsertAccept({
+  manifest,
+  markup,
+  cssLines,
+  variantNum,
+  paramValues,
+  sourceFile,
+  resultBase,
+  cwd,
+}) {
+  if (!svelteMarkupHasVisibleContent(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant is empty', ...resultBase };
+  }
+  if (/\bdata-impeccable-[\w-]*\s*=/.test(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant contains preview-only data-impeccable attributes', ...resultBase };
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const restoredMarkup = String(markup || '')
+    .split('\n')
+    .map((line) => line.trimEnd());
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const insertIndex = Number(manifest.insertLine) - 1;
+  if (!Number.isInteger(insertIndex) || insertIndex < 0 || insertIndex > sourceLines.length) {
+    return { handled: false, error: 'Invalid insert line for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const nearbyLine = sourceLines[insertIndex] ?? sourceLines[insertIndex - 1] ?? '';
+  const indent = nearbyLine.match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, insertIndex),
+    ...indentedMarkup,
+    ...sourceLines.slice(insertIndex),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function svelteMarkupHasVisibleContent(markup) {
+  const text = String(markup || '')
+    .replace(/<script[\s\S]*?<\/script>/gi, '')
+    .replace(/<style[\s\S]*?<\/style>/gi, '')
+    .replace(/<!--[\s\S]*?-->/g, '')
+    .replace(/<[^>]+>/g, ' ')
+    .replace(/\s+/g, ' ')
+    .trim();
+  if (text.length > 0) return true;
+  return /<(img|svg|canvas|video|audio|picture|input|button|select|textarea)\b/i.test(markup || '');
+}
+
+function mergeOriginalTopLevelAttrs(markup, originalMarkup) {
+  const variantOpen = matchOpeningTag(markup);
+  const originalOpen = matchOpeningTag(originalMarkup);
+  if (!variantOpen || !originalOpen) return markup;
+  if (variantOpen.tag.toLowerCase() !== originalOpen.tag.toLowerCase()) return markup;
+
+  const variantAttrs = parseAttrSegments(variantOpen.attrs);
+  const originalAttrs = parseAttrSegments(originalOpen.attrs);
+  const additions = [];
+  let attrs = variantOpen.attrs;
+
+  const originalClass = originalAttrs.get('class');
+  const variantClass = variantAttrs.get('class');
+  if (originalClass && variantClass) {
+    const merged = mergeStaticClassAttr(originalClass, variantClass);
+    if (merged) {
+      attrs = attrs.slice(0, variantClass.start) + merged + attrs.slice(variantClass.end);
+      variantAttrs.set('class', { ...variantClass, raw: merged });
+    }
+  } else if (originalClass && !variantClass) {
+    additions.push(originalClass.raw);
+  }
+
+  for (const [name, attr] of originalAttrs) {
+    if (name === 'class') continue;
+    if (!variantAttrs.has(name)) additions.push(attr.raw);
+  }
+
+  if (additions.length === 0 && attrs === variantOpen.attrs) return markup;
+  const nextOpen = variantOpen.prefix
+    + variantOpen.tag
+    + attrs
+    + additions.map((attr) => ' ' + attr.trim()).join('')
+    + variantOpen.close;
+  return markup.slice(0, variantOpen.index) + nextOpen + markup.slice(variantOpen.index + variantOpen.raw.length);
+}
+
+function matchOpeningTag(markup) {
+  const match = String(markup || '').match(/^(\s*<)([A-Za-z][\w:-]*)([^>]*?)(\/?>)/);
+  if (!match) return null;
+  return {
+    raw: match[0],
+    prefix: match[1],
+    tag: match[2],
+    attrs: match[3] || '',
+    close: match[4],
+    index: match.index || 0,
+  };
+}
+
+function parseAttrSegments(attrs) {
+  const out = new Map();
+  const re = /([A-Za-z_:][\w:.-]*)(?:\s*=\s*(?:"[^"]*"|'[^']*'|\{[^}]*\}|[^\s"'>=]+))?/g;
+  let match;
+  while ((match = re.exec(attrs))) {
+    const raw = match[0];
+    const name = match[1];
+    out.set(name, {
+      name,
+      raw,
+      start: match.index,
+      end: match.index + raw.length,
+    });
+  }
+  return out;
+}
+
+function mergeStaticClassAttr(originalClass, variantClass) {
+  const originalValue = originalClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  const variantValue = variantClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  if (!originalValue || !variantValue) return null;
+  const quote = variantValue[1];
+  const classes = [
+    ...variantValue[2].split(/\s+/),
+    ...originalValue[2].split(/\s+/),
+  ].filter(Boolean);
+  return `class=${quote}${[...new Set(classes)].join(' ')}${quote}`;
+}
+
+export function removeSvelteComponentSession(id, cwd = process.cwd()) {
+  const dir = componentSessionDir(id, cwd);
+  try {
+    fs.rmSync(dir, { recursive: true, force: true });
+  } catch { /* non-fatal */ }
+}
+
+export function removeAllSvelteComponentSessions(cwd = process.cwd()) {
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    if (entry.name.startsWith('__')) continue;
+    try {
+      fs.rmSync(path.join(root, entry.name), { recursive: true, force: true });
+    } catch { /* non-fatal */ }
+  }
+}
+
+export function deferredAcceptsPath(cwd = process.cwd()) {
+  const key = createHash('sha1').update(path.resolve(cwd)).digest('hex').slice(0, 16);
+  return path.join(os.tmpdir(), 'impeccable-live', key, 'deferred-svelte-component-accepts.json');
+}
+
+export function readDeferredAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  try {
+    return JSON.parse(fs.readFileSync(file, 'utf-8'));
+  } catch {
+    return { accepts: [] };
+  }
+}
+
+export function writeDeferredAccept(entry, cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  const data = readDeferredAccepts(cwd);
+  data.accepts = (data.accepts || []).filter((item) => item.id !== entry.id);
+  data.accepts.push({ ...entry, createdAt: new Date().toISOString() });
+  fs.writeFileSync(file, JSON.stringify(data, null, 2) + '\n', 'utf-8');
+}
+
+export function applyDeferredSvelteComponentAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  const data = readDeferredAccepts(cwd);
+  const pending = Array.isArray(data.accepts) ? data.accepts : [];
+  const results = [];
+  const remaining = [];
+  for (const entry of pending) {
+    try {
+      const manifest = findSvelteComponentManifest(entry.id, cwd);
+      if (!manifest) {
+        results.push({ id: entry.id, ok: false, error: 'manifest not found' });
+        remaining.push(entry);
+        continue;
+      }
+      const result = inlineSvelteComponentAccept(
+        manifest,
+        entry.variantNum,
+        entry.paramValues || null,
+        cwd,
+      );
+      results.push({ id: entry.id, ok: result.handled !== false, result });
+      if (result.handled === false) remaining.push(entry);
+    } catch (err) {
+      results.push({ id: entry.id, ok: false, error: err.message });
+      remaining.push(entry);
+    }
+  }
+  if (remaining.length > 0) {
+    fs.writeFileSync(file, JSON.stringify({ accepts: remaining }, null, 2) + '\n', 'utf-8');
+  } else {
+    try { fs.rmSync(file, { force: true }); } catch {}
+  }
+  return { applied: results.filter((r) => r.ok).length, failed: results.filter((r) => !r.ok).length, results };
+}
+
+export function buildSvelteComponentCssAuthoring(count) {
+  const variantNumbers = Array.from({ length: count }, (_, i) => i + 1);
+  return {
+    mode: 'svelte-component',
+    styleTag: null,
+    strategy: 'component-style-block',
+    rulePattern: '.semantic-class { ... }',
+    selectorExamples: variantNumbers.map(() => '.expense-row { padding: 22px; }'),
+    requirements: [
+      'Write each variant as a real Svelte component file (v1.svelte, v2.svelte, ...).',
+      'Keep the prop names from propContract; bind dynamic text with {propName}, not literal snapshot text.',
+      'Put variant CSS in the component <style> block using semantic class selectors.',
+      'Author param-driven CSS against var(--p-<id>, default) and [data-p-<id>] using :global(...) so the runtime knob values reach the mounted root.',
+      'Declare params in componentDir/params.json keyed by variant number (e.g. {"1": [...], "2": [...]}), NOT as a data-impeccable-params attribute.',
+      'Do not use @scope or data-impeccable-variant selectors in component files.',
+      'Do not edit the route source file during generation; only edit files under componentDir.',
+    ],
+    forbidden: [
+      'Do not use @scope blocks in Svelte component variants.',
+      'Do not copy live DOM snapshot text into markup when propContract provides bindings.',
+      'Do not add data-impeccable-* attributes inside component files. Svelte parses { in attribute values as an expression, so data-impeccable-params with JSON breaks the build; use componentDir/params.json instead.',
+    ],
+    paramsFile: 'params.json',
+  };
+}

.agents/skills/impeccable/scripts/live-sveltekit-adapter.mjs

@@ -0,0 +1,274 @@
+/**
+ * SvelteKit live-mode adapter.
+ *
+ * SvelteKit must not be patched through src/app.html. That file is a document
+ * template, not framework-owned component chrome. The adapter keeps SvelteKit
+ * work limited to mounting a dev-only shadow host from +layout.svelte; the
+ * actual live UI remains the shared plain-DOM browser chrome.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+
+export const SVELTE_LIVE_ROOT_COMPONENT = 'src/lib/impeccable/ImpeccableLiveRoot.svelte';
+export const SVELTE_LAYOUT_MARKER_OPEN = '<!-- impeccable-live-svelte-start -->';
+export const SVELTE_LAYOUT_MARKER_CLOSE = '<!-- impeccable-live-svelte-end -->';
+export const SVELTE_ROOT_IMPORT = "import ImpeccableLiveRoot from '$lib/impeccable/ImpeccableLiveRoot.svelte';";
+
+export function detectSvelteKitProject(cwd = process.cwd(), config = null) {
+  const appHtml = findSvelteKitAppHtml(cwd, config);
+  if (!appHtml) return null;
+  const hasTemplateMarkers = fileIncludes(path.join(cwd, appHtml), '%sveltekit.body%')
+    && fileIncludes(path.join(cwd, appHtml), '%sveltekit.head%');
+  if (!hasTemplateMarkers) return null;
+
+  const hasSvelteConfig = fs.existsSync(path.join(cwd, 'svelte.config.js'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.mjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.cjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.ts'));
+  const hasKitPackage = packageHasSvelteKit(cwd);
+  if (!hasSvelteConfig && !hasKitPackage) return null;
+
+  return {
+    appHtml,
+    layoutFile: findSvelteKitLayout(cwd),
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function applySvelteKitLiveAdapter({ cwd = process.cwd(), port, config = null } = {}) {
+  if (!Number.isFinite(Number(port))) {
+    throw new Error('SvelteKit live adapter requires a numeric port');
+  }
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  ensureSvelteLiveRootComponent(cwd, Number(port));
+
+  const layoutRel = detected.layoutFile;
+  const layoutAbs = path.join(cwd, layoutRel);
+  fs.mkdirSync(path.dirname(layoutAbs), { recursive: true });
+  const layoutExisted = fs.existsSync(layoutAbs);
+  const before = layoutExisted ? fs.readFileSync(layoutAbs, 'utf-8') : defaultSvelteLayout();
+  const after = patchSvelteLayout(before);
+  fs.writeFileSync(layoutAbs, after, 'utf-8');
+
+  return {
+    file: layoutRel,
+    adapter: 'sveltekit',
+    inserted: after !== before || !layoutExisted,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function removeSvelteKitLiveAdapter({ cwd = process.cwd(), config = null } = {}) {
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  const layoutAbs = path.join(cwd, detected.layoutFile);
+  let removed = false;
+  if (fs.existsSync(layoutAbs)) {
+    const before = fs.readFileSync(layoutAbs, 'utf-8');
+    const after = unpatchSvelteLayout(before);
+    if (after !== before) {
+      fs.writeFileSync(layoutAbs, after, 'utf-8');
+      removed = true;
+    }
+  }
+
+  const rootAbs = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  if (fs.existsSync(rootAbs)) {
+    fs.rmSync(rootAbs, { force: true });
+    removed = true;
+  }
+
+  pruneEmptyDir(path.dirname(rootAbs), path.join(cwd, 'src'));
+
+  return {
+    file: detected.layoutFile,
+    adapter: 'sveltekit',
+    removed,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function patchSvelteLayout(content) {
+  let out = String(content || '');
+  if (!out.includes(SVELTE_ROOT_IMPORT)) {
+    const scriptMatch = out.match(/<script(?:\s[^>]*)?>/i);
+    if (scriptMatch) {
+      const insertAt = scriptMatch.index + scriptMatch[0].length;
+      out = out.slice(0, insertAt) + '\n  ' + SVELTE_ROOT_IMPORT + out.slice(insertAt);
+    } else {
+      out = `<script>\n  ${SVELTE_ROOT_IMPORT}\n</script>\n\n` + out;
+    }
+  }
+
+  if (!out.includes(SVELTE_LAYOUT_MARKER_OPEN)) {
+    const block = `${SVELTE_LAYOUT_MARKER_OPEN}\n<ImpeccableLiveRoot />\n${SVELTE_LAYOUT_MARKER_CLOSE}\n`;
+    const renderMatch = out.match(/\{@render\s+children(?:\?\.)?\(\)\s*\}/);
+    const slotMatch = out.match(/<slot\s*\/?>/);
+    const match = renderMatch || slotMatch;
+    if (match) {
+      out = out.slice(0, match.index) + block + out.slice(match.index);
+    } else {
+      out = out.replace(/\s*$/, '\n\n' + block);
+    }
+  }
+
+  return out;
+}
+
+export function unpatchSvelteLayout(content) {
+  let out = String(content || '');
+  const blockRe = new RegExp(
+    '([ \\t]*)' + escapeRegExp(SVELTE_LAYOUT_MARKER_OPEN)
+    + '\\n<ImpeccableLiveRoot\\s*/>\\n'
+    + escapeRegExp(SVELTE_LAYOUT_MARKER_CLOSE)
+    + '\\n?',
+    'g',
+  );
+  out = out.replace(blockRe, '$1');
+  out = out.replace(new RegExp('^\\s*' + escapeRegExp(SVELTE_ROOT_IMPORT) + '\\s*\\n?', 'gm'), '');
+  out = out.replace(/<script>\s*<\/script>\s*\n?/g, '');
+  return out.replace(/\n{3,}/g, '\n\n');
+}
+
+export function ensureSvelteLiveRootComponent(cwd, port) {
+  const file = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, buildSvelteLiveRootComponent(port), 'utf-8');
+  return file;
+}
+
+export function buildSvelteLiveRootComponent(port) {
+  return `<script>
+  import { onMount } from 'svelte';
+
+  const LIVE_URL = 'http://localhost:${Number(port)}/live.js';
+  const HOST_ID = 'impeccable-live-root';
+
+  onMount(() => {
+    let host = document.querySelector('impeccable-live-root#' + HOST_ID) || document.getElementById(HOST_ID);
+    if (!host) {
+      host = document.createElement('impeccable-live-root');
+      host.id = HOST_ID;
+      document.body.appendChild(host);
+    }
+
+    host.dataset.impeccableLiveAdapter = 'sveltekit';
+    host.style.setProperty('all', 'initial', 'important');
+    host.style.setProperty('display', 'block', 'important');
+    host.style.setProperty('position', 'fixed', 'important');
+    host.style.setProperty('top', '0', 'important');
+    host.style.setProperty('left', '0', 'important');
+    host.style.setProperty('width', '0', 'important');
+    host.style.setProperty('height', '0', 'important');
+    host.style.setProperty('overflow', 'visible', 'important');
+    host.style.setProperty('z-index', '2147483000', 'important');
+    host.style.setProperty('pointer-events', 'none', 'important');
+
+    const root = host.shadowRoot || host.attachShadow({ mode: 'open' });
+    if (!root.querySelector('style[data-impeccable-live-reset]')) {
+      const reset = document.createElement('style');
+      reset.dataset.impeccableLiveReset = 'true';
+      reset.textContent = ':host, :host *, * { box-sizing: border-box; }';
+      root.appendChild(reset);
+    }
+
+    window.__IMPECCABLE_LIVE_ADAPTER__ = 'sveltekit';
+    window.__IMPECCABLE_LIVE_UI_ROOT__ = root;
+    window.__IMPECCABLE_LIVE_CHROME_MOUNT__ = {
+      adapter: 'sveltekit',
+      version: 1,
+      host,
+      root,
+    };
+
+    const script = document.createElement('script');
+    script.src = LIVE_URL;
+    script.async = true;
+    script.dataset.impeccableLiveScript = 'true';
+    document.head.appendChild(script);
+
+    return () => {
+      script.remove();
+      if (window.__IMPECCABLE_LIVE_UI_ROOT__ === root) delete window.__IMPECCABLE_LIVE_UI_ROOT__;
+      if (window.__IMPECCABLE_LIVE_CHROME_MOUNT__?.root === root) delete window.__IMPECCABLE_LIVE_CHROME_MOUNT__;
+      if (window.__IMPECCABLE_LIVE_ADAPTER__ === 'sveltekit') delete window.__IMPECCABLE_LIVE_ADAPTER__;
+    };
+  });
+</script>
+`;
+}
+
+function findSvelteKitAppHtml(cwd, config) {
+  const files = Array.isArray(config?.files) ? config.files : ['src/app.html'];
+  for (const rel of files) {
+    if (rel.includes('*')) continue;
+    const normalized = rel.split(path.sep).join('/');
+    if (!normalized.endsWith('app.html')) continue;
+    const abs = path.join(cwd, normalized);
+    if (fs.existsSync(abs)) return normalized;
+  }
+  const fallback = 'src/app.html';
+  return fs.existsSync(path.join(cwd, fallback)) ? fallback : null;
+}
+
+function findSvelteKitLayout(cwd) {
+  const candidates = [
+    'src/routes/+layout.svelte',
+    'src/routes/(app)/+layout.svelte',
+  ];
+  for (const rel of candidates) {
+    if (fs.existsSync(path.join(cwd, rel))) return rel;
+  }
+  return 'src/routes/+layout.svelte';
+}
+
+function defaultSvelteLayout() {
+  return `<script>\n  let { children } = $props();\n</script>\n\n{@render children?.()}\n`;
+}
+
+function packageHasSvelteKit(cwd) {
+  const file = path.join(cwd, 'package.json');
+  if (!fs.existsSync(file)) return false;
+  try {
+    const pkg = JSON.parse(fs.readFileSync(file, 'utf-8'));
+    const deps = {
+      ...(pkg.dependencies || {}),
+      ...(pkg.devDependencies || {}),
+      ...(pkg.peerDependencies || {}),
+    };
+    return Boolean(deps['@sveltejs/kit'] || deps['@sveltejs/vite-plugin-svelte'] || deps.svelte);
+  } catch {
+    return false;
+  }
+}
+
+function fileIncludes(file, text) {
+  try {
+    return fs.readFileSync(file, 'utf-8').includes(text);
+  } catch {
+    return false;
+  }
+}
+
+function pruneEmptyDir(dir, stopDir) {
+  let current = dir;
+  while (current.startsWith(stopDir) && current !== stopDir) {
+    try {
+      if (fs.readdirSync(current).length > 0) return;
+      fs.rmdirSync(current);
+      current = path.dirname(current);
+    } catch {
+      return;
+    }
+  }
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}

.agents/skills/impeccable/scripts/live-ui-core.mjs

@@ -0,0 +1,179 @@
+/**
+ * Framework-neutral Impeccable live chrome contract.
+ *
+ * The production browser bundle is intentionally plain DOM so Svelte, React,
+ * Vue, and static adapters can all mount the same chrome. This module is the
+ * testable contract/inventory for that bundle; live-browser.js mirrors these
+ * values at runtime because it is served as a standalone script.
+ */
+
+export const LIVE_CHROME_MOUNT_CONTRACT = Object.freeze([
+  'root',
+  'transport',
+  'state',
+  'actions',
+]);
+
+export const LIVE_UI_SURFACES = Object.freeze([
+  {
+    key: 'global-bottom-bar',
+    ids: [
+      'impeccable-live-global-bar',
+      'impeccable-live-global-bar-brand',
+      'impeccable-live-pick-toggle',
+      'impeccable-live-insert-toggle',
+      'impeccable-live-detect-toggle',
+      'impeccable-live-detect-badge',
+      'impeccable-live-design-toggle',
+      'impeccable-live-page-chat',
+      'impeccable-live-page-chat-input',
+      'impeccable-live-page-chat-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'active', 'tooltip'],
+  },
+  {
+    key: 'pending-copy-edit-dock',
+    ids: ['impeccable-live-pending-dock'],
+    states: ['closed', 'open', 'hover', 'pressed', 'loading', 'rollback', 'keep-fixing'],
+  },
+  {
+    key: 'element-selection-chrome',
+    ids: [
+      'impeccable-live-highlight',
+      'impeccable-live-tooltip',
+      'impeccable-live-bar',
+      'impeccable-live-configure-input-wrap',
+      'impeccable-live-input',
+      'impeccable-live-configure-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'disabled'],
+  },
+  {
+    key: 'action-picker',
+    ids: ['impeccable-live-picker'],
+    states: ['closed', 'open', 'option-hover', 'option-focus'],
+  },
+  {
+    key: 'edit-chrome',
+    ids: ['impeccable-live-edit-badge'],
+    states: ['enabled', 'disabled', 'editing', 'cancel', 'save', 'edited-content'],
+  },
+  {
+    key: 'generating-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-shader'],
+    states: ['action-label', 'animated-dots', 'generating', 'done'],
+  },
+  {
+    key: 'variant-cycling-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-params-panel'],
+    states: ['variant-1', 'variant-2', 'variant-3', 'left-disabled', 'right-disabled', 'dot-click', 'accept', 'discard'],
+  },
+  {
+    key: 'variant-params-panel',
+    ids: ['impeccable-live-params-panel'],
+    states: ['closed', 'open-above', 'open-below', 'range', 'steps', 'toggle'],
+  },
+  {
+    key: 'saving-confirmed-rows',
+    ids: ['impeccable-live-bar'],
+    states: ['saving', 'applying-variant', 'confirmed'],
+  },
+  {
+    key: 'insert-mode-chrome',
+    ids: [
+      'impeccable-live-insert-line',
+      'impeccable-live-insert-placeholder',
+      'impeccable-live-placeholder-resize',
+      'impeccable-live-insert-input',
+      'impeccable-live-insert-voice',
+      'impeccable-live-insert-create',
+      'impeccable-live-insert-create-tooltip',
+    ],
+    states: ['toggle-active', 'line', 'placeholder', 'resize', 'enabled', 'disabled', 'tooltip'],
+  },
+  {
+    key: 'annotation-chrome',
+    ids: [
+      'impeccable-live-annot',
+      'impeccable-live-annot-svg',
+      'impeccable-live-annot-pins',
+      'impeccable-live-annot-clear',
+    ],
+    states: ['overlay', 'drawing', 'pin', 'pin-edit', 'clear'],
+  },
+  {
+    key: 'design-system-panel',
+    ids: ['impeccable-live-design-host'],
+    states: ['closed', 'open', 'tabs', 'token-tiles', 'copy'],
+  },
+  {
+    key: 'toasts-and-errors',
+    ids: ['impeccable-live-toast'],
+    states: ['normal', 'error', 'no-variants-mounted'],
+  },
+  {
+    key: 'css-isolation-boundary',
+    ids: ['impeccable-live-root'],
+    states: ['shadow-root', 'style-tags', 'hostile-css'],
+  },
+]);
+
+export const LIVE_UI_COMPONENT_IDS = Object.freeze([
+  ...new Set(LIVE_UI_SURFACES.flatMap((surface) => surface.ids)),
+]);
+
+export function resolveLiveUiRoot(env = globalThis) {
+  const doc = env?.document;
+  const explicit = env?.__IMPECCABLE_LIVE_UI_ROOT__
+    || env?.window?.__IMPECCABLE_LIVE_UI_ROOT__;
+  if (explicit && typeof explicit.appendChild === 'function') return explicit;
+  return doc?.body || null;
+}
+
+export function getLiveUiElementById(id, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (!id) return null;
+  if (root?.getElementById) {
+    const found = root.getElementById(id);
+    if (found) return found;
+  }
+  if (root?.querySelector) {
+    const found = root.querySelector('#' + escapeCssIdent(id));
+    if (found) return found;
+  }
+  return doc?.getElementById?.(id) || null;
+}
+
+export function appendToLiveUiRoot(el, env = globalThis) {
+  const root = resolveLiveUiRoot(env);
+  if (!root) throw new Error('Impeccable live UI root is not available');
+  root.appendChild(el);
+  return el;
+}
+
+export function appendStyleToLiveUiRoot(styleEl, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (root && root !== doc?.body) {
+    root.appendChild(styleEl);
+  } else {
+    (doc?.head || doc?.body || root).appendChild(styleEl);
+  }
+  return styleEl;
+}
+
+export function activeElementDeep(doc = globalThis.document) {
+  let active = doc?.activeElement || null;
+  while (active?.shadowRoot?.activeElement) {
+    active = active.shadowRoot.activeElement;
+  }
+  return active;
+}
+
+function escapeCssIdent(value) {
+  if (typeof CSS !== 'undefined' && typeof CSS.escape === 'function') {
+    return CSS.escape(String(value));
+  }
+  return String(value).replace(/([ !"#$%&'()*+,./:;<=>?@[\\\]^`{|}~])/g, '\\$1');
+}

.agents/skills/impeccable/scripts/live-wrap.mjs

@@ -15,6 +15,11 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -262,6 +267,8 @@ The agent should insert variant HTML at insertLine.`);
     .map((l) => (l.trim() === '' ? '' : indent + extra + l.slice(originalBaseIndent)))
     .join('\n');
   const originalIndented = reindentOriginal('    ');
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+  const useSvelteComponent = shouldUseSvelteComponentInjection(targetFile);
 
   // Wrapper attributes differ by syntax. HTML allows plain string attrs;
   // JSX requires object-literal style and parses string attrs as HTML (which
@@ -302,38 +309,75 @@ The agent should insert variant HTML at insertLine.`);
     indent + commentSyntax.open + ' impeccable-variants-end ' + id + ' ' + commentSyntax.close,
   ];
 
-  // Replace the original element with the wrapper
+  let outputFile = targetFile;
-  const newLines = [
+  let outputLines;
-    ...lines.slice(0, startLine),
+  let outputStartLine = startLine + 1;
-    ...wrapperLines,
+  let outputEndLine = startLine + wrapperLines.length + (originalLines.length - 1);
-    ...lines.slice(endLine + 1),
+  let insertLine;
-  ];
+  let svelteSession = null;
-  fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
 
-  // Calculate insert line (the "insert below this line" comment).
+  if (useSvelteComponent) {
-  // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // Svelte/SvelteKit resets component-local state on markup HMR updates.
-  // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // Keep generation source-neutral: agents write real variant components
-  // original-div + content + close-original-div; JSX: outer-div +
+    // under the generated componentDir, the browser mounts them into the live
-  // start-comment + Original-comment + original-div + content +
+    // DOM, and live-accept.mjs inlines the accepted variant back into the route.
-  // close-original-div). Multi-line originals push the marker by their
+    svelteSession = scaffoldSvelteComponentSession({
-  // extra line count.
+      id,
-  const insertLine = startLine + 6 + (originalLines.length - 1);
+      count,
+      sourceFile: relTargetFile,
+      sourceStartLine: startLine + 1,
+      sourceEndLine: endLine + 1,
+      originalLines,
+      cwd: process.cwd(),
+    });
+    outputFile = path.resolve(process.cwd(), svelteSession.manifestFile);
+    outputStartLine = 1;
+    outputEndLine = 1;
+    insertLine = 1;
+  } else {
+    // Replace the original element with the wrapper
+    const newLines = [
+      ...lines.slice(0, startLine),
+      ...wrapperLines,
+      ...lines.slice(endLine + 1),
+    ];
+    fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
+
+    // Calculate insert line (the "insert below this line" comment).
+    // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // original-div + content + close-original-div; JSX: outer-div +
+    // start-comment + Original-comment + original-div + content +
+    // close-original-div). Multi-line originals push the marker by their
+    // extra line count.
+    insertLine = startLine + 6 + (originalLines.length - 1) + 1;
+  }
+
+  const outputRelFile = path.relative(process.cwd(), outputFile).split(path.sep).join('/');
+
+  const svelteComponentAuthoring = useSvelteComponent ? buildSvelteComponentCssAuthoring(count) : null;
 
   console.log(JSON.stringify({
-    file: path.relative(process.cwd(), targetFile),
+    file: outputRelFile,
-    startLine: startLine + 1,       // 1-indexed for the agent
+    sourceFile: useSvelteComponent ? relTargetFile : undefined,
+    previewMode: useSvelteComponent ? 'svelte-component' : undefined,
+    componentDir: svelteSession?.componentDir,
+    propContract: svelteSession?.propContract,
+    sourceStartLine: useSvelteComponent ? startLine + 1 : undefined,
+    sourceEndLine: useSvelteComponent ? endLine + 1 : undefined,
+    startLine: outputStartLine,       // 1-indexed for the agent
     // wrapperLines is an array but one element (the original-content slot)
     // is a `\n`-joined multi-line string, so the actual file-row count is
     // wrapperLines.length + (originalLines.length - 1). Without the offset,
     // endLine pointed inside the wrapper for any picked element that
     // spanned more than one source line.
-    endLine: startLine + wrapperLines.length + (originalLines.length - 1), // 1-indexed
+    endLine: outputEndLine, // 1-indexed
-    insertLine: insertLine + 1,     // 1-indexed: where variants go
+    insertLine,            // 1-indexed: where variants go
     commentSyntax: commentSyntax,
-    styleMode: styleMode.mode,
+    styleMode: useSvelteComponent ? 'svelte-component' : styleMode.mode,
-    styleTag: styleMode.styleTag,
+    styleTag: useSvelteComponent ? null : styleMode.styleTag,
-    cssSelectorPrefixExamples: buildCssSelectorPrefixExamples(styleMode.mode, count),
+    cssSelectorPrefixExamples: useSvelteComponent ? [] : buildCssSelectorPrefixExamples(styleMode.mode, count),
-    cssAuthoring: buildCssAuthoring(styleMode, count),
+    cssAuthoring: useSvelteComponent ? svelteComponentAuthoring : buildCssAuthoring(styleMode, count),
     originalLineCount: originalLines.length,
   }));
 }
@@ -527,6 +571,14 @@ function splitClassList(classes) {
   return String(classes).split(/[,\s]+/).map(c => c.trim()).filter(Boolean);
 }
 
+function attrEscapeDouble(str) {
+  return String(str)
+    .replace(/&/g, '&')
+    .replace(/"/g, '"')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;');
+}
+
 function detectCommentSyntax(filePath) {
   const ext = path.extname(filePath).toLowerCase();
   if (ext === '.jsx' || ext === '.tsx') {

.claude/skills/impeccable/reference/live.md

@@ -111,7 +111,9 @@ node .claude/skills/impeccable/scripts/live-insert.mjs --id EVENT_ID --count EVE
 
 The scaffold has **no** `data-impeccable-variant="original"`. Variants are net-new HTML+CSS inserted at `insertLine`. Load `brand.md` or `product.md` (freeform only, no action sub-command). Write all variants in one edit, then `--reply done`.
 
-On accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
+For Svelte/SvelteKit targets, `live-insert.mjs` returns `previewMode: "svelte-component"` with `mode: "insert"`, `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each inserted variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`. Insert variants must be non-empty net-new content with a single top-level root, no `data-impeccable-*` attributes, and CSS in each component's `<style>` block. Do **not** edit the route source during generation; the browser mounts the temporary component before/after the live anchor while the user cycles variants. On Accept, `live-accept.mjs` inserts the selected component markup into `sourceFile` immediately and deletes the temp session after the source write succeeds.
+
+For non-Svelte targets, on accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
 
 ### Replace mode (default)
 
@@ -149,6 +151,25 @@ If `--text` matches multiple candidates equally well, wrap exits with `{ error:
 
 Output on success: `{ file, insertLine, commentSyntax, styleMode, styleTag, cssSelectorPrefixExamples, cssAuthoring }`.
 
+For Svelte/SvelteKit targets, `live-wrap.mjs` returns `previewMode: "svelte-component"` with `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`; use the `propContract` prop names for dynamic text (`{propName}`), not literal snapshot strings. Put variant CSS in each component's `<style>` block with semantic class selectors (no `@scope`, no `data-impeccable-*`). Reply with `--file` set to the manifest path; the browser dynamically imports and mounts the compiled components so Svelte HMR does not reset page state while the user cycles variants. On Accept, `live-accept.mjs` inlines the accepted component back into `sourceFile` immediately after source promotion succeeds.
+
+**Params on the Svelte component path go in a sidecar, never as an attribute.** Svelte parses `{` inside an attribute value as the start of an expression, so a `data-impeccable-params='[{…}]'` attribute on a component element fails to compile (`Expected token }`). Declare params for this path in `componentDir/params.json`, keyed by variant number, using the exact param schema from section 7:
+
+```json
+{
+  "1": [
+    {"id":"density","kind":"steps","default":"snug","label":"Density","options":[
+      {"value":"airy","label":"Airy"},{"value":"snug","label":"Snug"},{"value":"packed","label":"Packed"}
+    ]}
+  ],
+  "2": [
+    {"id":"accent","kind":"range","min":0,"max":1,"step":0.05,"default":0.5,"label":"Accent"}
+  ]
+}
+```
+
+Author the component `<style>` against `var(--p-<id>, default)` for `range`/`toggle` and `[data-p-<id>="…"]` for `steps`; wrap those selectors in `:global(...)` so the knob values the runtime sets on the mounted root reach your rules. The browser reads `params.json`, docks the panel, and drives `--p-*` / `data-p-*` on the mounted component exactly as it does for the HTML/JSX path.
+
 `styleMode` controls how preview CSS must be authored. Treat it as a detected capability mode, not a framework guess:
 
 - `scoped`: use `@scope ([data-impeccable-variant="N"])` rules.
@@ -340,7 +361,7 @@ Each variant can expose **coarse** knobs alongside the full HTML/CSS replacement
 
 **Hard cap per variant**: at most **four** parameters so the panel stays legible; rare fifth only if the reference explicitly allows it.
 
-**How to declare.** Put a JSON manifest on the variant wrapper:
+**How to declare.** Put a JSON manifest on the variant wrapper (HTML/JSX path). **On the Svelte `svelte-component` path, do not use this attribute** (Svelte can't compile `{` inside an attribute value). Declare params in `componentDir/params.json` keyed by variant number instead (see the Svelte component paragraph in the wrap section). The param schema below is identical for both paths.
 
 ```html
 <div data-impeccable-variant="1" data-impeccable-params='[
@@ -454,7 +475,7 @@ Do these five steps in the current thread, synchronously, before the next poll.
 1. **Locate the carbonize block** in the source file (`_acceptResult.file`). It's bracketed by `<!-- impeccable-carbonize-start SESSION_ID -->` and `<!-- impeccable-carbonize-end SESSION_ID -->` and contains a `<style data-impeccable-css="SESSION_ID">` element. If the variant declared parameters, an `<!-- impeccable-param-values SESSION_ID: {...} -->` comment sits alongside the style tag with the user's chosen values; read it first; it drives steps 3 and 4 below.
 2. **Move the CSS rules** into the project's real stylesheet. Which stylesheet depends on the project (e.g. `site/styles/workflow.css` for an Astro project, or the component's co-located CSS file for a Vite/Next project; pick whichever already owns styling for the surrounding element).
 3. **Bake in parameter values while rewriting selectors.** For `@scope ([data-impeccable-variant="N"])` wrappers: retarget to real, semantic classes on the accepted HTML (`.why-visual--v2 .v2-label { … }`). For `:scope[data-p-<id>="VALUE"]` selectors: keep only the branch matching the chosen value from the param-values comment; drop the others (they're dead after accept). For `var(--p-<id>, DEFAULT)` in the CSS: either substitute the literal value, or if the param is still useful as a knob going forward, leave the var and update its initial declaration to the chosen value.
-4. **Unwrap the accepted content.** Delete the `<div data-impeccable-variant="N" style="display: contents">` that wraps it. Drop `data-impeccable-params` and any `data-p-*` attributes from it; those are live-mode plumbing, not source.
+4. **Unwrap the accepted content.** Delete the inner `<div data-impeccable-variant="N" style="display: contents">` that wraps it. On JSX/TSX, also delete the outer `<div data-impeccable-carbonize="SESSION_ID" style={{ display: 'contents' }}>` wrapper if present (accept adds it so ternary/`return` slots keep a single root). Drop `data-impeccable-params` and any `data-p-*` attributes; those are live-mode plumbing, not source.
 5. **Delete the inline `<style>` block, the `<!-- impeccable-param-values -->` comment if present, and both `<!-- impeccable-carbonize-start/end -->` markers.** Also drop any `@scope` rules for variants other than the accepted one; those are dead code now.
 
 After the file is clean, run `live-complete.mjs --id SESSION_ID`, verify it reports `phase: "completed"`, then poll again.

.claude/skills/impeccable/scripts/live-accept.mjs

@@ -17,6 +17,12 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer, writeBuffer as writeManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  findSvelteComponentManifest,
+  inlineSvelteComponentAccept,
+  removeSvelteComponentSession,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -41,6 +47,9 @@ Required:
 
 Options:
   --page-url URL     Current browser page URL; scopes staged copy-edit cleanup
+  --defer-source-write
+                     Deprecated compatibility flag. Svelte component accepts
+                     now write the real source immediately.
 
 Output (JSON):
   { handled, file, carbonize }`);
@@ -64,18 +73,67 @@ Output (JSON):
 
   // Find the file containing this session's markers
   const found = findSessionFile(id, process.cwd());
-  if (!found) {
+  const svelteComponentManifest = found ? null : findSvelteComponentManifest(id, process.cwd());
+
+  if (!found && !svelteComponentManifest) {
     console.log(JSON.stringify({ handled: false, error: 'Session markers not found for id: ' + id }));
     process.exit(0);
   }
 
+  if (svelteComponentManifest) {
+    if (isDiscard) {
+      removeSvelteComponentSession(id, process.cwd());
+      console.log(JSON.stringify({
+        handled: true,
+        file: svelteComponentManifest.sourceFile,
+        carbonize: false,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      }));
+      return;
+    }
+
+    let result;
+    try {
+      result = inlineSvelteComponentAccept(
+        svelteComponentManifest,
+        variantNum,
+        paramValues,
+        process.cwd(),
+      );
+    } catch (err) {
+      result = {
+        handled: false,
+        error: err.message,
+        file: svelteComponentManifest.sourceFile,
+        sourceFile: svelteComponentManifest.sourceFile,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      };
+    }
+    if (result.carbonize) {
+      result.todo = 'REQUIRED before next poll: carbonize cleanup in ' + result.file + '. See reference/live.md "Required after accept".';
+    }
+    console.log(JSON.stringify({ handled: result.handled !== false, ...result }));
+    return;
+  }
+
   const { file: targetFile, content, lines } = found;
   const relFile = path.relative(process.cwd(), targetFile);
+  const previewBlock = findMarkerBlock(id, lines);
+  const sourceShadowPreview = previewBlock
+    ? readSourceShadowPreviewMeta(content, id)
+    : null;
+
+  if (sourceShadowPreview) {
+    console.log(JSON.stringify({
+      handled: false,
+      error: 'source_shadow_preview_deprecated',
+      hint: 'Svelte live mode now uses svelte-component injection. Re-wrap the element and regenerate variants.',
+    }));
+    process.exit(0);
+  }
 
-  // Bail if the session lives in a generated file. The agent manually wrote
-  // the wrapper there for preview, and is responsible for writing the
-  // accepted variant to true source (or cleaning up on discard). See
-  // "Handle fallback" in live.md.
   if (isGeneratedFile(targetFile, { cwd: process.cwd() })) {
     console.log(JSON.stringify({
       handled: false,
@@ -207,6 +265,71 @@ function handleDiscard(id, lines, targetFile) {
 // Accept
 // ---------------------------------------------------------------------------
 
+/**
+ * Build carbonize stitch-in lines. JSX targets occupy a single child slot
+ * (ternary branch, return value, etc.) — the same constraint as live-wrap.
+ * When isJsx, tuck markers + <style> + variant wrapper inside one outer
+ * <div data-impeccable-carbonize> so the slot keeps a single root node.
+ */
+function buildCarbonizeReplacement({
+  indent,
+  commentSyntax,
+  isJsx,
+  id,
+  variantNum,
+  cssContent,
+  paramValues,
+  restored,
+}) {
+  const lines = [];
+  if (!cssContent) {
+    lines.push(...restored);
+    return lines;
+  }
+
+  const variantStyleAttr = isJsx
+    ? "style={{ display: 'contents' }}"
+    : 'style="display: contents"';
+
+  const pushCarbonizeBody = (bodyIndent) => {
+    const bodyRestored = reindentContent(restored, indent, bodyIndent + '  ');
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    for (const cssLine of cssContent) {
+      lines.push(bodyIndent + cssLine.trimStart());
+    }
+    lines.push(bodyIndent + (isJsx ? '`}</style>' : '</style>'));
+    if (paramValues && Object.keys(paramValues).length > 0) {
+      lines.push(
+        bodyIndent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close,
+      );
+    }
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<div data-impeccable-variant="' + variantNum + '" ' + variantStyleAttr + '>');
+    lines.push(...bodyRestored);
+    lines.push(bodyIndent + '</div>');
+  };
+
+  if (isJsx) {
+    const wrapperStyle = 'style={{ display: "contents" }}';
+    lines.push(indent + '<div data-impeccable-carbonize="' + id + '" ' + wrapperStyle + '>');
+    pushCarbonizeBody(indent + '  ');
+    lines.push(indent + '</div>');
+  } else {
+    pushCarbonizeBody(indent);
+  }
+
+  return lines;
+}
+
+function reindentContent(contentLines, fromIndent, toIndent) {
+  return contentLines.map((line) => {
+    if (line.trim() === '') return '';
+    if (line.startsWith(fromIndent)) return toIndent + line.slice(fromIndent.length);
+    return toIndent + line.trimStart();
+  });
+}
+
 function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const block = findMarkerBlock(id, lines);
   if (!block) return { handled: false, error: 'Markers not found' };
@@ -235,45 +358,17 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const hasHelperAttrs = variantText.includes('data-impeccable-variant');
   const needsCarbonize = !!(cssContent || hasHelperAttrs);
 
-  // Build the replacement
   const restored = deindentContent(variantContent, indent);
-  const replacement = [];
+  const replacement = buildCarbonizeReplacement({
-
+    indent,
-  if (cssContent) {
+    commentSyntax,
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    isJsx,
-    // JSX targets need the CSS body wrapped in a template literal so that the
+    id,
-    // `{` and `}` in CSS rules don't get parsed as JSX expressions.
+    variantNum,
-    replacement.push(indent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    cssContent,
-    // Re-indent CSS content to match
+    paramValues,
-    for (const cssLine of cssContent) {
+    restored,
-      replacement.push(indent + cssLine.trimStart());
+  });
-    }
-    replacement.push(indent + (isJsx ? '`}</style>' : '</style>'));
-    if (paramValues && Object.keys(paramValues).length > 0) {
-      // Preserve the user's knob positions for the carbonize-cleanup agent
-      // to bake into the final CSS when it collapses scoped rules.
-      replacement.push(indent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close);
-    }
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
-  }
-
-  // Keep the `@scope ([data-impeccable-variant="N"])` selectors in the
-  // carbonize CSS block working visually by re-wrapping the accepted content
-  // in a data-impeccable-variant="N" div with `display: contents` (so layout
-  // isn't affected). The carbonize agent strips this attribute + wrapper when
-  // it moves the CSS to a proper stylesheet.
-  //
-  // Style attribute syntax has to follow the host file's flavor — JSX files
-  // need the object form, otherwise React 19 throws "Failed to set indexed
-  // property [0] on CSSStyleDeclaration" while parsing the string char-by-char.
-  if (cssContent) {
-    const styleAttr = isJsx ? "style={{ display: 'contents' }}" : 'style="display: contents"';
-    replacement.push(indent + '<div data-impeccable-variant="' + variantNum + '" ' + styleAttr + '>');
-    replacement.push(...restored);
-    replacement.push(indent + '</div>');
-  } else {
-    replacement.push(...restored);
-  }
 
   const newLines = [
     ...lines.slice(0, replaceRange.start),
@@ -285,6 +380,34 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   return { carbonize: needsCarbonize, acceptedOriginalText: originalContent.join('\n') };
 }
 
+function readSourceShadowPreviewMeta(content, id) {
+  const escaped = escapeRegExp(id);
+  const wrapperRe = new RegExp('<[^>]+data-impeccable-variants=(["\'])' + escaped + '\\1[^>]*>');
+  const match = String(content || '').match(wrapperRe);
+  if (!match) return null;
+  const tag = match[0];
+  if (readHtmlAttr(tag, 'data-impeccable-preview') !== 'source-shadow') return null;
+  const sourceFile = readHtmlAttr(tag, 'data-impeccable-source-file');
+  const sourceStartLine = Number(readHtmlAttr(tag, 'data-impeccable-source-start'));
+  const sourceEndLine = Number(readHtmlAttr(tag, 'data-impeccable-source-end'));
+  if (!sourceFile || !Number.isFinite(sourceStartLine) || !Number.isFinite(sourceEndLine)) return null;
+  return { sourceFile, sourceStartLine, sourceEndLine };
+}
+
+function readHtmlAttr(tag, name) {
+  const match = String(tag || '').match(new RegExp('\\s' + escapeRegExp(name) + '\\s*=\\s*(["\'])(.*?)\\1'));
+  if (!match) return null;
+  return decodeHtmlAttr(match[2]);
+}
+
+function decodeHtmlAttr(value) {
+  return String(value || '')
+    .replace(/&quot;/g, '"')
+    .replace(/&lt;/g, '<')
+    .replace(/&gt;/g, '>')
+    .replace(/&amp;/g, '&');
+}
+
 // ---------------------------------------------------------------------------
 // Parsing helpers
 // ---------------------------------------------------------------------------
@@ -686,4 +809,4 @@ if (_running?.endsWith('live-accept.mjs') || _running?.endsWith('live-accept.mjs
   acceptCli();
 }
 
-export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock };
+export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock, applyDeferredSvelteComponentAccepts };

.claude/skills/impeccable/scripts/live-completion.mjs

@@ -3,6 +3,7 @@ export function completionTypeForAcceptResult(eventType, acceptResult) {
   if (acceptResult?.handled === true && acceptResult?.carbonize === true) return 'agent_done';
   if (acceptResult?.handled === true) return 'complete';
   if (acceptResult?.mode === 'error') return 'error';
+  if (eventType === 'accept' && acceptResult?.previewMode === 'svelte-component') return 'error';
   return 'agent_done';
 }
 

.claude/skills/impeccable/scripts/live-inject.mjs

@@ -17,11 +17,38 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { resolveLiveConfigPath } from './impeccable-paths.mjs';
+import {
+  applySvelteKitLiveAdapter,
+  detectSvelteKitProject,
+  removeSvelteKitLiveAdapter,
+} from './live-sveltekit-adapter.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const CONFIG_PATH = resolveLiveConfigPath({ cwd: process.cwd(), scriptsDir: __dirname });
 const MARKER_OPEN_TEXT = 'impeccable-live-start';
 const MARKER_CLOSE_TEXT = 'impeccable-live-end';
+const IGNORE_MARKER_OPEN = '# impeccable-live-ignore-start';
+const IGNORE_MARKER_CLOSE = '# impeccable-live-ignore-end';
+
+export const LIVE_IGNORE_PATTERNS = Object.freeze([
+  '.impeccable/hook.cache.json',
+  '.impeccable/live/server.json',
+  '.impeccable/live/sessions/',
+  '.impeccable/live/previews/',
+  '.impeccable/live/annotations/',
+  '.impeccable/live/cache/',
+  '.impeccable/live/manual-edit-apply-transaction.json',
+  '.impeccable/live/manual-edit-events.jsonl',
+  '.impeccable/live/manual-edit-evidence/',
+  '.impeccable/live/pending-manual-edits.json',
+  '.impeccable/live/deferred-svelte-component-accepts.json',
+  '.impeccable-live.json',
+  '.impeccable-live/',
+  'node_modules/.impeccable-live/',
+  'src/lib/impeccable/ImpeccableLiveRoot.svelte',
+  'src/lib/impeccable/__runtime.js',
+  'src/lib/impeccable/[0-9a-f]*/',
+]);
 
 /**
  * Hard-excluded directory patterns. These are NEVER user-facing pages and
@@ -83,8 +110,14 @@ Output (JSON):
   validateConfig(config);
 
   const resolvedFiles = resolveFiles(process.cwd(), config);
+  const svelteKit = detectSvelteKitProject(process.cwd(), config);
 
   if (args.includes('--remove')) {
+    if (svelteKit) {
+      const adapterResult = removeSvelteKitLiveAdapter({ cwd: process.cwd(), config });
+      console.log(JSON.stringify({ ok: true, adapter: 'sveltekit', results: [adapterResult] }));
+      return;
+    }
     const results = resolvedFiles.map((relFile) => {
       const absFile = path.resolve(process.cwd(), relFile);
       if (!fs.existsSync(absFile)) return { file: relFile, error: 'file_not_found' };
@@ -110,6 +143,13 @@ Output (JSON):
     console.error(JSON.stringify({ ok: false, error: 'missing_port' }));
     process.exit(1);
   }
+  const gitIgnore = ensureLiveGitIgnores(process.cwd());
+
+  if (svelteKit) {
+    const adapterResult = applySvelteKitLiveAdapter({ cwd: process.cwd(), port, config });
+    console.log(JSON.stringify({ ok: true, port, adapter: 'sveltekit', gitIgnore, results: [adapterResult] }));
+    return;
+  }
 
   const results = resolvedFiles.map((relFile) => {
     const absFile = path.resolve(process.cwd(), relFile);
@@ -129,10 +169,68 @@ Output (JSON):
     };
   });
   const anyInserted = results.some((r) => r.inserted);
-  console.log(JSON.stringify({ ok: anyInserted, port, results }));
+  console.log(JSON.stringify({ ok: anyInserted, port, gitIgnore, results }));
   if (!anyInserted) process.exit(1);
 }
 
+export function ensureLiveGitIgnores(cwd = process.cwd()) {
+  const target = resolveIgnoreTarget(cwd);
+  const existing = fs.existsSync(target.path) ? fs.readFileSync(target.path, 'utf-8') : '';
+  const block = [
+    IGNORE_MARKER_OPEN,
+    ...LIVE_IGNORE_PATTERNS,
+    IGNORE_MARKER_CLOSE,
+  ].join('\n');
+  const markerRe = new RegExp(`${escapeRegExp(IGNORE_MARKER_OPEN)}[\\s\\S]*?${escapeRegExp(IGNORE_MARKER_CLOSE)}`);
+
+  let updated;
+  if (markerRe.test(existing)) {
+    updated = existing.replace(markerRe, block);
+  } else {
+    const prefix = existing.length === 0 ? '' : existing.endsWith('\n') ? existing : existing + '\n';
+    updated = `${prefix}${prefix.endsWith('\n\n') || prefix === '' ? '' : '\n'}${block}\n`;
+  }
+
+  if (updated !== existing) {
+    fs.mkdirSync(path.dirname(target.path), { recursive: true });
+    fs.writeFileSync(target.path, updated, 'utf-8');
+  }
+
+  return {
+    file: path.relative(cwd, target.path).split(path.sep).join('/'),
+    mode: target.mode,
+    changed: updated !== existing,
+    patterns: [...LIVE_IGNORE_PATTERNS],
+  };
+}
+
+function resolveIgnoreTarget(cwd) {
+  const gitExcludePath = resolveGitInfoExcludePath(cwd);
+  if (gitExcludePath) {
+    return { path: gitExcludePath, mode: 'git-info-exclude' };
+  }
+  return { path: path.join(cwd, '.gitignore'), mode: 'gitignore' };
+}
+
+function resolveGitInfoExcludePath(cwd) {
+  const dotGit = path.join(cwd, '.git');
+  if (!fs.existsSync(dotGit)) return null;
+
+  const stat = fs.statSync(dotGit);
+  if (stat.isDirectory()) return path.join(dotGit, 'info', 'exclude');
+  if (!stat.isFile()) return null;
+
+  const body = fs.readFileSync(dotGit, 'utf-8').trim();
+  const match = body.match(/^gitdir:\s*(.+)$/i);
+  if (!match) return null;
+  const gitDir = path.isAbsolute(match[1]) ? match[1] : path.resolve(cwd, match[1]);
+  return path.join(gitDir, 'info', 'exclude');
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
 /**
  * Expand config.files (which may contain glob patterns) into a literal list
  * of existing file paths relative to rootDir. Literal entries pass through;

.claude/skills/impeccable/scripts/live-insert.mjs

@@ -21,6 +21,11 @@ import {
   buildCssAuthoring,
   buildCssSelectorPrefixExamples,
 } from './live-wrap.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentInsertSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const INSERT_POSITIONS = new Set(['before', 'after']);
 
@@ -192,6 +197,41 @@ Output (JSON):
   const styleMode = detectStyleMode(targetFile);
   const isJsx = commentSyntax.open === '{/*';
   const spliceIndex = computeInsertLine(startLine, endLine, position);
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+
+  if (shouldUseSvelteComponentInjection(targetFile)) {
+    const session = scaffoldSvelteComponentInsertSession({
+      id,
+      count,
+      sourceFile: relTargetFile,
+      insertLine: spliceIndex + 1,
+      position,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      anchorLines: lines.slice(startLine, endLine + 1),
+      cwd: process.cwd(),
+    });
+    console.log(JSON.stringify({
+      mode: 'insert',
+      position,
+      file: session.manifestFile,
+      sourceFile: relTargetFile,
+      previewMode: 'svelte-component',
+      componentDir: session.componentDir,
+      propContract: session.propContract,
+      insertLine: 1,
+      sourceInsertLine: spliceIndex + 1,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      commentSyntax,
+      styleMode: 'svelte-component',
+      styleTag: null,
+      cssSelectorPrefixExamples: [],
+      cssAuthoring: buildSvelteComponentCssAuthoring(count),
+    }));
+    return;
+  }
+
   const indent = lines[spliceIndex]?.match(/^(\s*)/)?.[1]
     ?? lines[startLine]?.match(/^(\s*)/)?.[1]
     ?? '';
@@ -216,7 +256,7 @@ Output (JSON):
   console.log(JSON.stringify({
     mode: 'insert',
     position,
-    file: path.relative(process.cwd(), targetFile),
+    file: relTargetFile,
     insertLine: insertLine + 1,
     commentSyntax,
     styleMode: styleMode.mode,

.claude/skills/impeccable/scripts/live-poll.mjs

@@ -20,6 +20,7 @@ import { readLiveServerInfo } from './impeccable-paths.mjs';
 // that ceiling and loop in `pollOnce` to synthesize a long poll without
 // depending on the standalone undici package.
 export const PER_REQUEST_TIMEOUT_MS = 270_000;
+export const DEFAULT_EVENT_LEASE_MS = 600_000;
 
 const EVENT_TYPES_NEEDING_AGENT_REPLY = new Set(['generate', 'steer', 'manual_edit_apply']);
 
@@ -156,7 +157,7 @@ export async function fetchNextEvent(base, token, { totalDeadline } = {}) {
       ? totalDeadline - Date.now()
       : PER_REQUEST_TIMEOUT_MS;
     const slice = Math.min(Math.max(remaining, 1000), PER_REQUEST_TIMEOUT_MS);
-    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}`);
+    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}&leaseMs=${DEFAULT_EVENT_LEASE_MS}`);
 
     if (res.status === 401) {
       const err = new Error('Authentication failed. The server token may have changed.');
@@ -317,7 +318,7 @@ Modes:
 Options:
   --timeout=MS        One-shot poll timeout in ms (default: 600000). Ignored in --stream mode
   --ack-timeout=MS    Stream mode: max wait for --reply after generate/steer (default: 600000)
-  --file PATH         Attach a source file path to the reply (generate flow)
+  --file PATH         Attach a source file path to the reply (generate/steer flow)
   --data JSON         Attach a JSON result object to the reply (manual_edit_apply flow). Must be valid JSON
   --help              Show this help message
 

.claude/skills/impeccable/scripts/live-server.mjs

@@ -42,6 +42,10 @@ import {
 } from './live-manual-edits-buffer.mjs';
 import { buildManualEditEvidence } from './live-manual-edit-evidence.mjs';
 import { commitManualEdits } from './live-commit-manual-edits.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  removeAllSvelteComponentSessions,
+} from './live-svelte-component.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 // PRODUCT.md / DESIGN.md live wherever context.mjs resolves. The generated
@@ -103,6 +107,7 @@ const MIN_MANUAL_EDIT_APPLY_CHUNK_SIZE = 1;
 const MAX_MANUAL_EDIT_APPLY_CHUNK_SIZE = 20;
 const MANUAL_APPLY_COMPACT_TEXT_LIMIT = 240;
 const MANUAL_APPLY_COMPACT_NEARBY_LIMIT = 4;
+const POLL_LEASE_EXPIRY_TIMER_GRACE_MS = 2;
 const DEBUG_MANUAL_EDIT_EVENTS = /^(1|true|yes)$/i.test(process.env.IMPECCABLE_LIVE_DEBUG_EVENTS || '');
 
 function tombstoneTimedOutApplyId(eventId, details = {}) {
@@ -897,6 +902,8 @@ function leaseEvent(entry, leaseMs) {
     return entry.event;
   }
   entry.leaseUntil = Date.now() + leaseMs;
+  scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return entry.event;
 }
 
@@ -907,9 +914,16 @@ function acknowledgePendingEvent(id) {
   const acknowledged = state.pendingEvents[idx].event;
   state.pendingEvents.splice(idx, 1);
   scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return acknowledged;
 }
 
+function findPendingEventById(id) {
+  if (!id) return null;
+  const entry = state.pendingEvents.find((item) => item.event?.id === id);
+  return entry?.event || null;
+}
+
 function manualApplyReplyCommand(eventOrId = 'EVENT_ID') {
   const id = typeof eventOrId === 'string' ? eventOrId : eventOrId?.id || 'EVENT_ID';
   return `live-poll.mjs --reply ${id} done --data '<json>'`;
@@ -955,6 +969,42 @@ function summarizePendingEventForStatus(entry) {
   return summary;
 }
 
+function summarizeActiveSessionForClient(snapshot = {}) {
+  return {
+    id: snapshot.id,
+    phase: snapshot.phase,
+    pageUrl: snapshot.pageUrl ?? null,
+    sourceFile: snapshot.sourceFile ?? null,
+    previewFile: snapshot.previewFile ?? null,
+    previewMode: snapshot.previewMode ?? null,
+    expectedVariants: snapshot.expectedVariants ?? 0,
+    arrivedVariants: snapshot.arrivedVariants ?? 0,
+    visibleVariant: snapshot.visibleVariant ?? null,
+    checkpointRevision: snapshot.checkpointRevision ?? 0,
+    paramValues: snapshot.paramValues || {},
+  };
+}
+
+function activeSessionSummaries() {
+  if (!state.sessionStore) return [];
+  return state.sessionStore.listActiveSessions().map((snapshot) => summarizeActiveSessionForClient(snapshot));
+}
+
+function cancelQueuedAnonymousExitEvents() {
+  let removed = 0;
+  for (let i = state.pendingEvents.length - 1; i >= 0; i -= 1) {
+    const event = state.pendingEvents[i]?.event;
+    if (event?.type !== 'exit' || event.id) continue;
+    state.pendingEvents.splice(i, 1);
+    removed += 1;
+  }
+  if (removed > 0) {
+    scheduleLeaseFlush();
+    broadcastAgentPollingIfChanged();
+  }
+  return removed;
+}
+
 function cancelPendingManualApplyEvents(pageUrl, reason = 'manual_edit_discarded') {
   const canceledById = new Map();
   const shouldCancel = (event) => event?.type === 'manual_edit_apply' && (!pageUrl || event.pageUrl === pageUrl);
@@ -1001,7 +1051,6 @@ function scheduleLeaseFlush() {
     clearTimeout(state.leaseTimer);
     state.leaseTimer = null;
   }
-  if (state.pendingPolls.length === 0) return;
   const now = Date.now();
   const nextLeaseUntil = state.pendingEvents
     .map((entry) => entry.leaseUntil || 0)
@@ -1011,7 +1060,8 @@ function scheduleLeaseFlush() {
   state.leaseTimer = setTimeout(() => {
     state.leaseTimer = null;
     flushPendingPolls();
-  }, Math.max(0, nextLeaseUntil - now));
+    broadcastAgentPollingIfChanged();
+  }, Math.max(0, nextLeaseUntil - now + POLL_LEASE_EXPIRY_TIMER_GRACE_MS));
 }
 
 function flushPendingPolls() {
@@ -1032,7 +1082,9 @@ function flushPendingPolls() {
 }
 
 function agentPollingConnected() {
-  return state.pendingPolls.length > 0;
+  const now = Date.now();
+  return state.pendingPolls.length > 0
+    || state.pendingEvents.some((entry) => entry.leaseUntil && entry.leaseUntil > now);
 }
 
 function broadcastAgentPollingIfChanged() {
@@ -1318,7 +1370,7 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/status') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401, { 'Content-Type': 'application/json' }); res.end(JSON.stringify({ error: 'Unauthorized' })); return; }
-      const sessions = state.sessionStore ? state.sessionStore.listActiveSessions() : [];
+      const sessions = activeSessionSummaries();
       res.writeHead(200, { 'Content-Type': 'application/json' });
       res.end(JSON.stringify({
         status: 'ok',
@@ -1423,6 +1475,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/events' && req.method === 'GET') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401); res.end('Unauthorized'); return; }
+      clearTimeout(state.exitTimer);
+      state.exitTimer = null;
+      cancelQueuedAnonymousExitEvents();
       res.writeHead(200, {
         'Content-Type': 'text/event-stream',
         'Cache-Control': 'no-cache',
@@ -1432,10 +1487,10 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
         type: 'connected',
         hasProjectContext: hasProjectContext(),
         agentPolling: agentPollingConnected(),
+        activeSessions: activeSessionSummaries(),
       }) + '\n\n');
 
       state.sseClients.add(res);
-      clearTimeout(state.exitTimer);
 
       // Keepalive: SSE comment every 30s prevents silent connection drops.
       const heartbeat = setInterval(() => {
@@ -1827,6 +1882,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
             return;
           }
         }
+        if (msg.type === 'exit') {
+          cleanupSvelteComponentSessionsBeforeExit();
+        }
         if (msg.type !== 'checkpoint') {
           enqueueEvent(msg);
         }
@@ -1905,6 +1963,36 @@ function handlePollGet(req, res, url) {
   });
 }
 
+function sessionFileMetadataFromPollReply(file) {
+  if (!file || typeof file !== 'string') return { file };
+  const normalized = file.split(path.sep).join('/');
+  const base = { file: normalized };
+  if (!normalized.endsWith('/manifest.json') && normalized !== 'manifest.json') return base;
+  if (!normalized.includes('node_modules/.impeccable-live/') && !normalized.includes('src/lib/impeccable/')) return base;
+
+  let full;
+  try {
+    full = path.resolve(process.cwd(), normalized);
+    const rel = path.relative(process.cwd(), full);
+    if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) return base;
+  } catch {
+    return base;
+  }
+
+  try {
+    const manifest = JSON.parse(fs.readFileSync(full, 'utf-8'));
+    if (manifest?.previewMode !== 'svelte-component' || !manifest.sourceFile) return base;
+    return {
+      file: String(manifest.sourceFile).split(path.sep).join('/'),
+      sourceFile: String(manifest.sourceFile).split(path.sep).join('/'),
+      previewFile: normalized,
+      previewMode: 'svelte-component',
+    };
+  } catch {
+    return base;
+  }
+}
+
 function handlePollPost(req, res) {
   let body = '';
   req.on('data', (c) => { body += c; });
@@ -1965,6 +2053,16 @@ function handlePollPost(req, res) {
       res.end(JSON.stringify({ error: 'stale_manual_edit_apply_reply', ...rollback }));
       return;
     }
+    const pendingEventBeforeAck = findPendingEventById(msg.id);
+    if (pendingEventBeforeAck?.type === 'steer' && msg.type === 'steer_done'
+        && !msg.file && !(typeof msg.message === 'string' && msg.message.trim())) {
+      res.writeHead(400, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({
+        error: 'steer_done_requires_file_or_message',
+        hint: 'Reply with --file after writing source, or include a message explaining an intentional no-op.',
+      }));
+      return;
+    }
     const acknowledgedEvent = acknowledgePendingEvent(msg.id);
     let skipJournalReply = false;
     let existingSession = null;
@@ -1987,6 +2085,7 @@ function handlePollPost(req, res) {
       }));
       return;
     }
+    const replyFileMeta = sessionFileMetadataFromPollReply(msg.file);
     if (state.sessionStore && msg.id && !skipJournalReply) {
       try {
         const eventType = msg.type === 'steer_done'
@@ -2001,7 +2100,10 @@ function handlePollPost(req, res) {
         state.sessionStore.appendEvent({
           type: eventType,
           id: msg.id,
-          file: msg.file,
+          file: replyFileMeta.file,
+          sourceFile: replyFileMeta.sourceFile,
+          previewFile: replyFileMeta.previewFile,
+          previewMode: replyFileMeta.previewMode,
           message: msg.message,
           sourceEventType: acknowledgedEvent?.type,
           carbonize: msg.data?.carbonize === true,
@@ -2010,7 +2112,16 @@ function handlePollPost(req, res) {
     }
     flushPendingPolls();
     // Forward the reply to the browser via SSE
-    broadcast({ type: msg.type || 'done', id: msg.id, message: msg.message, file: msg.file, data: msg.data });
+    broadcast({
+      type: msg.type || 'done',
+      id: msg.id,
+      message: msg.message,
+      file: msg.file,
+      sourceFile: replyFileMeta.sourceFile,
+      previewFile: replyFileMeta.previewFile,
+      previewMode: replyFileMeta.previewMode,
+      data: msg.data,
+    });
     res.writeHead(200, { 'Content-Type': 'application/json' });
     res.end(JSON.stringify({ ok: true }));
   });
@@ -2023,6 +2134,7 @@ function handlePollPost(req, res) {
 let httpServer = null;
 
 function shutdown() {
+  cleanupSvelteComponentSessionsBeforeExit();
   removeLiveServerInfo(process.cwd());
   if (state.leaseTimer) clearTimeout(state.leaseTimer);
   state.leaseTimer = null;
@@ -2037,6 +2149,25 @@ function shutdown() {
   process.exit(0);
 }
 
+function cleanupSvelteComponentSessionsBeforeExit() {
+  try {
+    removeAllSvelteComponentSessions(process.cwd());
+  } catch (err) {
+    console.warn('[impeccable] Svelte component session cleanup failed:', err.message);
+  }
+}
+
+function applyLegacyDeferredAcceptsOnStartup() {
+  try {
+    const result = applyDeferredSvelteComponentAccepts(process.cwd());
+    if (result.applied > 0 || result.failed > 0) {
+      console.log('[impeccable] applied legacy deferred Svelte component accepts:', JSON.stringify(result));
+    }
+  } catch (err) {
+    console.warn('[impeccable] legacy deferred Svelte component accept apply failed:', err.message);
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Main
 // ---------------------------------------------------------------------------
@@ -2162,6 +2293,7 @@ rollbackManualApplyTransaction({
   cwd: process.cwd(),
   reason: 'manual_edit_server_start_recovered_abandoned_transaction',
 });
+applyLegacyDeferredAcceptsOnStartup();
 restorePendingEventsFromStore();
 pruneStaleManualApplyEvidence(process.cwd());
 const portArg = args.find(a => a.startsWith('--port='));

.claude/skills/impeccable/scripts/live-session-store.mjs

@@ -106,6 +106,8 @@ function baseSnapshot(id) {
     phase: 'new',
     pageUrl: null,
     sourceFile: null,
+    previewFile: null,
+    previewMode: null,
     expectedVariants: 0,
     arrivedVariants: 0,
     visibleVariant: null,
@@ -177,8 +179,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
     case 'variants_ready':
     case 'agent_done':
       next.phase = event.carbonize === true ? 'carbonize_required' : 'variants_ready';
-      next.sourceFile = event.file ?? next.sourceFile;
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
-      next.arrivedVariants = event.arrivedVariants ?? (next.arrivedVariants ?? next.expectedVariants);
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.arrivedVariants = event.arrivedVariants ?? (next.expectedVariants || next.arrivedVariants || 0);
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       if (event.carbonize === true) {
@@ -190,12 +194,19 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       }
       break;
     case 'checkpoint':
+      if (COMPLETED_PHASES.has(next.phase)) {
+        next.diagnostics.push({ error: 'checkpoint_after_terminal_ignored', phase: event.phase ?? null, revision: event.revision ?? null });
+        break;
+      }
       if ((event.revision ?? 0) >= (next.checkpointRevision ?? 0)) {
         next.phase = event.phase ?? next.phase;
         next.checkpointRevision = event.revision ?? next.checkpointRevision;
         next.activeOwner = event.owner ?? next.activeOwner;
         next.arrivedVariants = event.arrivedVariants ?? next.arrivedVariants;
         next.visibleVariant = event.visibleVariant ?? next.visibleVariant;
+        next.sourceFile = event.sourceFile ?? next.sourceFile;
+        next.previewFile = event.previewFile ?? next.previewFile;
+        next.previewMode = event.previewMode ?? next.previewMode;
         if (event.paramValues) next.paramValues = { ...event.paramValues };
       } else {
         next.diagnostics.push({ error: 'stale_checkpoint_ignored', revision: event.revision });
@@ -223,6 +234,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'steer_done':
       next.phase = 'steer_done';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.message = event.message ?? next.message;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;
@@ -238,6 +253,9 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'complete':
       next.phase = 'completed';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;

.claude/skills/impeccable/scripts/live-svelte-component.mjs

@@ -0,0 +1,826 @@
+/**
+ * Svelte live-mode component injection helpers.
+ *
+ * Variants are real .svelte components under node_modules/.impeccable-live/<session-id>/.
+ * The browser mounts them via Svelte 5 mount(); accept inlines the chosen
+ * variant back into the route source with props mapped to original bindings.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+import os from 'node:os';
+import { createHash } from 'node:crypto';
+
+export const SVELTE_COMPONENT_ROOT = 'node_modules/.impeccable-live';
+export const SVELTE_RUNTIME_FILE = `${SVELTE_COMPONENT_ROOT}/__runtime.js`;
+export const DEFERRED_ACCEPTS_FILE = '.impeccable/live/deferred-svelte-component-accepts.json';
+
+const MUSTACHE_RE = /\{([^{}]+)\}/g;
+
+export function shouldUseSvelteComponentInjection(filePath) {
+  if (/^(0|false|no)$/i.test(process.env.IMPECCABLE_LIVE_SVELTE_COMPONENT || '')) return false;
+  return path.extname(filePath).toLowerCase() === '.svelte';
+}
+
+export function componentSessionDir(id, cwd = process.cwd()) {
+  return path.join(cwd, SVELTE_COMPONENT_ROOT, id);
+}
+
+export function manifestPathForSession(id, cwd = process.cwd()) {
+  return path.join(componentSessionDir(id, cwd), 'manifest.json');
+}
+
+export function ensureRuntimeHelper(cwd = process.cwd()) {
+  const file = path.join(cwd, SVELTE_RUNTIME_FILE);
+  if (fs.existsSync(file)) return file;
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, `export { mount, unmount } from 'svelte';\n`, 'utf-8');
+  return file;
+}
+
+/**
+ * Extract ordered unique mustache expressions from markup (not inside <!-- -->).
+ */
+export function extractMustacheExpressions(text) {
+  const expressions = [];
+  const seen = new Set();
+  const lines = String(text || '').split('\n');
+  for (const line of lines) {
+    const trimmed = line.trim();
+    if (trimmed.startsWith('<!--')) continue;
+    let match;
+    MUSTACHE_RE.lastIndex = 0;
+    while ((match = MUSTACHE_RE.exec(line)) !== null) {
+      const expr = match[1].trim();
+      if (!expr || seen.has(expr)) continue;
+      seen.add(expr);
+      expressions.push(expr);
+    }
+  }
+  return expressions;
+}
+
+export function buildPropContract(expressions) {
+  return expressions.map((expr, index) => {
+    const derived = derivePropName(expr, index);
+    return {
+      prop: derived,
+      expr,
+      placeholder: `{${expr}}`,
+    };
+  });
+}
+
+function derivePropName(expr, index) {
+  const tail = expr.match(/(?:\.|\[)(\w+)\s*\]?$/);
+  if (tail && tail[1] && /^[A-Za-z_$][\w$]*$/.test(tail[1])) {
+    return tail[1];
+  }
+  return `prop${index}`;
+}
+
+export function substituteExprsWithProps(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(entry.placeholder).join(`{${entry.prop}}`);
+  }
+  return out;
+}
+
+export function substitutePropsWithExprs(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(`{${entry.prop}}`).join(`{${entry.expr}}`);
+  }
+  return out;
+}
+
+export function parseSvelteComponentFile(content) {
+  const text = String(content || '');
+  const scriptMatch = text.match(/^([\s\S]*?)<script\b[^>]*>[\s\S]*?<\/script>/i);
+  const withoutScript = scriptMatch ? text.slice(scriptMatch[0].length) : text;
+  const styleMatch = withoutScript.match(/<style\b[^>]*>[\s\S]*?<\/style\s*>/i);
+  const styleBlock = styleMatch ? styleMatch[0] : '';
+  const markup = styleMatch
+    ? withoutScript.slice(0, styleMatch.index).trim()
+    : withoutScript.trim();
+  const cssLines = styleBlock
+    ? styleBlock
+      .replace(/^<style\b[^>]*>/i, '')
+      .replace(/<\/style\s*>$/i, '')
+      .split('\n')
+      .map((line) => line.trimEnd())
+    : [];
+  while (cssLines.length > 0 && cssLines[0].trim() === '') cssLines.shift();
+  while (cssLines.length > 0 && cssLines[cssLines.length - 1].trim() === '') cssLines.pop();
+  return { markup, cssLines, styleBlock };
+}
+
+function buildPropsScript(contract) {
+  if (contract.length === 0) {
+    return '<script>\n  /** @type {Record<string, never>} */\n  let {} = $props();\n</script>\n';
+  }
+  const names = contract.map((c) => c.prop).join(', ');
+  const typeFields = contract.map((c) => `    ${c.prop}: string;`).join('\n');
+  return `<script>\n  /** @type {{\n${typeFields}\n  }} */\n  let { ${names} } = $props();\n</script>\n`;
+}
+
+function buildVariantStub(variantNum, originalWithProps, contract) {
+  const propsComment = contract.length > 0
+    ? `\n<!-- Props: ${contract.map((c) => `${c.prop} <- {${c.expr}}`).join(', ')} -->\n`
+    : '';
+  return `${buildPropsScript(contract)}${propsComment}${originalWithProps.trim()}\n\n<style>\n  /* Variant ${variantNum}: add scoped CSS here */\n</style>\n`;
+}
+
+function buildInsertVariantStub(variantNum) {
+  return `${buildPropsScript([])}<div class="impeccable-insert-preview">Insert variant ${variantNum}</div>\n\n<style>\n  .impeccable-insert-preview { display: block; }\n</style>\n`;
+}
+
+export function scaffoldSvelteComponentSession({
+  id,
+  count,
+  sourceFile,
+  sourceStartLine,
+  sourceEndLine,
+  originalLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const originalMarkup = originalLines.join('\n');
+  const contract = buildPropContract(extractMustacheExpressions(originalMarkup));
+  const originalWithProps = substituteExprsWithProps(originalMarkup, contract);
+
+  const manifest = {
+    id,
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    sourceStartLine,
+    sourceEndLine,
+    count,
+    propContract: contract,
+    originalMarkup,
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildVariantStub(n, originalWithProps, contract), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: contract,
+  };
+}
+
+export function scaffoldSvelteComponentInsertSession({
+  id,
+  count,
+  sourceFile,
+  insertLine,
+  position,
+  anchorStartLine,
+  anchorEndLine,
+  anchorLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const anchorMarkup = (anchorLines || []).join('\n');
+  const manifest = {
+    id,
+    mode: 'insert',
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    insertLine,
+    position,
+    anchorStartLine,
+    anchorEndLine,
+    originalMarkup: anchorMarkup,
+    anchorMarkup,
+    count,
+    propContract: [],
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildInsertVariantStub(n), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: [],
+  };
+}
+
+export function findSvelteComponentManifest(id, cwd = process.cwd()) {
+  const direct = manifestPathForSession(id, cwd);
+  if (fs.existsSync(direct)) {
+    return readManifest(direct);
+  }
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return null;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    const candidate = path.join(root, entry.name, 'manifest.json');
+    if (!fs.existsSync(candidate)) continue;
+    try {
+      const manifest = readManifest(candidate);
+      if (manifest?.id === id) return { ...manifest, manifestPath: candidate };
+    } catch { /* skip */ }
+  }
+  return null;
+}
+
+export function readManifest(manifestPath) {
+  const data = JSON.parse(fs.readFileSync(manifestPath, 'utf-8'));
+  return {
+    ...data,
+    manifestPath,
+  };
+}
+
+export function resolveSourceFile(sourceFile, cwd = process.cwd()) {
+  if (!sourceFile || path.isAbsolute(sourceFile)) {
+    throw new Error('Invalid svelte-component source file');
+  }
+  const full = path.resolve(cwd, sourceFile);
+  const rel = path.relative(cwd, full);
+  if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) {
+    throw new Error('Svelte-component source file escapes project root');
+  }
+  if (!fs.existsSync(full)) {
+    throw new Error('Svelte-component source file not found: ' + sourceFile);
+  }
+  return full;
+}
+
+function appendCssToSvelteStyle(lines, cssLines) {
+  const closeIdx = findLastStyleCloseLine(lines);
+  const prepared = ['', ...cssLines.map((line) => (line.trim() === '' ? '' : '  ' + line.trimStart()))];
+  if (closeIdx === -1) {
+    return [...lines, '', '<style>', ...prepared.slice(1), '</style>'];
+  }
+  return [
+    ...lines.slice(0, closeIdx),
+    ...prepared,
+    ...lines.slice(closeIdx),
+  ];
+}
+
+function findLastStyleCloseLine(lines) {
+  for (let i = lines.length - 1; i >= 0; i--) {
+    if (/<\/style\s*>/.test(lines[i])) return i;
+  }
+  return -1;
+}
+
+function bakeParamValuesInCss(cssLines, paramValues) {
+  if (!paramValues || Object.keys(paramValues).length === 0) return cssLines;
+  return cssLines.map((line) => {
+    let out = line;
+    for (const [key, value] of Object.entries(paramValues)) {
+      const varName = `--p-${key}`;
+      out = out.replace(new RegExp(`var\\(${escapeRegExp(varName)}(?:,\\s*[^)]+)?\\)`, 'g'), String(value));
+    }
+    return out;
+  });
+}
+
+function sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues = null, rootTag = 'div') {
+  const css = String((cssLines || []).join('\n'));
+  if (!/data-impeccable-variant|impeccable-variant-ready/.test(css)) return cssLines;
+
+  const rules = parseCssRules(css);
+  const output = [];
+  for (const rule of rules) {
+    appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag);
+  }
+  return output.join('\n')
+    .split('\n')
+    .map((line) => line.trimEnd())
+    .filter((line) => line.trim() !== '');
+}
+
+function appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag) {
+  const prelude = rule.prelude.trim();
+  const body = rule.body.trim();
+  if (!prelude || !body || /--impeccable-variant-ready\s*:/.test(body)) return;
+
+  if (/^@scope\b/i.test(prelude)) {
+    if (/data-impeccable-variant/.test(prelude) && !selectorHasVariant(prelude, variantNum)) return;
+    const inner = parseCssRules(body);
+    for (const innerRule of inner) {
+      const rewrittenPrelude = rewriteAcceptedSvelteSelector(innerRule.prelude, variantNum, paramValues, rootTag, true);
+      if (!rewrittenPrelude || /--impeccable-variant-ready\s*:/.test(innerRule.body)) continue;
+      output.push(formatCssRule(rewrittenPrelude, innerRule.body.trim()));
+    }
+    return;
+  }
+
+  const rewrittenPrelude = rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, false);
+  if (!rewrittenPrelude) return;
+  output.push(formatCssRule(rewrittenPrelude, body));
+}
+
+function parseCssRules(css) {
+  const rules = [];
+  const text = String(css || '');
+  let i = 0;
+  while (i < text.length) {
+    while (i < text.length && /\s/.test(text[i])) i++;
+    const preludeStart = i;
+    while (i < text.length && text[i] !== '{') i++;
+    if (i >= text.length) break;
+    const prelude = text.slice(preludeStart, i).trim();
+    i++;
+    const bodyStart = i;
+    let depth = 1;
+    let quote = null;
+    let comment = false;
+    while (i < text.length && depth > 0) {
+      const ch = text[i];
+      const next = text[i + 1];
+      if (comment) {
+        if (ch === '*' && next === '/') {
+          comment = false;
+          i += 2;
+          continue;
+        }
+        i++;
+        continue;
+      }
+      if (quote) {
+        if (ch === '\\') {
+          i += 2;
+          continue;
+        }
+        if (ch === quote) quote = null;
+        i++;
+        continue;
+      }
+      if (ch === '/' && next === '*') {
+        comment = true;
+        i += 2;
+        continue;
+      }
+      if (ch === '"' || ch === "'") {
+        quote = ch;
+        i++;
+        continue;
+      }
+      if (ch === '{') depth++;
+      else if (ch === '}') depth--;
+      i++;
+    }
+    const body = text.slice(bodyStart, Math.max(bodyStart, i - 1));
+    if (prelude) rules.push({ prelude, body });
+  }
+  return rules;
+}
+
+function rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, fromScope) {
+  const selectors = splitSelectorList(prelude);
+  const rewritten = [];
+  for (const selector of selectors) {
+    const next = rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope);
+    if (next) rewritten.push(next);
+  }
+  return rewritten.join(', ');
+}
+
+function rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope) {
+  let out = selector.trim();
+  const hasVariant = /data-impeccable-variant/.test(out);
+  if (hasVariant && !selectorHasVariant(out, variantNum)) return '';
+  if (hasVariant) {
+    out = out.replace(variantSelectorRegex(variantNum), '');
+    out = out.replace(/\[data-impeccable-variant=(["']).*?\1\]/g, '');
+  }
+
+  const paramResult = rewriteParamSelectors(out, paramValues);
+  if (!paramResult.keep) return '';
+  out = paramResult.selector;
+
+  out = out
+    .replace(/:scope(?:\[[^\]]+\])?\s*>\s*/g, '')
+    .replace(/:scope(?:\[[^\]]+\])?/g, rootTag || '')
+    .replace(/\s+/g, ' ')
+    .trim();
+
+  out = out.replace(/^[>+~]\s*/, '').trim();
+  if (!out && (hasVariant || fromScope)) return rootTag || ':global(*)';
+  return out;
+}
+
+function rewriteParamSelectors(selector, paramValues) {
+  let keep = true;
+  const next = selector.replace(/\[data-p-([A-Za-z0-9_-]+)(?:=(["'])(.*?)\2)?\]/g, (_match, key, _quote, expected) => {
+    if (!paramValues || !Object.prototype.hasOwnProperty.call(paramValues, key)) return '';
+    const actual = paramValues[key];
+    if (expected != null && String(actual) !== String(expected)) {
+      keep = false;
+      return '';
+    }
+    if (expected == null && (actual === false || actual == null || actual === 'false' || actual === 'off' || actual === '0')) {
+      keep = false;
+      return '';
+    }
+    return '';
+  });
+  return { keep, selector: next };
+}
+
+function splitSelectorList(prelude) {
+  const selectors = [];
+  let start = 0;
+  let bracket = 0;
+  let paren = 0;
+  let quote = null;
+  for (let i = 0; i < prelude.length; i++) {
+    const ch = prelude[i];
+    if (quote) {
+      if (ch === '\\') i++;
+      else if (ch === quote) quote = null;
+      continue;
+    }
+    if (ch === '"' || ch === "'") {
+      quote = ch;
+      continue;
+    }
+    if (ch === '[') bracket++;
+    else if (ch === ']') bracket = Math.max(0, bracket - 1);
+    else if (ch === '(') paren++;
+    else if (ch === ')') paren = Math.max(0, paren - 1);
+    else if (ch === ',' && bracket === 0 && paren === 0) {
+      selectors.push(prelude.slice(start, i));
+      start = i + 1;
+    }
+  }
+  selectors.push(prelude.slice(start));
+  return selectors;
+}
+
+function selectorHasVariant(selector, variantNum) {
+  return variantSelectorRegex(variantNum).test(selector);
+}
+
+function variantSelectorRegex(variantNum) {
+  return new RegExp(`\\[data-impeccable-variant=(["'])${escapeRegExp(String(variantNum))}\\1\\]`, 'g');
+}
+
+function formatCssRule(selector, body) {
+  return `${selector} { ${body.trim()} }`;
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+export function inlineSvelteComponentAccept(manifest, variantNum, paramValues = null, cwd = process.cwd()) {
+  const sourceFile = resolveSourceFile(manifest.sourceFile, cwd);
+  const variantPath = path.join(cwd, manifest.componentDir, `v${variantNum}.svelte`);
+  const resultBase = {
+    file: manifest.sourceFile,
+    sourceFile: manifest.sourceFile,
+    previewMode: 'svelte-component',
+    componentDir: manifest.componentDir,
+    carbonize: false,
+  };
+  if (!fs.existsSync(variantPath)) {
+    return { handled: false, error: `Variant ${variantNum} not found`, ...resultBase };
+  }
+
+  const { markup, cssLines } = parseSvelteComponentFile(fs.readFileSync(variantPath, 'utf-8'));
+  if (manifest.mode === 'insert') {
+    return inlineSvelteComponentInsertAccept({
+      manifest,
+      markup,
+      cssLines,
+      variantNum,
+      paramValues,
+      sourceFile,
+      resultBase,
+      cwd,
+    });
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const contract = manifest.propContract || [];
+  const mergedMarkup = mergeOriginalTopLevelAttrs(markup, manifest.originalMarkup || '');
+  const restoredMarkup = substitutePropsWithExprs(mergedMarkup, contract)
+    .split('\n')
+    .map((line) => line.trimEnd());
+
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const start = Number(manifest.sourceStartLine) - 1;
+  const end = Number(manifest.sourceEndLine) - 1;
+  if (!Number.isInteger(start) || !Number.isInteger(end) || start < 0 || end < start || end >= sourceLines.length) {
+    return { handled: false, error: 'Invalid source line range for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const indent = sourceLines[start].match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, start),
+    ...indentedMarkup,
+    ...sourceLines.slice(end + 1),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function inlineSvelteComponentInsertAccept({
+  manifest,
+  markup,
+  cssLines,
+  variantNum,
+  paramValues,
+  sourceFile,
+  resultBase,
+  cwd,
+}) {
+  if (!svelteMarkupHasVisibleContent(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant is empty', ...resultBase };
+  }
+  if (/\bdata-impeccable-[\w-]*\s*=/.test(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant contains preview-only data-impeccable attributes', ...resultBase };
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const restoredMarkup = String(markup || '')
+    .split('\n')
+    .map((line) => line.trimEnd());
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const insertIndex = Number(manifest.insertLine) - 1;
+  if (!Number.isInteger(insertIndex) || insertIndex < 0 || insertIndex > sourceLines.length) {
+    return { handled: false, error: 'Invalid insert line for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const nearbyLine = sourceLines[insertIndex] ?? sourceLines[insertIndex - 1] ?? '';
+  const indent = nearbyLine.match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, insertIndex),
+    ...indentedMarkup,
+    ...sourceLines.slice(insertIndex),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function svelteMarkupHasVisibleContent(markup) {
+  const text = String(markup || '')
+    .replace(/<script[\s\S]*?<\/script>/gi, '')
+    .replace(/<style[\s\S]*?<\/style>/gi, '')
+    .replace(/<!--[\s\S]*?-->/g, '')
+    .replace(/<[^>]+>/g, ' ')
+    .replace(/\s+/g, ' ')
+    .trim();
+  if (text.length > 0) return true;
+  return /<(img|svg|canvas|video|audio|picture|input|button|select|textarea)\b/i.test(markup || '');
+}
+
+function mergeOriginalTopLevelAttrs(markup, originalMarkup) {
+  const variantOpen = matchOpeningTag(markup);
+  const originalOpen = matchOpeningTag(originalMarkup);
+  if (!variantOpen || !originalOpen) return markup;
+  if (variantOpen.tag.toLowerCase() !== originalOpen.tag.toLowerCase()) return markup;
+
+  const variantAttrs = parseAttrSegments(variantOpen.attrs);
+  const originalAttrs = parseAttrSegments(originalOpen.attrs);
+  const additions = [];
+  let attrs = variantOpen.attrs;
+
+  const originalClass = originalAttrs.get('class');
+  const variantClass = variantAttrs.get('class');
+  if (originalClass && variantClass) {
+    const merged = mergeStaticClassAttr(originalClass, variantClass);
+    if (merged) {
+      attrs = attrs.slice(0, variantClass.start) + merged + attrs.slice(variantClass.end);
+      variantAttrs.set('class', { ...variantClass, raw: merged });
+    }
+  } else if (originalClass && !variantClass) {
+    additions.push(originalClass.raw);
+  }
+
+  for (const [name, attr] of originalAttrs) {
+    if (name === 'class') continue;
+    if (!variantAttrs.has(name)) additions.push(attr.raw);
+  }
+
+  if (additions.length === 0 && attrs === variantOpen.attrs) return markup;
+  const nextOpen = variantOpen.prefix
+    + variantOpen.tag
+    + attrs
+    + additions.map((attr) => ' ' + attr.trim()).join('')
+    + variantOpen.close;
+  return markup.slice(0, variantOpen.index) + nextOpen + markup.slice(variantOpen.index + variantOpen.raw.length);
+}
+
+function matchOpeningTag(markup) {
+  const match = String(markup || '').match(/^(\s*<)([A-Za-z][\w:-]*)([^>]*?)(\/?>)/);
+  if (!match) return null;
+  return {
+    raw: match[0],
+    prefix: match[1],
+    tag: match[2],
+    attrs: match[3] || '',
+    close: match[4],
+    index: match.index || 0,
+  };
+}
+
+function parseAttrSegments(attrs) {
+  const out = new Map();
+  const re = /([A-Za-z_:][\w:.-]*)(?:\s*=\s*(?:"[^"]*"|'[^']*'|\{[^}]*\}|[^\s"'>=]+))?/g;
+  let match;
+  while ((match = re.exec(attrs))) {
+    const raw = match[0];
+    const name = match[1];
+    out.set(name, {
+      name,
+      raw,
+      start: match.index,
+      end: match.index + raw.length,
+    });
+  }
+  return out;
+}
+
+function mergeStaticClassAttr(originalClass, variantClass) {
+  const originalValue = originalClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  const variantValue = variantClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  if (!originalValue || !variantValue) return null;
+  const quote = variantValue[1];
+  const classes = [
+    ...variantValue[2].split(/\s+/),
+    ...originalValue[2].split(/\s+/),
+  ].filter(Boolean);
+  return `class=${quote}${[...new Set(classes)].join(' ')}${quote}`;
+}
+
+export function removeSvelteComponentSession(id, cwd = process.cwd()) {
+  const dir = componentSessionDir(id, cwd);
+  try {
+    fs.rmSync(dir, { recursive: true, force: true });
+  } catch { /* non-fatal */ }
+}
+
+export function removeAllSvelteComponentSessions(cwd = process.cwd()) {
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    if (entry.name.startsWith('__')) continue;
+    try {
+      fs.rmSync(path.join(root, entry.name), { recursive: true, force: true });
+    } catch { /* non-fatal */ }
+  }
+}
+
+export function deferredAcceptsPath(cwd = process.cwd()) {
+  const key = createHash('sha1').update(path.resolve(cwd)).digest('hex').slice(0, 16);
+  return path.join(os.tmpdir(), 'impeccable-live', key, 'deferred-svelte-component-accepts.json');
+}
+
+export function readDeferredAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  try {
+    return JSON.parse(fs.readFileSync(file, 'utf-8'));
+  } catch {
+    return { accepts: [] };
+  }
+}
+
+export function writeDeferredAccept(entry, cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  const data = readDeferredAccepts(cwd);
+  data.accepts = (data.accepts || []).filter((item) => item.id !== entry.id);
+  data.accepts.push({ ...entry, createdAt: new Date().toISOString() });
+  fs.writeFileSync(file, JSON.stringify(data, null, 2) + '\n', 'utf-8');
+}
+
+export function applyDeferredSvelteComponentAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  const data = readDeferredAccepts(cwd);
+  const pending = Array.isArray(data.accepts) ? data.accepts : [];
+  const results = [];
+  const remaining = [];
+  for (const entry of pending) {
+    try {
+      const manifest = findSvelteComponentManifest(entry.id, cwd);
+      if (!manifest) {
+        results.push({ id: entry.id, ok: false, error: 'manifest not found' });
+        remaining.push(entry);
+        continue;
+      }
+      const result = inlineSvelteComponentAccept(
+        manifest,
+        entry.variantNum,
+        entry.paramValues || null,
+        cwd,
+      );
+      results.push({ id: entry.id, ok: result.handled !== false, result });
+      if (result.handled === false) remaining.push(entry);
+    } catch (err) {
+      results.push({ id: entry.id, ok: false, error: err.message });
+      remaining.push(entry);
+    }
+  }
+  if (remaining.length > 0) {
+    fs.writeFileSync(file, JSON.stringify({ accepts: remaining }, null, 2) + '\n', 'utf-8');
+  } else {
+    try { fs.rmSync(file, { force: true }); } catch {}
+  }
+  return { applied: results.filter((r) => r.ok).length, failed: results.filter((r) => !r.ok).length, results };
+}
+
+export function buildSvelteComponentCssAuthoring(count) {
+  const variantNumbers = Array.from({ length: count }, (_, i) => i + 1);
+  return {
+    mode: 'svelte-component',
+    styleTag: null,
+    strategy: 'component-style-block',
+    rulePattern: '.semantic-class { ... }',
+    selectorExamples: variantNumbers.map(() => '.expense-row { padding: 22px; }'),
+    requirements: [
+      'Write each variant as a real Svelte component file (v1.svelte, v2.svelte, ...).',
+      'Keep the prop names from propContract; bind dynamic text with {propName}, not literal snapshot text.',
+      'Put variant CSS in the component <style> block using semantic class selectors.',
+      'Author param-driven CSS against var(--p-<id>, default) and [data-p-<id>] using :global(...) so the runtime knob values reach the mounted root.',
+      'Declare params in componentDir/params.json keyed by variant number (e.g. {"1": [...], "2": [...]}), NOT as a data-impeccable-params attribute.',
+      'Do not use @scope or data-impeccable-variant selectors in component files.',
+      'Do not edit the route source file during generation; only edit files under componentDir.',
+    ],
+    forbidden: [
+      'Do not use @scope blocks in Svelte component variants.',
+      'Do not copy live DOM snapshot text into markup when propContract provides bindings.',
+      'Do not add data-impeccable-* attributes inside component files. Svelte parses { in attribute values as an expression, so data-impeccable-params with JSON breaks the build; use componentDir/params.json instead.',
+    ],
+    paramsFile: 'params.json',
+  };
+}

.claude/skills/impeccable/scripts/live-sveltekit-adapter.mjs

@@ -0,0 +1,274 @@
+/**
+ * SvelteKit live-mode adapter.
+ *
+ * SvelteKit must not be patched through src/app.html. That file is a document
+ * template, not framework-owned component chrome. The adapter keeps SvelteKit
+ * work limited to mounting a dev-only shadow host from +layout.svelte; the
+ * actual live UI remains the shared plain-DOM browser chrome.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+
+export const SVELTE_LIVE_ROOT_COMPONENT = 'src/lib/impeccable/ImpeccableLiveRoot.svelte';
+export const SVELTE_LAYOUT_MARKER_OPEN = '<!-- impeccable-live-svelte-start -->';
+export const SVELTE_LAYOUT_MARKER_CLOSE = '<!-- impeccable-live-svelte-end -->';
+export const SVELTE_ROOT_IMPORT = "import ImpeccableLiveRoot from '$lib/impeccable/ImpeccableLiveRoot.svelte';";
+
+export function detectSvelteKitProject(cwd = process.cwd(), config = null) {
+  const appHtml = findSvelteKitAppHtml(cwd, config);
+  if (!appHtml) return null;
+  const hasTemplateMarkers = fileIncludes(path.join(cwd, appHtml), '%sveltekit.body%')
+    && fileIncludes(path.join(cwd, appHtml), '%sveltekit.head%');
+  if (!hasTemplateMarkers) return null;
+
+  const hasSvelteConfig = fs.existsSync(path.join(cwd, 'svelte.config.js'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.mjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.cjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.ts'));
+  const hasKitPackage = packageHasSvelteKit(cwd);
+  if (!hasSvelteConfig && !hasKitPackage) return null;
+
+  return {
+    appHtml,
+    layoutFile: findSvelteKitLayout(cwd),
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function applySvelteKitLiveAdapter({ cwd = process.cwd(), port, config = null } = {}) {
+  if (!Number.isFinite(Number(port))) {
+    throw new Error('SvelteKit live adapter requires a numeric port');
+  }
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  ensureSvelteLiveRootComponent(cwd, Number(port));
+
+  const layoutRel = detected.layoutFile;
+  const layoutAbs = path.join(cwd, layoutRel);
+  fs.mkdirSync(path.dirname(layoutAbs), { recursive: true });
+  const layoutExisted = fs.existsSync(layoutAbs);
+  const before = layoutExisted ? fs.readFileSync(layoutAbs, 'utf-8') : defaultSvelteLayout();
+  const after = patchSvelteLayout(before);
+  fs.writeFileSync(layoutAbs, after, 'utf-8');
+
+  return {
+    file: layoutRel,
+    adapter: 'sveltekit',
+    inserted: after !== before || !layoutExisted,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function removeSvelteKitLiveAdapter({ cwd = process.cwd(), config = null } = {}) {
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  const layoutAbs = path.join(cwd, detected.layoutFile);
+  let removed = false;
+  if (fs.existsSync(layoutAbs)) {
+    const before = fs.readFileSync(layoutAbs, 'utf-8');
+    const after = unpatchSvelteLayout(before);
+    if (after !== before) {
+      fs.writeFileSync(layoutAbs, after, 'utf-8');
+      removed = true;
+    }
+  }
+
+  const rootAbs = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  if (fs.existsSync(rootAbs)) {
+    fs.rmSync(rootAbs, { force: true });
+    removed = true;
+  }
+
+  pruneEmptyDir(path.dirname(rootAbs), path.join(cwd, 'src'));
+
+  return {
+    file: detected.layoutFile,
+    adapter: 'sveltekit',
+    removed,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function patchSvelteLayout(content) {
+  let out = String(content || '');
+  if (!out.includes(SVELTE_ROOT_IMPORT)) {
+    const scriptMatch = out.match(/<script(?:\s[^>]*)?>/i);
+    if (scriptMatch) {
+      const insertAt = scriptMatch.index + scriptMatch[0].length;
+      out = out.slice(0, insertAt) + '\n  ' + SVELTE_ROOT_IMPORT + out.slice(insertAt);
+    } else {
+      out = `<script>\n  ${SVELTE_ROOT_IMPORT}\n</script>\n\n` + out;
+    }
+  }
+
+  if (!out.includes(SVELTE_LAYOUT_MARKER_OPEN)) {
+    const block = `${SVELTE_LAYOUT_MARKER_OPEN}\n<ImpeccableLiveRoot />\n${SVELTE_LAYOUT_MARKER_CLOSE}\n`;
+    const renderMatch = out.match(/\{@render\s+children(?:\?\.)?\(\)\s*\}/);
+    const slotMatch = out.match(/<slot\s*\/?>/);
+    const match = renderMatch || slotMatch;
+    if (match) {
+      out = out.slice(0, match.index) + block + out.slice(match.index);
+    } else {
+      out = out.replace(/\s*$/, '\n\n' + block);
+    }
+  }
+
+  return out;
+}
+
+export function unpatchSvelteLayout(content) {
+  let out = String(content || '');
+  const blockRe = new RegExp(
+    '([ \\t]*)' + escapeRegExp(SVELTE_LAYOUT_MARKER_OPEN)
+    + '\\n<ImpeccableLiveRoot\\s*/>\\n'
+    + escapeRegExp(SVELTE_LAYOUT_MARKER_CLOSE)
+    + '\\n?',
+    'g',
+  );
+  out = out.replace(blockRe, '$1');
+  out = out.replace(new RegExp('^\\s*' + escapeRegExp(SVELTE_ROOT_IMPORT) + '\\s*\\n?', 'gm'), '');
+  out = out.replace(/<script>\s*<\/script>\s*\n?/g, '');
+  return out.replace(/\n{3,}/g, '\n\n');
+}
+
+export function ensureSvelteLiveRootComponent(cwd, port) {
+  const file = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, buildSvelteLiveRootComponent(port), 'utf-8');
+  return file;
+}
+
+export function buildSvelteLiveRootComponent(port) {
+  return `<script>
+  import { onMount } from 'svelte';
+
+  const LIVE_URL = 'http://localhost:${Number(port)}/live.js';
+  const HOST_ID = 'impeccable-live-root';
+
+  onMount(() => {
+    let host = document.querySelector('impeccable-live-root#' + HOST_ID) || document.getElementById(HOST_ID);
+    if (!host) {
+      host = document.createElement('impeccable-live-root');
+      host.id = HOST_ID;
+      document.body.appendChild(host);
+    }
+
+    host.dataset.impeccableLiveAdapter = 'sveltekit';
+    host.style.setProperty('all', 'initial', 'important');
+    host.style.setProperty('display', 'block', 'important');
+    host.style.setProperty('position', 'fixed', 'important');
+    host.style.setProperty('top', '0', 'important');
+    host.style.setProperty('left', '0', 'important');
+    host.style.setProperty('width', '0', 'important');
+    host.style.setProperty('height', '0', 'important');
+    host.style.setProperty('overflow', 'visible', 'important');
+    host.style.setProperty('z-index', '2147483000', 'important');
+    host.style.setProperty('pointer-events', 'none', 'important');
+
+    const root = host.shadowRoot || host.attachShadow({ mode: 'open' });
+    if (!root.querySelector('style[data-impeccable-live-reset]')) {
+      const reset = document.createElement('style');
+      reset.dataset.impeccableLiveReset = 'true';
+      reset.textContent = ':host, :host *, * { box-sizing: border-box; }';
+      root.appendChild(reset);
+    }
+
+    window.__IMPECCABLE_LIVE_ADAPTER__ = 'sveltekit';
+    window.__IMPECCABLE_LIVE_UI_ROOT__ = root;
+    window.__IMPECCABLE_LIVE_CHROME_MOUNT__ = {
+      adapter: 'sveltekit',
+      version: 1,
+      host,
+      root,
+    };
+
+    const script = document.createElement('script');
+    script.src = LIVE_URL;
+    script.async = true;
+    script.dataset.impeccableLiveScript = 'true';
+    document.head.appendChild(script);
+
+    return () => {
+      script.remove();
+      if (window.__IMPECCABLE_LIVE_UI_ROOT__ === root) delete window.__IMPECCABLE_LIVE_UI_ROOT__;
+      if (window.__IMPECCABLE_LIVE_CHROME_MOUNT__?.root === root) delete window.__IMPECCABLE_LIVE_CHROME_MOUNT__;
+      if (window.__IMPECCABLE_LIVE_ADAPTER__ === 'sveltekit') delete window.__IMPECCABLE_LIVE_ADAPTER__;
+    };
+  });
+</script>
+`;
+}
+
+function findSvelteKitAppHtml(cwd, config) {
+  const files = Array.isArray(config?.files) ? config.files : ['src/app.html'];
+  for (const rel of files) {
+    if (rel.includes('*')) continue;
+    const normalized = rel.split(path.sep).join('/');
+    if (!normalized.endsWith('app.html')) continue;
+    const abs = path.join(cwd, normalized);
+    if (fs.existsSync(abs)) return normalized;
+  }
+  const fallback = 'src/app.html';
+  return fs.existsSync(path.join(cwd, fallback)) ? fallback : null;
+}
+
+function findSvelteKitLayout(cwd) {
+  const candidates = [
+    'src/routes/+layout.svelte',
+    'src/routes/(app)/+layout.svelte',
+  ];
+  for (const rel of candidates) {
+    if (fs.existsSync(path.join(cwd, rel))) return rel;
+  }
+  return 'src/routes/+layout.svelte';
+}
+
+function defaultSvelteLayout() {
+  return `<script>\n  let { children } = $props();\n</script>\n\n{@render children?.()}\n`;
+}
+
+function packageHasSvelteKit(cwd) {
+  const file = path.join(cwd, 'package.json');
+  if (!fs.existsSync(file)) return false;
+  try {
+    const pkg = JSON.parse(fs.readFileSync(file, 'utf-8'));
+    const deps = {
+      ...(pkg.dependencies || {}),
+      ...(pkg.devDependencies || {}),
+      ...(pkg.peerDependencies || {}),
+    };
+    return Boolean(deps['@sveltejs/kit'] || deps['@sveltejs/vite-plugin-svelte'] || deps.svelte);
+  } catch {
+    return false;
+  }
+}
+
+function fileIncludes(file, text) {
+  try {
+    return fs.readFileSync(file, 'utf-8').includes(text);
+  } catch {
+    return false;
+  }
+}
+
+function pruneEmptyDir(dir, stopDir) {
+  let current = dir;
+  while (current.startsWith(stopDir) && current !== stopDir) {
+    try {
+      if (fs.readdirSync(current).length > 0) return;
+      fs.rmdirSync(current);
+      current = path.dirname(current);
+    } catch {
+      return;
+    }
+  }
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}

.claude/skills/impeccable/scripts/live-ui-core.mjs

@@ -0,0 +1,179 @@
+/**
+ * Framework-neutral Impeccable live chrome contract.
+ *
+ * The production browser bundle is intentionally plain DOM so Svelte, React,
+ * Vue, and static adapters can all mount the same chrome. This module is the
+ * testable contract/inventory for that bundle; live-browser.js mirrors these
+ * values at runtime because it is served as a standalone script.
+ */
+
+export const LIVE_CHROME_MOUNT_CONTRACT = Object.freeze([
+  'root',
+  'transport',
+  'state',
+  'actions',
+]);
+
+export const LIVE_UI_SURFACES = Object.freeze([
+  {
+    key: 'global-bottom-bar',
+    ids: [
+      'impeccable-live-global-bar',
+      'impeccable-live-global-bar-brand',
+      'impeccable-live-pick-toggle',
+      'impeccable-live-insert-toggle',
+      'impeccable-live-detect-toggle',
+      'impeccable-live-detect-badge',
+      'impeccable-live-design-toggle',
+      'impeccable-live-page-chat',
+      'impeccable-live-page-chat-input',
+      'impeccable-live-page-chat-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'active', 'tooltip'],
+  },
+  {
+    key: 'pending-copy-edit-dock',
+    ids: ['impeccable-live-pending-dock'],
+    states: ['closed', 'open', 'hover', 'pressed', 'loading', 'rollback', 'keep-fixing'],
+  },
+  {
+    key: 'element-selection-chrome',
+    ids: [
+      'impeccable-live-highlight',
+      'impeccable-live-tooltip',
+      'impeccable-live-bar',
+      'impeccable-live-configure-input-wrap',
+      'impeccable-live-input',
+      'impeccable-live-configure-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'disabled'],
+  },
+  {
+    key: 'action-picker',
+    ids: ['impeccable-live-picker'],
+    states: ['closed', 'open', 'option-hover', 'option-focus'],
+  },
+  {
+    key: 'edit-chrome',
+    ids: ['impeccable-live-edit-badge'],
+    states: ['enabled', 'disabled', 'editing', 'cancel', 'save', 'edited-content'],
+  },
+  {
+    key: 'generating-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-shader'],
+    states: ['action-label', 'animated-dots', 'generating', 'done'],
+  },
+  {
+    key: 'variant-cycling-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-params-panel'],
+    states: ['variant-1', 'variant-2', 'variant-3', 'left-disabled', 'right-disabled', 'dot-click', 'accept', 'discard'],
+  },
+  {
+    key: 'variant-params-panel',
+    ids: ['impeccable-live-params-panel'],
+    states: ['closed', 'open-above', 'open-below', 'range', 'steps', 'toggle'],
+  },
+  {
+    key: 'saving-confirmed-rows',
+    ids: ['impeccable-live-bar'],
+    states: ['saving', 'applying-variant', 'confirmed'],
+  },
+  {
+    key: 'insert-mode-chrome',
+    ids: [
+      'impeccable-live-insert-line',
+      'impeccable-live-insert-placeholder',
+      'impeccable-live-placeholder-resize',
+      'impeccable-live-insert-input',
+      'impeccable-live-insert-voice',
+      'impeccable-live-insert-create',
+      'impeccable-live-insert-create-tooltip',
+    ],
+    states: ['toggle-active', 'line', 'placeholder', 'resize', 'enabled', 'disabled', 'tooltip'],
+  },
+  {
+    key: 'annotation-chrome',
+    ids: [
+      'impeccable-live-annot',
+      'impeccable-live-annot-svg',
+      'impeccable-live-annot-pins',
+      'impeccable-live-annot-clear',
+    ],
+    states: ['overlay', 'drawing', 'pin', 'pin-edit', 'clear'],
+  },
+  {
+    key: 'design-system-panel',
+    ids: ['impeccable-live-design-host'],
+    states: ['closed', 'open', 'tabs', 'token-tiles', 'copy'],
+  },
+  {
+    key: 'toasts-and-errors',
+    ids: ['impeccable-live-toast'],
+    states: ['normal', 'error', 'no-variants-mounted'],
+  },
+  {
+    key: 'css-isolation-boundary',
+    ids: ['impeccable-live-root'],
+    states: ['shadow-root', 'style-tags', 'hostile-css'],
+  },
+]);
+
+export const LIVE_UI_COMPONENT_IDS = Object.freeze([
+  ...new Set(LIVE_UI_SURFACES.flatMap((surface) => surface.ids)),
+]);
+
+export function resolveLiveUiRoot(env = globalThis) {
+  const doc = env?.document;
+  const explicit = env?.__IMPECCABLE_LIVE_UI_ROOT__
+    || env?.window?.__IMPECCABLE_LIVE_UI_ROOT__;
+  if (explicit && typeof explicit.appendChild === 'function') return explicit;
+  return doc?.body || null;
+}
+
+export function getLiveUiElementById(id, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (!id) return null;
+  if (root?.getElementById) {
+    const found = root.getElementById(id);
+    if (found) return found;
+  }
+  if (root?.querySelector) {
+    const found = root.querySelector('#' + escapeCssIdent(id));
+    if (found) return found;
+  }
+  return doc?.getElementById?.(id) || null;
+}
+
+export function appendToLiveUiRoot(el, env = globalThis) {
+  const root = resolveLiveUiRoot(env);
+  if (!root) throw new Error('Impeccable live UI root is not available');
+  root.appendChild(el);
+  return el;
+}
+
+export function appendStyleToLiveUiRoot(styleEl, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (root && root !== doc?.body) {
+    root.appendChild(styleEl);
+  } else {
+    (doc?.head || doc?.body || root).appendChild(styleEl);
+  }
+  return styleEl;
+}
+
+export function activeElementDeep(doc = globalThis.document) {
+  let active = doc?.activeElement || null;
+  while (active?.shadowRoot?.activeElement) {
+    active = active.shadowRoot.activeElement;
+  }
+  return active;
+}
+
+function escapeCssIdent(value) {
+  if (typeof CSS !== 'undefined' && typeof CSS.escape === 'function') {
+    return CSS.escape(String(value));
+  }
+  return String(value).replace(/([ !"#$%&'()*+,./:;<=>?@[\\\]^`{|}~])/g, '\\$1');
+}

.claude/skills/impeccable/scripts/live-wrap.mjs

@@ -15,6 +15,11 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -262,6 +267,8 @@ The agent should insert variant HTML at insertLine.`);
     .map((l) => (l.trim() === '' ? '' : indent + extra + l.slice(originalBaseIndent)))
     .join('\n');
   const originalIndented = reindentOriginal('    ');
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+  const useSvelteComponent = shouldUseSvelteComponentInjection(targetFile);
 
   // Wrapper attributes differ by syntax. HTML allows plain string attrs;
   // JSX requires object-literal style and parses string attrs as HTML (which
@@ -302,38 +309,75 @@ The agent should insert variant HTML at insertLine.`);
     indent + commentSyntax.open + ' impeccable-variants-end ' + id + ' ' + commentSyntax.close,
   ];
 
-  // Replace the original element with the wrapper
+  let outputFile = targetFile;
-  const newLines = [
+  let outputLines;
-    ...lines.slice(0, startLine),
+  let outputStartLine = startLine + 1;
-    ...wrapperLines,
+  let outputEndLine = startLine + wrapperLines.length + (originalLines.length - 1);
-    ...lines.slice(endLine + 1),
+  let insertLine;
-  ];
+  let svelteSession = null;
-  fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
 
-  // Calculate insert line (the "insert below this line" comment).
+  if (useSvelteComponent) {
-  // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // Svelte/SvelteKit resets component-local state on markup HMR updates.
-  // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // Keep generation source-neutral: agents write real variant components
-  // original-div + content + close-original-div; JSX: outer-div +
+    // under the generated componentDir, the browser mounts them into the live
-  // start-comment + Original-comment + original-div + content +
+    // DOM, and live-accept.mjs inlines the accepted variant back into the route.
-  // close-original-div). Multi-line originals push the marker by their
+    svelteSession = scaffoldSvelteComponentSession({
-  // extra line count.
+      id,
-  const insertLine = startLine + 6 + (originalLines.length - 1);
+      count,
+      sourceFile: relTargetFile,
+      sourceStartLine: startLine + 1,
+      sourceEndLine: endLine + 1,
+      originalLines,
+      cwd: process.cwd(),
+    });
+    outputFile = path.resolve(process.cwd(), svelteSession.manifestFile);
+    outputStartLine = 1;
+    outputEndLine = 1;
+    insertLine = 1;
+  } else {
+    // Replace the original element with the wrapper
+    const newLines = [
+      ...lines.slice(0, startLine),
+      ...wrapperLines,
+      ...lines.slice(endLine + 1),
+    ];
+    fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
+
+    // Calculate insert line (the "insert below this line" comment).
+    // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // original-div + content + close-original-div; JSX: outer-div +
+    // start-comment + Original-comment + original-div + content +
+    // close-original-div). Multi-line originals push the marker by their
+    // extra line count.
+    insertLine = startLine + 6 + (originalLines.length - 1) + 1;
+  }
+
+  const outputRelFile = path.relative(process.cwd(), outputFile).split(path.sep).join('/');
+
+  const svelteComponentAuthoring = useSvelteComponent ? buildSvelteComponentCssAuthoring(count) : null;
 
   console.log(JSON.stringify({
-    file: path.relative(process.cwd(), targetFile),
+    file: outputRelFile,
-    startLine: startLine + 1,       // 1-indexed for the agent
+    sourceFile: useSvelteComponent ? relTargetFile : undefined,
+    previewMode: useSvelteComponent ? 'svelte-component' : undefined,
+    componentDir: svelteSession?.componentDir,
+    propContract: svelteSession?.propContract,
+    sourceStartLine: useSvelteComponent ? startLine + 1 : undefined,
+    sourceEndLine: useSvelteComponent ? endLine + 1 : undefined,
+    startLine: outputStartLine,       // 1-indexed for the agent
     // wrapperLines is an array but one element (the original-content slot)
     // is a `\n`-joined multi-line string, so the actual file-row count is
     // wrapperLines.length + (originalLines.length - 1). Without the offset,
     // endLine pointed inside the wrapper for any picked element that
     // spanned more than one source line.
-    endLine: startLine + wrapperLines.length + (originalLines.length - 1), // 1-indexed
+    endLine: outputEndLine, // 1-indexed
-    insertLine: insertLine + 1,     // 1-indexed: where variants go
+    insertLine,            // 1-indexed: where variants go
     commentSyntax: commentSyntax,
-    styleMode: styleMode.mode,
+    styleMode: useSvelteComponent ? 'svelte-component' : styleMode.mode,
-    styleTag: styleMode.styleTag,
+    styleTag: useSvelteComponent ? null : styleMode.styleTag,
-    cssSelectorPrefixExamples: buildCssSelectorPrefixExamples(styleMode.mode, count),
+    cssSelectorPrefixExamples: useSvelteComponent ? [] : buildCssSelectorPrefixExamples(styleMode.mode, count),
-    cssAuthoring: buildCssAuthoring(styleMode, count),
+    cssAuthoring: useSvelteComponent ? svelteComponentAuthoring : buildCssAuthoring(styleMode, count),
     originalLineCount: originalLines.length,
   }));
 }
@@ -527,6 +571,14 @@ function splitClassList(classes) {
   return String(classes).split(/[,\s]+/).map(c => c.trim()).filter(Boolean);
 }
 
+function attrEscapeDouble(str) {
+  return String(str)
+    .replace(/&/g, '&')
+    .replace(/"/g, '"')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;');
+}
+
 function detectCommentSyntax(filePath) {
   const ext = path.extname(filePath).toLowerCase();
   if (ext === '.jsx' || ext === '.tsx') {

.cursor/skills/impeccable/reference/live.md

@@ -111,7 +111,9 @@ node .cursor/skills/impeccable/scripts/live-insert.mjs --id EVENT_ID --count EVE
 
 The scaffold has **no** `data-impeccable-variant="original"`. Variants are net-new HTML+CSS inserted at `insertLine`. Load `brand.md` or `product.md` (freeform only, no action sub-command). Write all variants in one edit, then `--reply done`.
 
-On accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
+For Svelte/SvelteKit targets, `live-insert.mjs` returns `previewMode: "svelte-component"` with `mode: "insert"`, `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each inserted variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`. Insert variants must be non-empty net-new content with a single top-level root, no `data-impeccable-*` attributes, and CSS in each component's `<style>` block. Do **not** edit the route source during generation; the browser mounts the temporary component before/after the live anchor while the user cycles variants. On Accept, `live-accept.mjs` inserts the selected component markup into `sourceFile` immediately and deletes the temp session after the source write succeeds.
+
+For non-Svelte targets, on accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
 
 ### Replace mode (default)
 
@@ -149,6 +151,25 @@ If `--text` matches multiple candidates equally well, wrap exits with `{ error:
 
 Output on success: `{ file, insertLine, commentSyntax, styleMode, styleTag, cssSelectorPrefixExamples, cssAuthoring }`.
 
+For Svelte/SvelteKit targets, `live-wrap.mjs` returns `previewMode: "svelte-component"` with `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`; use the `propContract` prop names for dynamic text (`{propName}`), not literal snapshot strings. Put variant CSS in each component's `<style>` block with semantic class selectors (no `@scope`, no `data-impeccable-*`). Reply with `--file` set to the manifest path; the browser dynamically imports and mounts the compiled components so Svelte HMR does not reset page state while the user cycles variants. On Accept, `live-accept.mjs` inlines the accepted component back into `sourceFile` immediately after source promotion succeeds.
+
+**Params on the Svelte component path go in a sidecar, never as an attribute.** Svelte parses `{` inside an attribute value as the start of an expression, so a `data-impeccable-params='[{…}]'` attribute on a component element fails to compile (`Expected token }`). Declare params for this path in `componentDir/params.json`, keyed by variant number, using the exact param schema from section 7:
+
+```json
+{
+  "1": [
+    {"id":"density","kind":"steps","default":"snug","label":"Density","options":[
+      {"value":"airy","label":"Airy"},{"value":"snug","label":"Snug"},{"value":"packed","label":"Packed"}
+    ]}
+  ],
+  "2": [
+    {"id":"accent","kind":"range","min":0,"max":1,"step":0.05,"default":0.5,"label":"Accent"}
+  ]
+}
+```
+
+Author the component `<style>` against `var(--p-<id>, default)` for `range`/`toggle` and `[data-p-<id>="…"]` for `steps`; wrap those selectors in `:global(...)` so the knob values the runtime sets on the mounted root reach your rules. The browser reads `params.json`, docks the panel, and drives `--p-*` / `data-p-*` on the mounted component exactly as it does for the HTML/JSX path.
+
 `styleMode` controls how preview CSS must be authored. Treat it as a detected capability mode, not a framework guess:
 
 - `scoped`: use `@scope ([data-impeccable-variant="N"])` rules.
@@ -340,7 +361,7 @@ Each variant can expose **coarse** knobs alongside the full HTML/CSS replacement
 
 **Hard cap per variant**: at most **four** parameters so the panel stays legible; rare fifth only if the reference explicitly allows it.
 
-**How to declare.** Put a JSON manifest on the variant wrapper:
+**How to declare.** Put a JSON manifest on the variant wrapper (HTML/JSX path). **On the Svelte `svelte-component` path, do not use this attribute** (Svelte can't compile `{` inside an attribute value). Declare params in `componentDir/params.json` keyed by variant number instead (see the Svelte component paragraph in the wrap section). The param schema below is identical for both paths.
 
 ```html
 <div data-impeccable-variant="1" data-impeccable-params='[
@@ -454,7 +475,7 @@ Do these five steps in the current thread, synchronously, before the next poll.
 1. **Locate the carbonize block** in the source file (`_acceptResult.file`). It's bracketed by `<!-- impeccable-carbonize-start SESSION_ID -->` and `<!-- impeccable-carbonize-end SESSION_ID -->` and contains a `<style data-impeccable-css="SESSION_ID">` element. If the variant declared parameters, an `<!-- impeccable-param-values SESSION_ID: {...} -->` comment sits alongside the style tag with the user's chosen values; read it first; it drives steps 3 and 4 below.
 2. **Move the CSS rules** into the project's real stylesheet. Which stylesheet depends on the project (e.g. `site/styles/workflow.css` for an Astro project, or the component's co-located CSS file for a Vite/Next project; pick whichever already owns styling for the surrounding element).
 3. **Bake in parameter values while rewriting selectors.** For `@scope ([data-impeccable-variant="N"])` wrappers: retarget to real, semantic classes on the accepted HTML (`.why-visual--v2 .v2-label { … }`). For `:scope[data-p-<id>="VALUE"]` selectors: keep only the branch matching the chosen value from the param-values comment; drop the others (they're dead after accept). For `var(--p-<id>, DEFAULT)` in the CSS: either substitute the literal value, or if the param is still useful as a knob going forward, leave the var and update its initial declaration to the chosen value.
-4. **Unwrap the accepted content.** Delete the `<div data-impeccable-variant="N" style="display: contents">` that wraps it. Drop `data-impeccable-params` and any `data-p-*` attributes from it; those are live-mode plumbing, not source.
+4. **Unwrap the accepted content.** Delete the inner `<div data-impeccable-variant="N" style="display: contents">` that wraps it. On JSX/TSX, also delete the outer `<div data-impeccable-carbonize="SESSION_ID" style={{ display: 'contents' }}>` wrapper if present (accept adds it so ternary/`return` slots keep a single root). Drop `data-impeccable-params` and any `data-p-*` attributes; those are live-mode plumbing, not source.
 5. **Delete the inline `<style>` block, the `<!-- impeccable-param-values -->` comment if present, and both `<!-- impeccable-carbonize-start/end -->` markers.** Also drop any `@scope` rules for variants other than the accepted one; those are dead code now.
 
 After the file is clean, run `live-complete.mjs --id SESSION_ID`, verify it reports `phase: "completed"`, then poll again.

.cursor/skills/impeccable/scripts/live-accept.mjs

@@ -17,6 +17,12 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer, writeBuffer as writeManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  findSvelteComponentManifest,
+  inlineSvelteComponentAccept,
+  removeSvelteComponentSession,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -41,6 +47,9 @@ Required:
 
 Options:
   --page-url URL     Current browser page URL; scopes staged copy-edit cleanup
+  --defer-source-write
+                     Deprecated compatibility flag. Svelte component accepts
+                     now write the real source immediately.
 
 Output (JSON):
   { handled, file, carbonize }`);
@@ -64,18 +73,67 @@ Output (JSON):
 
   // Find the file containing this session's markers
   const found = findSessionFile(id, process.cwd());
-  if (!found) {
+  const svelteComponentManifest = found ? null : findSvelteComponentManifest(id, process.cwd());
+
+  if (!found && !svelteComponentManifest) {
     console.log(JSON.stringify({ handled: false, error: 'Session markers not found for id: ' + id }));
     process.exit(0);
   }
 
+  if (svelteComponentManifest) {
+    if (isDiscard) {
+      removeSvelteComponentSession(id, process.cwd());
+      console.log(JSON.stringify({
+        handled: true,
+        file: svelteComponentManifest.sourceFile,
+        carbonize: false,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      }));
+      return;
+    }
+
+    let result;
+    try {
+      result = inlineSvelteComponentAccept(
+        svelteComponentManifest,
+        variantNum,
+        paramValues,
+        process.cwd(),
+      );
+    } catch (err) {
+      result = {
+        handled: false,
+        error: err.message,
+        file: svelteComponentManifest.sourceFile,
+        sourceFile: svelteComponentManifest.sourceFile,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      };
+    }
+    if (result.carbonize) {
+      result.todo = 'REQUIRED before next poll: carbonize cleanup in ' + result.file + '. See reference/live.md "Required after accept".';
+    }
+    console.log(JSON.stringify({ handled: result.handled !== false, ...result }));
+    return;
+  }
+
   const { file: targetFile, content, lines } = found;
   const relFile = path.relative(process.cwd(), targetFile);
+  const previewBlock = findMarkerBlock(id, lines);
+  const sourceShadowPreview = previewBlock
+    ? readSourceShadowPreviewMeta(content, id)
+    : null;
+
+  if (sourceShadowPreview) {
+    console.log(JSON.stringify({
+      handled: false,
+      error: 'source_shadow_preview_deprecated',
+      hint: 'Svelte live mode now uses svelte-component injection. Re-wrap the element and regenerate variants.',
+    }));
+    process.exit(0);
+  }
 
-  // Bail if the session lives in a generated file. The agent manually wrote
-  // the wrapper there for preview, and is responsible for writing the
-  // accepted variant to true source (or cleaning up on discard). See
-  // "Handle fallback" in live.md.
   if (isGeneratedFile(targetFile, { cwd: process.cwd() })) {
     console.log(JSON.stringify({
       handled: false,
@@ -207,6 +265,71 @@ function handleDiscard(id, lines, targetFile) {
 // Accept
 // ---------------------------------------------------------------------------
 
+/**
+ * Build carbonize stitch-in lines. JSX targets occupy a single child slot
+ * (ternary branch, return value, etc.) — the same constraint as live-wrap.
+ * When isJsx, tuck markers + <style> + variant wrapper inside one outer
+ * <div data-impeccable-carbonize> so the slot keeps a single root node.
+ */
+function buildCarbonizeReplacement({
+  indent,
+  commentSyntax,
+  isJsx,
+  id,
+  variantNum,
+  cssContent,
+  paramValues,
+  restored,
+}) {
+  const lines = [];
+  if (!cssContent) {
+    lines.push(...restored);
+    return lines;
+  }
+
+  const variantStyleAttr = isJsx
+    ? "style={{ display: 'contents' }}"
+    : 'style="display: contents"';
+
+  const pushCarbonizeBody = (bodyIndent) => {
+    const bodyRestored = reindentContent(restored, indent, bodyIndent + '  ');
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    for (const cssLine of cssContent) {
+      lines.push(bodyIndent + cssLine.trimStart());
+    }
+    lines.push(bodyIndent + (isJsx ? '`}</style>' : '</style>'));
+    if (paramValues && Object.keys(paramValues).length > 0) {
+      lines.push(
+        bodyIndent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close,
+      );
+    }
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<div data-impeccable-variant="' + variantNum + '" ' + variantStyleAttr + '>');
+    lines.push(...bodyRestored);
+    lines.push(bodyIndent + '</div>');
+  };
+
+  if (isJsx) {
+    const wrapperStyle = 'style={{ display: "contents" }}';
+    lines.push(indent + '<div data-impeccable-carbonize="' + id + '" ' + wrapperStyle + '>');
+    pushCarbonizeBody(indent + '  ');
+    lines.push(indent + '</div>');
+  } else {
+    pushCarbonizeBody(indent);
+  }
+
+  return lines;
+}
+
+function reindentContent(contentLines, fromIndent, toIndent) {
+  return contentLines.map((line) => {
+    if (line.trim() === '') return '';
+    if (line.startsWith(fromIndent)) return toIndent + line.slice(fromIndent.length);
+    return toIndent + line.trimStart();
+  });
+}
+
 function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const block = findMarkerBlock(id, lines);
   if (!block) return { handled: false, error: 'Markers not found' };
@@ -235,45 +358,17 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const hasHelperAttrs = variantText.includes('data-impeccable-variant');
   const needsCarbonize = !!(cssContent || hasHelperAttrs);
 
-  // Build the replacement
   const restored = deindentContent(variantContent, indent);
-  const replacement = [];
+  const replacement = buildCarbonizeReplacement({
-
+    indent,
-  if (cssContent) {
+    commentSyntax,
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    isJsx,
-    // JSX targets need the CSS body wrapped in a template literal so that the
+    id,
-    // `{` and `}` in CSS rules don't get parsed as JSX expressions.
+    variantNum,
-    replacement.push(indent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    cssContent,
-    // Re-indent CSS content to match
+    paramValues,
-    for (const cssLine of cssContent) {
+    restored,
-      replacement.push(indent + cssLine.trimStart());
+  });
-    }
-    replacement.push(indent + (isJsx ? '`}</style>' : '</style>'));
-    if (paramValues && Object.keys(paramValues).length > 0) {
-      // Preserve the user's knob positions for the carbonize-cleanup agent
-      // to bake into the final CSS when it collapses scoped rules.
-      replacement.push(indent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close);
-    }
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
-  }
-
-  // Keep the `@scope ([data-impeccable-variant="N"])` selectors in the
-  // carbonize CSS block working visually by re-wrapping the accepted content
-  // in a data-impeccable-variant="N" div with `display: contents` (so layout
-  // isn't affected). The carbonize agent strips this attribute + wrapper when
-  // it moves the CSS to a proper stylesheet.
-  //
-  // Style attribute syntax has to follow the host file's flavor — JSX files
-  // need the object form, otherwise React 19 throws "Failed to set indexed
-  // property [0] on CSSStyleDeclaration" while parsing the string char-by-char.
-  if (cssContent) {
-    const styleAttr = isJsx ? "style={{ display: 'contents' }}" : 'style="display: contents"';
-    replacement.push(indent + '<div data-impeccable-variant="' + variantNum + '" ' + styleAttr + '>');
-    replacement.push(...restored);
-    replacement.push(indent + '</div>');
-  } else {
-    replacement.push(...restored);
-  }
 
   const newLines = [
     ...lines.slice(0, replaceRange.start),
@@ -285,6 +380,34 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   return { carbonize: needsCarbonize, acceptedOriginalText: originalContent.join('\n') };
 }
 
+function readSourceShadowPreviewMeta(content, id) {
+  const escaped = escapeRegExp(id);
+  const wrapperRe = new RegExp('<[^>]+data-impeccable-variants=(["\'])' + escaped + '\\1[^>]*>');
+  const match = String(content || '').match(wrapperRe);
+  if (!match) return null;
+  const tag = match[0];
+  if (readHtmlAttr(tag, 'data-impeccable-preview') !== 'source-shadow') return null;
+  const sourceFile = readHtmlAttr(tag, 'data-impeccable-source-file');
+  const sourceStartLine = Number(readHtmlAttr(tag, 'data-impeccable-source-start'));
+  const sourceEndLine = Number(readHtmlAttr(tag, 'data-impeccable-source-end'));
+  if (!sourceFile || !Number.isFinite(sourceStartLine) || !Number.isFinite(sourceEndLine)) return null;
+  return { sourceFile, sourceStartLine, sourceEndLine };
+}
+
+function readHtmlAttr(tag, name) {
+  const match = String(tag || '').match(new RegExp('\\s' + escapeRegExp(name) + '\\s*=\\s*(["\'])(.*?)\\1'));
+  if (!match) return null;
+  return decodeHtmlAttr(match[2]);
+}
+
+function decodeHtmlAttr(value) {
+  return String(value || '')
+    .replace(/&quot;/g, '"')
+    .replace(/&lt;/g, '<')
+    .replace(/&gt;/g, '>')
+    .replace(/&amp;/g, '&');
+}
+
 // ---------------------------------------------------------------------------
 // Parsing helpers
 // ---------------------------------------------------------------------------
@@ -686,4 +809,4 @@ if (_running?.endsWith('live-accept.mjs') || _running?.endsWith('live-accept.mjs
   acceptCli();
 }
 
-export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock };
+export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock, applyDeferredSvelteComponentAccepts };

.cursor/skills/impeccable/scripts/live-completion.mjs

@@ -3,6 +3,7 @@ export function completionTypeForAcceptResult(eventType, acceptResult) {
   if (acceptResult?.handled === true && acceptResult?.carbonize === true) return 'agent_done';
   if (acceptResult?.handled === true) return 'complete';
   if (acceptResult?.mode === 'error') return 'error';
+  if (eventType === 'accept' && acceptResult?.previewMode === 'svelte-component') return 'error';
   return 'agent_done';
 }
 

.cursor/skills/impeccable/scripts/live-inject.mjs

@@ -17,11 +17,38 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { resolveLiveConfigPath } from './impeccable-paths.mjs';
+import {
+  applySvelteKitLiveAdapter,
+  detectSvelteKitProject,
+  removeSvelteKitLiveAdapter,
+} from './live-sveltekit-adapter.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const CONFIG_PATH = resolveLiveConfigPath({ cwd: process.cwd(), scriptsDir: __dirname });
 const MARKER_OPEN_TEXT = 'impeccable-live-start';
 const MARKER_CLOSE_TEXT = 'impeccable-live-end';
+const IGNORE_MARKER_OPEN = '# impeccable-live-ignore-start';
+const IGNORE_MARKER_CLOSE = '# impeccable-live-ignore-end';
+
+export const LIVE_IGNORE_PATTERNS = Object.freeze([
+  '.impeccable/hook.cache.json',
+  '.impeccable/live/server.json',
+  '.impeccable/live/sessions/',
+  '.impeccable/live/previews/',
+  '.impeccable/live/annotations/',
+  '.impeccable/live/cache/',
+  '.impeccable/live/manual-edit-apply-transaction.json',
+  '.impeccable/live/manual-edit-events.jsonl',
+  '.impeccable/live/manual-edit-evidence/',
+  '.impeccable/live/pending-manual-edits.json',
+  '.impeccable/live/deferred-svelte-component-accepts.json',
+  '.impeccable-live.json',
+  '.impeccable-live/',
+  'node_modules/.impeccable-live/',
+  'src/lib/impeccable/ImpeccableLiveRoot.svelte',
+  'src/lib/impeccable/__runtime.js',
+  'src/lib/impeccable/[0-9a-f]*/',
+]);
 
 /**
  * Hard-excluded directory patterns. These are NEVER user-facing pages and
@@ -83,8 +110,14 @@ Output (JSON):
   validateConfig(config);
 
   const resolvedFiles = resolveFiles(process.cwd(), config);
+  const svelteKit = detectSvelteKitProject(process.cwd(), config);
 
   if (args.includes('--remove')) {
+    if (svelteKit) {
+      const adapterResult = removeSvelteKitLiveAdapter({ cwd: process.cwd(), config });
+      console.log(JSON.stringify({ ok: true, adapter: 'sveltekit', results: [adapterResult] }));
+      return;
+    }
     const results = resolvedFiles.map((relFile) => {
       const absFile = path.resolve(process.cwd(), relFile);
       if (!fs.existsSync(absFile)) return { file: relFile, error: 'file_not_found' };
@@ -110,6 +143,13 @@ Output (JSON):
     console.error(JSON.stringify({ ok: false, error: 'missing_port' }));
     process.exit(1);
   }
+  const gitIgnore = ensureLiveGitIgnores(process.cwd());
+
+  if (svelteKit) {
+    const adapterResult = applySvelteKitLiveAdapter({ cwd: process.cwd(), port, config });
+    console.log(JSON.stringify({ ok: true, port, adapter: 'sveltekit', gitIgnore, results: [adapterResult] }));
+    return;
+  }
 
   const results = resolvedFiles.map((relFile) => {
     const absFile = path.resolve(process.cwd(), relFile);
@@ -129,10 +169,68 @@ Output (JSON):
     };
   });
   const anyInserted = results.some((r) => r.inserted);
-  console.log(JSON.stringify({ ok: anyInserted, port, results }));
+  console.log(JSON.stringify({ ok: anyInserted, port, gitIgnore, results }));
   if (!anyInserted) process.exit(1);
 }
 
+export function ensureLiveGitIgnores(cwd = process.cwd()) {
+  const target = resolveIgnoreTarget(cwd);
+  const existing = fs.existsSync(target.path) ? fs.readFileSync(target.path, 'utf-8') : '';
+  const block = [
+    IGNORE_MARKER_OPEN,
+    ...LIVE_IGNORE_PATTERNS,
+    IGNORE_MARKER_CLOSE,
+  ].join('\n');
+  const markerRe = new RegExp(`${escapeRegExp(IGNORE_MARKER_OPEN)}[\\s\\S]*?${escapeRegExp(IGNORE_MARKER_CLOSE)}`);
+
+  let updated;
+  if (markerRe.test(existing)) {
+    updated = existing.replace(markerRe, block);
+  } else {
+    const prefix = existing.length === 0 ? '' : existing.endsWith('\n') ? existing : existing + '\n';
+    updated = `${prefix}${prefix.endsWith('\n\n') || prefix === '' ? '' : '\n'}${block}\n`;
+  }
+
+  if (updated !== existing) {
+    fs.mkdirSync(path.dirname(target.path), { recursive: true });
+    fs.writeFileSync(target.path, updated, 'utf-8');
+  }
+
+  return {
+    file: path.relative(cwd, target.path).split(path.sep).join('/'),
+    mode: target.mode,
+    changed: updated !== existing,
+    patterns: [...LIVE_IGNORE_PATTERNS],
+  };
+}
+
+function resolveIgnoreTarget(cwd) {
+  const gitExcludePath = resolveGitInfoExcludePath(cwd);
+  if (gitExcludePath) {
+    return { path: gitExcludePath, mode: 'git-info-exclude' };
+  }
+  return { path: path.join(cwd, '.gitignore'), mode: 'gitignore' };
+}
+
+function resolveGitInfoExcludePath(cwd) {
+  const dotGit = path.join(cwd, '.git');
+  if (!fs.existsSync(dotGit)) return null;
+
+  const stat = fs.statSync(dotGit);
+  if (stat.isDirectory()) return path.join(dotGit, 'info', 'exclude');
+  if (!stat.isFile()) return null;
+
+  const body = fs.readFileSync(dotGit, 'utf-8').trim();
+  const match = body.match(/^gitdir:\s*(.+)$/i);
+  if (!match) return null;
+  const gitDir = path.isAbsolute(match[1]) ? match[1] : path.resolve(cwd, match[1]);
+  return path.join(gitDir, 'info', 'exclude');
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
 /**
  * Expand config.files (which may contain glob patterns) into a literal list
  * of existing file paths relative to rootDir. Literal entries pass through;

.cursor/skills/impeccable/scripts/live-insert.mjs

@@ -21,6 +21,11 @@ import {
   buildCssAuthoring,
   buildCssSelectorPrefixExamples,
 } from './live-wrap.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentInsertSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const INSERT_POSITIONS = new Set(['before', 'after']);
 
@@ -192,6 +197,41 @@ Output (JSON):
   const styleMode = detectStyleMode(targetFile);
   const isJsx = commentSyntax.open === '{/*';
   const spliceIndex = computeInsertLine(startLine, endLine, position);
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+
+  if (shouldUseSvelteComponentInjection(targetFile)) {
+    const session = scaffoldSvelteComponentInsertSession({
+      id,
+      count,
+      sourceFile: relTargetFile,
+      insertLine: spliceIndex + 1,
+      position,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      anchorLines: lines.slice(startLine, endLine + 1),
+      cwd: process.cwd(),
+    });
+    console.log(JSON.stringify({
+      mode: 'insert',
+      position,
+      file: session.manifestFile,
+      sourceFile: relTargetFile,
+      previewMode: 'svelte-component',
+      componentDir: session.componentDir,
+      propContract: session.propContract,
+      insertLine: 1,
+      sourceInsertLine: spliceIndex + 1,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      commentSyntax,
+      styleMode: 'svelte-component',
+      styleTag: null,
+      cssSelectorPrefixExamples: [],
+      cssAuthoring: buildSvelteComponentCssAuthoring(count),
+    }));
+    return;
+  }
+
   const indent = lines[spliceIndex]?.match(/^(\s*)/)?.[1]
     ?? lines[startLine]?.match(/^(\s*)/)?.[1]
     ?? '';
@@ -216,7 +256,7 @@ Output (JSON):
   console.log(JSON.stringify({
     mode: 'insert',
     position,
-    file: path.relative(process.cwd(), targetFile),
+    file: relTargetFile,
     insertLine: insertLine + 1,
     commentSyntax,
     styleMode: styleMode.mode,

.cursor/skills/impeccable/scripts/live-poll.mjs

@@ -20,6 +20,7 @@ import { readLiveServerInfo } from './impeccable-paths.mjs';
 // that ceiling and loop in `pollOnce` to synthesize a long poll without
 // depending on the standalone undici package.
 export const PER_REQUEST_TIMEOUT_MS = 270_000;
+export const DEFAULT_EVENT_LEASE_MS = 600_000;
 
 const EVENT_TYPES_NEEDING_AGENT_REPLY = new Set(['generate', 'steer', 'manual_edit_apply']);
 
@@ -156,7 +157,7 @@ export async function fetchNextEvent(base, token, { totalDeadline } = {}) {
       ? totalDeadline - Date.now()
       : PER_REQUEST_TIMEOUT_MS;
     const slice = Math.min(Math.max(remaining, 1000), PER_REQUEST_TIMEOUT_MS);
-    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}`);
+    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}&leaseMs=${DEFAULT_EVENT_LEASE_MS}`);
 
     if (res.status === 401) {
       const err = new Error('Authentication failed. The server token may have changed.');
@@ -317,7 +318,7 @@ Modes:
 Options:
   --timeout=MS        One-shot poll timeout in ms (default: 600000). Ignored in --stream mode
   --ack-timeout=MS    Stream mode: max wait for --reply after generate/steer (default: 600000)
-  --file PATH         Attach a source file path to the reply (generate flow)
+  --file PATH         Attach a source file path to the reply (generate/steer flow)
   --data JSON         Attach a JSON result object to the reply (manual_edit_apply flow). Must be valid JSON
   --help              Show this help message
 

.cursor/skills/impeccable/scripts/live-server.mjs

@@ -42,6 +42,10 @@ import {
 } from './live-manual-edits-buffer.mjs';
 import { buildManualEditEvidence } from './live-manual-edit-evidence.mjs';
 import { commitManualEdits } from './live-commit-manual-edits.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  removeAllSvelteComponentSessions,
+} from './live-svelte-component.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 // PRODUCT.md / DESIGN.md live wherever context.mjs resolves. The generated
@@ -103,6 +107,7 @@ const MIN_MANUAL_EDIT_APPLY_CHUNK_SIZE = 1;
 const MAX_MANUAL_EDIT_APPLY_CHUNK_SIZE = 20;
 const MANUAL_APPLY_COMPACT_TEXT_LIMIT = 240;
 const MANUAL_APPLY_COMPACT_NEARBY_LIMIT = 4;
+const POLL_LEASE_EXPIRY_TIMER_GRACE_MS = 2;
 const DEBUG_MANUAL_EDIT_EVENTS = /^(1|true|yes)$/i.test(process.env.IMPECCABLE_LIVE_DEBUG_EVENTS || '');
 
 function tombstoneTimedOutApplyId(eventId, details = {}) {
@@ -897,6 +902,8 @@ function leaseEvent(entry, leaseMs) {
     return entry.event;
   }
   entry.leaseUntil = Date.now() + leaseMs;
+  scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return entry.event;
 }
 
@@ -907,9 +914,16 @@ function acknowledgePendingEvent(id) {
   const acknowledged = state.pendingEvents[idx].event;
   state.pendingEvents.splice(idx, 1);
   scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return acknowledged;
 }
 
+function findPendingEventById(id) {
+  if (!id) return null;
+  const entry = state.pendingEvents.find((item) => item.event?.id === id);
+  return entry?.event || null;
+}
+
 function manualApplyReplyCommand(eventOrId = 'EVENT_ID') {
   const id = typeof eventOrId === 'string' ? eventOrId : eventOrId?.id || 'EVENT_ID';
   return `live-poll.mjs --reply ${id} done --data '<json>'`;
@@ -955,6 +969,42 @@ function summarizePendingEventForStatus(entry) {
   return summary;
 }
 
+function summarizeActiveSessionForClient(snapshot = {}) {
+  return {
+    id: snapshot.id,
+    phase: snapshot.phase,
+    pageUrl: snapshot.pageUrl ?? null,
+    sourceFile: snapshot.sourceFile ?? null,
+    previewFile: snapshot.previewFile ?? null,
+    previewMode: snapshot.previewMode ?? null,
+    expectedVariants: snapshot.expectedVariants ?? 0,
+    arrivedVariants: snapshot.arrivedVariants ?? 0,
+    visibleVariant: snapshot.visibleVariant ?? null,
+    checkpointRevision: snapshot.checkpointRevision ?? 0,
+    paramValues: snapshot.paramValues || {},
+  };
+}
+
+function activeSessionSummaries() {
+  if (!state.sessionStore) return [];
+  return state.sessionStore.listActiveSessions().map((snapshot) => summarizeActiveSessionForClient(snapshot));
+}
+
+function cancelQueuedAnonymousExitEvents() {
+  let removed = 0;
+  for (let i = state.pendingEvents.length - 1; i >= 0; i -= 1) {
+    const event = state.pendingEvents[i]?.event;
+    if (event?.type !== 'exit' || event.id) continue;
+    state.pendingEvents.splice(i, 1);
+    removed += 1;
+  }
+  if (removed > 0) {
+    scheduleLeaseFlush();
+    broadcastAgentPollingIfChanged();
+  }
+  return removed;
+}
+
 function cancelPendingManualApplyEvents(pageUrl, reason = 'manual_edit_discarded') {
   const canceledById = new Map();
   const shouldCancel = (event) => event?.type === 'manual_edit_apply' && (!pageUrl || event.pageUrl === pageUrl);
@@ -1001,7 +1051,6 @@ function scheduleLeaseFlush() {
     clearTimeout(state.leaseTimer);
     state.leaseTimer = null;
   }
-  if (state.pendingPolls.length === 0) return;
   const now = Date.now();
   const nextLeaseUntil = state.pendingEvents
     .map((entry) => entry.leaseUntil || 0)
@@ -1011,7 +1060,8 @@ function scheduleLeaseFlush() {
   state.leaseTimer = setTimeout(() => {
     state.leaseTimer = null;
     flushPendingPolls();
-  }, Math.max(0, nextLeaseUntil - now));
+    broadcastAgentPollingIfChanged();
+  }, Math.max(0, nextLeaseUntil - now + POLL_LEASE_EXPIRY_TIMER_GRACE_MS));
 }
 
 function flushPendingPolls() {
@@ -1032,7 +1082,9 @@ function flushPendingPolls() {
 }
 
 function agentPollingConnected() {
-  return state.pendingPolls.length > 0;
+  const now = Date.now();
+  return state.pendingPolls.length > 0
+    || state.pendingEvents.some((entry) => entry.leaseUntil && entry.leaseUntil > now);
 }
 
 function broadcastAgentPollingIfChanged() {
@@ -1318,7 +1370,7 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/status') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401, { 'Content-Type': 'application/json' }); res.end(JSON.stringify({ error: 'Unauthorized' })); return; }
-      const sessions = state.sessionStore ? state.sessionStore.listActiveSessions() : [];
+      const sessions = activeSessionSummaries();
       res.writeHead(200, { 'Content-Type': 'application/json' });
       res.end(JSON.stringify({
         status: 'ok',
@@ -1423,6 +1475,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/events' && req.method === 'GET') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401); res.end('Unauthorized'); return; }
+      clearTimeout(state.exitTimer);
+      state.exitTimer = null;
+      cancelQueuedAnonymousExitEvents();
       res.writeHead(200, {
         'Content-Type': 'text/event-stream',
         'Cache-Control': 'no-cache',
@@ -1432,10 +1487,10 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
         type: 'connected',
         hasProjectContext: hasProjectContext(),
         agentPolling: agentPollingConnected(),
+        activeSessions: activeSessionSummaries(),
       }) + '\n\n');
 
       state.sseClients.add(res);
-      clearTimeout(state.exitTimer);
 
       // Keepalive: SSE comment every 30s prevents silent connection drops.
       const heartbeat = setInterval(() => {
@@ -1827,6 +1882,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
             return;
           }
         }
+        if (msg.type === 'exit') {
+          cleanupSvelteComponentSessionsBeforeExit();
+        }
         if (msg.type !== 'checkpoint') {
           enqueueEvent(msg);
         }
@@ -1905,6 +1963,36 @@ function handlePollGet(req, res, url) {
   });
 }
 
+function sessionFileMetadataFromPollReply(file) {
+  if (!file || typeof file !== 'string') return { file };
+  const normalized = file.split(path.sep).join('/');
+  const base = { file: normalized };
+  if (!normalized.endsWith('/manifest.json') && normalized !== 'manifest.json') return base;
+  if (!normalized.includes('node_modules/.impeccable-live/') && !normalized.includes('src/lib/impeccable/')) return base;
+
+  let full;
+  try {
+    full = path.resolve(process.cwd(), normalized);
+    const rel = path.relative(process.cwd(), full);
+    if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) return base;
+  } catch {
+    return base;
+  }
+
+  try {
+    const manifest = JSON.parse(fs.readFileSync(full, 'utf-8'));
+    if (manifest?.previewMode !== 'svelte-component' || !manifest.sourceFile) return base;
+    return {
+      file: String(manifest.sourceFile).split(path.sep).join('/'),
+      sourceFile: String(manifest.sourceFile).split(path.sep).join('/'),
+      previewFile: normalized,
+      previewMode: 'svelte-component',
+    };
+  } catch {
+    return base;
+  }
+}
+
 function handlePollPost(req, res) {
   let body = '';
   req.on('data', (c) => { body += c; });
@@ -1965,6 +2053,16 @@ function handlePollPost(req, res) {
       res.end(JSON.stringify({ error: 'stale_manual_edit_apply_reply', ...rollback }));
       return;
     }
+    const pendingEventBeforeAck = findPendingEventById(msg.id);
+    if (pendingEventBeforeAck?.type === 'steer' && msg.type === 'steer_done'
+        && !msg.file && !(typeof msg.message === 'string' && msg.message.trim())) {
+      res.writeHead(400, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({
+        error: 'steer_done_requires_file_or_message',
+        hint: 'Reply with --file after writing source, or include a message explaining an intentional no-op.',
+      }));
+      return;
+    }
     const acknowledgedEvent = acknowledgePendingEvent(msg.id);
     let skipJournalReply = false;
     let existingSession = null;
@@ -1987,6 +2085,7 @@ function handlePollPost(req, res) {
       }));
       return;
     }
+    const replyFileMeta = sessionFileMetadataFromPollReply(msg.file);
     if (state.sessionStore && msg.id && !skipJournalReply) {
       try {
         const eventType = msg.type === 'steer_done'
@@ -2001,7 +2100,10 @@ function handlePollPost(req, res) {
         state.sessionStore.appendEvent({
           type: eventType,
           id: msg.id,
-          file: msg.file,
+          file: replyFileMeta.file,
+          sourceFile: replyFileMeta.sourceFile,
+          previewFile: replyFileMeta.previewFile,
+          previewMode: replyFileMeta.previewMode,
           message: msg.message,
           sourceEventType: acknowledgedEvent?.type,
           carbonize: msg.data?.carbonize === true,
@@ -2010,7 +2112,16 @@ function handlePollPost(req, res) {
     }
     flushPendingPolls();
     // Forward the reply to the browser via SSE
-    broadcast({ type: msg.type || 'done', id: msg.id, message: msg.message, file: msg.file, data: msg.data });
+    broadcast({
+      type: msg.type || 'done',
+      id: msg.id,
+      message: msg.message,
+      file: msg.file,
+      sourceFile: replyFileMeta.sourceFile,
+      previewFile: replyFileMeta.previewFile,
+      previewMode: replyFileMeta.previewMode,
+      data: msg.data,
+    });
     res.writeHead(200, { 'Content-Type': 'application/json' });
     res.end(JSON.stringify({ ok: true }));
   });
@@ -2023,6 +2134,7 @@ function handlePollPost(req, res) {
 let httpServer = null;
 
 function shutdown() {
+  cleanupSvelteComponentSessionsBeforeExit();
   removeLiveServerInfo(process.cwd());
   if (state.leaseTimer) clearTimeout(state.leaseTimer);
   state.leaseTimer = null;
@@ -2037,6 +2149,25 @@ function shutdown() {
   process.exit(0);
 }
 
+function cleanupSvelteComponentSessionsBeforeExit() {
+  try {
+    removeAllSvelteComponentSessions(process.cwd());
+  } catch (err) {
+    console.warn('[impeccable] Svelte component session cleanup failed:', err.message);
+  }
+}
+
+function applyLegacyDeferredAcceptsOnStartup() {
+  try {
+    const result = applyDeferredSvelteComponentAccepts(process.cwd());
+    if (result.applied > 0 || result.failed > 0) {
+      console.log('[impeccable] applied legacy deferred Svelte component accepts:', JSON.stringify(result));
+    }
+  } catch (err) {
+    console.warn('[impeccable] legacy deferred Svelte component accept apply failed:', err.message);
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Main
 // ---------------------------------------------------------------------------
@@ -2162,6 +2293,7 @@ rollbackManualApplyTransaction({
   cwd: process.cwd(),
   reason: 'manual_edit_server_start_recovered_abandoned_transaction',
 });
+applyLegacyDeferredAcceptsOnStartup();
 restorePendingEventsFromStore();
 pruneStaleManualApplyEvidence(process.cwd());
 const portArg = args.find(a => a.startsWith('--port='));

.cursor/skills/impeccable/scripts/live-session-store.mjs

@@ -106,6 +106,8 @@ function baseSnapshot(id) {
     phase: 'new',
     pageUrl: null,
     sourceFile: null,
+    previewFile: null,
+    previewMode: null,
     expectedVariants: 0,
     arrivedVariants: 0,
     visibleVariant: null,
@@ -177,8 +179,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
     case 'variants_ready':
     case 'agent_done':
       next.phase = event.carbonize === true ? 'carbonize_required' : 'variants_ready';
-      next.sourceFile = event.file ?? next.sourceFile;
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
-      next.arrivedVariants = event.arrivedVariants ?? (next.arrivedVariants ?? next.expectedVariants);
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.arrivedVariants = event.arrivedVariants ?? (next.expectedVariants || next.arrivedVariants || 0);
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       if (event.carbonize === true) {
@@ -190,12 +194,19 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       }
       break;
     case 'checkpoint':
+      if (COMPLETED_PHASES.has(next.phase)) {
+        next.diagnostics.push({ error: 'checkpoint_after_terminal_ignored', phase: event.phase ?? null, revision: event.revision ?? null });
+        break;
+      }
       if ((event.revision ?? 0) >= (next.checkpointRevision ?? 0)) {
         next.phase = event.phase ?? next.phase;
         next.checkpointRevision = event.revision ?? next.checkpointRevision;
         next.activeOwner = event.owner ?? next.activeOwner;
         next.arrivedVariants = event.arrivedVariants ?? next.arrivedVariants;
         next.visibleVariant = event.visibleVariant ?? next.visibleVariant;
+        next.sourceFile = event.sourceFile ?? next.sourceFile;
+        next.previewFile = event.previewFile ?? next.previewFile;
+        next.previewMode = event.previewMode ?? next.previewMode;
         if (event.paramValues) next.paramValues = { ...event.paramValues };
       } else {
         next.diagnostics.push({ error: 'stale_checkpoint_ignored', revision: event.revision });
@@ -223,6 +234,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'steer_done':
       next.phase = 'steer_done';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.message = event.message ?? next.message;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;
@@ -238,6 +253,9 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'complete':
       next.phase = 'completed';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;

.cursor/skills/impeccable/scripts/live-svelte-component.mjs

@@ -0,0 +1,826 @@
+/**
+ * Svelte live-mode component injection helpers.
+ *
+ * Variants are real .svelte components under node_modules/.impeccable-live/<session-id>/.
+ * The browser mounts them via Svelte 5 mount(); accept inlines the chosen
+ * variant back into the route source with props mapped to original bindings.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+import os from 'node:os';
+import { createHash } from 'node:crypto';
+
+export const SVELTE_COMPONENT_ROOT = 'node_modules/.impeccable-live';
+export const SVELTE_RUNTIME_FILE = `${SVELTE_COMPONENT_ROOT}/__runtime.js`;
+export const DEFERRED_ACCEPTS_FILE = '.impeccable/live/deferred-svelte-component-accepts.json';
+
+const MUSTACHE_RE = /\{([^{}]+)\}/g;
+
+export function shouldUseSvelteComponentInjection(filePath) {
+  if (/^(0|false|no)$/i.test(process.env.IMPECCABLE_LIVE_SVELTE_COMPONENT || '')) return false;
+  return path.extname(filePath).toLowerCase() === '.svelte';
+}
+
+export function componentSessionDir(id, cwd = process.cwd()) {
+  return path.join(cwd, SVELTE_COMPONENT_ROOT, id);
+}
+
+export function manifestPathForSession(id, cwd = process.cwd()) {
+  return path.join(componentSessionDir(id, cwd), 'manifest.json');
+}
+
+export function ensureRuntimeHelper(cwd = process.cwd()) {
+  const file = path.join(cwd, SVELTE_RUNTIME_FILE);
+  if (fs.existsSync(file)) return file;
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, `export { mount, unmount } from 'svelte';\n`, 'utf-8');
+  return file;
+}
+
+/**
+ * Extract ordered unique mustache expressions from markup (not inside <!-- -->).
+ */
+export function extractMustacheExpressions(text) {
+  const expressions = [];
+  const seen = new Set();
+  const lines = String(text || '').split('\n');
+  for (const line of lines) {
+    const trimmed = line.trim();
+    if (trimmed.startsWith('<!--')) continue;
+    let match;
+    MUSTACHE_RE.lastIndex = 0;
+    while ((match = MUSTACHE_RE.exec(line)) !== null) {
+      const expr = match[1].trim();
+      if (!expr || seen.has(expr)) continue;
+      seen.add(expr);
+      expressions.push(expr);
+    }
+  }
+  return expressions;
+}
+
+export function buildPropContract(expressions) {
+  return expressions.map((expr, index) => {
+    const derived = derivePropName(expr, index);
+    return {
+      prop: derived,
+      expr,
+      placeholder: `{${expr}}`,
+    };
+  });
+}
+
+function derivePropName(expr, index) {
+  const tail = expr.match(/(?:\.|\[)(\w+)\s*\]?$/);
+  if (tail && tail[1] && /^[A-Za-z_$][\w$]*$/.test(tail[1])) {
+    return tail[1];
+  }
+  return `prop${index}`;
+}
+
+export function substituteExprsWithProps(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(entry.placeholder).join(`{${entry.prop}}`);
+  }
+  return out;
+}
+
+export function substitutePropsWithExprs(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(`{${entry.prop}}`).join(`{${entry.expr}}`);
+  }
+  return out;
+}
+
+export function parseSvelteComponentFile(content) {
+  const text = String(content || '');
+  const scriptMatch = text.match(/^([\s\S]*?)<script\b[^>]*>[\s\S]*?<\/script>/i);
+  const withoutScript = scriptMatch ? text.slice(scriptMatch[0].length) : text;
+  const styleMatch = withoutScript.match(/<style\b[^>]*>[\s\S]*?<\/style\s*>/i);
+  const styleBlock = styleMatch ? styleMatch[0] : '';
+  const markup = styleMatch
+    ? withoutScript.slice(0, styleMatch.index).trim()
+    : withoutScript.trim();
+  const cssLines = styleBlock
+    ? styleBlock
+      .replace(/^<style\b[^>]*>/i, '')
+      .replace(/<\/style\s*>$/i, '')
+      .split('\n')
+      .map((line) => line.trimEnd())
+    : [];
+  while (cssLines.length > 0 && cssLines[0].trim() === '') cssLines.shift();
+  while (cssLines.length > 0 && cssLines[cssLines.length - 1].trim() === '') cssLines.pop();
+  return { markup, cssLines, styleBlock };
+}
+
+function buildPropsScript(contract) {
+  if (contract.length === 0) {
+    return '<script>\n  /** @type {Record<string, never>} */\n  let {} = $props();\n</script>\n';
+  }
+  const names = contract.map((c) => c.prop).join(', ');
+  const typeFields = contract.map((c) => `    ${c.prop}: string;`).join('\n');
+  return `<script>\n  /** @type {{\n${typeFields}\n  }} */\n  let { ${names} } = $props();\n</script>\n`;
+}
+
+function buildVariantStub(variantNum, originalWithProps, contract) {
+  const propsComment = contract.length > 0
+    ? `\n<!-- Props: ${contract.map((c) => `${c.prop} <- {${c.expr}}`).join(', ')} -->\n`
+    : '';
+  return `${buildPropsScript(contract)}${propsComment}${originalWithProps.trim()}\n\n<style>\n  /* Variant ${variantNum}: add scoped CSS here */\n</style>\n`;
+}
+
+function buildInsertVariantStub(variantNum) {
+  return `${buildPropsScript([])}<div class="impeccable-insert-preview">Insert variant ${variantNum}</div>\n\n<style>\n  .impeccable-insert-preview { display: block; }\n</style>\n`;
+}
+
+export function scaffoldSvelteComponentSession({
+  id,
+  count,
+  sourceFile,
+  sourceStartLine,
+  sourceEndLine,
+  originalLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const originalMarkup = originalLines.join('\n');
+  const contract = buildPropContract(extractMustacheExpressions(originalMarkup));
+  const originalWithProps = substituteExprsWithProps(originalMarkup, contract);
+
+  const manifest = {
+    id,
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    sourceStartLine,
+    sourceEndLine,
+    count,
+    propContract: contract,
+    originalMarkup,
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildVariantStub(n, originalWithProps, contract), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: contract,
+  };
+}
+
+export function scaffoldSvelteComponentInsertSession({
+  id,
+  count,
+  sourceFile,
+  insertLine,
+  position,
+  anchorStartLine,
+  anchorEndLine,
+  anchorLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const anchorMarkup = (anchorLines || []).join('\n');
+  const manifest = {
+    id,
+    mode: 'insert',
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    insertLine,
+    position,
+    anchorStartLine,
+    anchorEndLine,
+    originalMarkup: anchorMarkup,
+    anchorMarkup,
+    count,
+    propContract: [],
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildInsertVariantStub(n), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: [],
+  };
+}
+
+export function findSvelteComponentManifest(id, cwd = process.cwd()) {
+  const direct = manifestPathForSession(id, cwd);
+  if (fs.existsSync(direct)) {
+    return readManifest(direct);
+  }
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return null;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    const candidate = path.join(root, entry.name, 'manifest.json');
+    if (!fs.existsSync(candidate)) continue;
+    try {
+      const manifest = readManifest(candidate);
+      if (manifest?.id === id) return { ...manifest, manifestPath: candidate };
+    } catch { /* skip */ }
+  }
+  return null;
+}
+
+export function readManifest(manifestPath) {
+  const data = JSON.parse(fs.readFileSync(manifestPath, 'utf-8'));
+  return {
+    ...data,
+    manifestPath,
+  };
+}
+
+export function resolveSourceFile(sourceFile, cwd = process.cwd()) {
+  if (!sourceFile || path.isAbsolute(sourceFile)) {
+    throw new Error('Invalid svelte-component source file');
+  }
+  const full = path.resolve(cwd, sourceFile);
+  const rel = path.relative(cwd, full);
+  if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) {
+    throw new Error('Svelte-component source file escapes project root');
+  }
+  if (!fs.existsSync(full)) {
+    throw new Error('Svelte-component source file not found: ' + sourceFile);
+  }
+  return full;
+}
+
+function appendCssToSvelteStyle(lines, cssLines) {
+  const closeIdx = findLastStyleCloseLine(lines);
+  const prepared = ['', ...cssLines.map((line) => (line.trim() === '' ? '' : '  ' + line.trimStart()))];
+  if (closeIdx === -1) {
+    return [...lines, '', '<style>', ...prepared.slice(1), '</style>'];
+  }
+  return [
+    ...lines.slice(0, closeIdx),
+    ...prepared,
+    ...lines.slice(closeIdx),
+  ];
+}
+
+function findLastStyleCloseLine(lines) {
+  for (let i = lines.length - 1; i >= 0; i--) {
+    if (/<\/style\s*>/.test(lines[i])) return i;
+  }
+  return -1;
+}
+
+function bakeParamValuesInCss(cssLines, paramValues) {
+  if (!paramValues || Object.keys(paramValues).length === 0) return cssLines;
+  return cssLines.map((line) => {
+    let out = line;
+    for (const [key, value] of Object.entries(paramValues)) {
+      const varName = `--p-${key}`;
+      out = out.replace(new RegExp(`var\\(${escapeRegExp(varName)}(?:,\\s*[^)]+)?\\)`, 'g'), String(value));
+    }
+    return out;
+  });
+}
+
+function sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues = null, rootTag = 'div') {
+  const css = String((cssLines || []).join('\n'));
+  if (!/data-impeccable-variant|impeccable-variant-ready/.test(css)) return cssLines;
+
+  const rules = parseCssRules(css);
+  const output = [];
+  for (const rule of rules) {
+    appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag);
+  }
+  return output.join('\n')
+    .split('\n')
+    .map((line) => line.trimEnd())
+    .filter((line) => line.trim() !== '');
+}
+
+function appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag) {
+  const prelude = rule.prelude.trim();
+  const body = rule.body.trim();
+  if (!prelude || !body || /--impeccable-variant-ready\s*:/.test(body)) return;
+
+  if (/^@scope\b/i.test(prelude)) {
+    if (/data-impeccable-variant/.test(prelude) && !selectorHasVariant(prelude, variantNum)) return;
+    const inner = parseCssRules(body);
+    for (const innerRule of inner) {
+      const rewrittenPrelude = rewriteAcceptedSvelteSelector(innerRule.prelude, variantNum, paramValues, rootTag, true);
+      if (!rewrittenPrelude || /--impeccable-variant-ready\s*:/.test(innerRule.body)) continue;
+      output.push(formatCssRule(rewrittenPrelude, innerRule.body.trim()));
+    }
+    return;
+  }
+
+  const rewrittenPrelude = rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, false);
+  if (!rewrittenPrelude) return;
+  output.push(formatCssRule(rewrittenPrelude, body));
+}
+
+function parseCssRules(css) {
+  const rules = [];
+  const text = String(css || '');
+  let i = 0;
+  while (i < text.length) {
+    while (i < text.length && /\s/.test(text[i])) i++;
+    const preludeStart = i;
+    while (i < text.length && text[i] !== '{') i++;
+    if (i >= text.length) break;
+    const prelude = text.slice(preludeStart, i).trim();
+    i++;
+    const bodyStart = i;
+    let depth = 1;
+    let quote = null;
+    let comment = false;
+    while (i < text.length && depth > 0) {
+      const ch = text[i];
+      const next = text[i + 1];
+      if (comment) {
+        if (ch === '*' && next === '/') {
+          comment = false;
+          i += 2;
+          continue;
+        }
+        i++;
+        continue;
+      }
+      if (quote) {
+        if (ch === '\\') {
+          i += 2;
+          continue;
+        }
+        if (ch === quote) quote = null;
+        i++;
+        continue;
+      }
+      if (ch === '/' && next === '*') {
+        comment = true;
+        i += 2;
+        continue;
+      }
+      if (ch === '"' || ch === "'") {
+        quote = ch;
+        i++;
+        continue;
+      }
+      if (ch === '{') depth++;
+      else if (ch === '}') depth--;
+      i++;
+    }
+    const body = text.slice(bodyStart, Math.max(bodyStart, i - 1));
+    if (prelude) rules.push({ prelude, body });
+  }
+  return rules;
+}
+
+function rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, fromScope) {
+  const selectors = splitSelectorList(prelude);
+  const rewritten = [];
+  for (const selector of selectors) {
+    const next = rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope);
+    if (next) rewritten.push(next);
+  }
+  return rewritten.join(', ');
+}
+
+function rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope) {
+  let out = selector.trim();
+  const hasVariant = /data-impeccable-variant/.test(out);
+  if (hasVariant && !selectorHasVariant(out, variantNum)) return '';
+  if (hasVariant) {
+    out = out.replace(variantSelectorRegex(variantNum), '');
+    out = out.replace(/\[data-impeccable-variant=(["']).*?\1\]/g, '');
+  }
+
+  const paramResult = rewriteParamSelectors(out, paramValues);
+  if (!paramResult.keep) return '';
+  out = paramResult.selector;
+
+  out = out
+    .replace(/:scope(?:\[[^\]]+\])?\s*>\s*/g, '')
+    .replace(/:scope(?:\[[^\]]+\])?/g, rootTag || '')
+    .replace(/\s+/g, ' ')
+    .trim();
+
+  out = out.replace(/^[>+~]\s*/, '').trim();
+  if (!out && (hasVariant || fromScope)) return rootTag || ':global(*)';
+  return out;
+}
+
+function rewriteParamSelectors(selector, paramValues) {
+  let keep = true;
+  const next = selector.replace(/\[data-p-([A-Za-z0-9_-]+)(?:=(["'])(.*?)\2)?\]/g, (_match, key, _quote, expected) => {
+    if (!paramValues || !Object.prototype.hasOwnProperty.call(paramValues, key)) return '';
+    const actual = paramValues[key];
+    if (expected != null && String(actual) !== String(expected)) {
+      keep = false;
+      return '';
+    }
+    if (expected == null && (actual === false || actual == null || actual === 'false' || actual === 'off' || actual === '0')) {
+      keep = false;
+      return '';
+    }
+    return '';
+  });
+  return { keep, selector: next };
+}
+
+function splitSelectorList(prelude) {
+  const selectors = [];
+  let start = 0;
+  let bracket = 0;
+  let paren = 0;
+  let quote = null;
+  for (let i = 0; i < prelude.length; i++) {
+    const ch = prelude[i];
+    if (quote) {
+      if (ch === '\\') i++;
+      else if (ch === quote) quote = null;
+      continue;
+    }
+    if (ch === '"' || ch === "'") {
+      quote = ch;
+      continue;
+    }
+    if (ch === '[') bracket++;
+    else if (ch === ']') bracket = Math.max(0, bracket - 1);
+    else if (ch === '(') paren++;
+    else if (ch === ')') paren = Math.max(0, paren - 1);
+    else if (ch === ',' && bracket === 0 && paren === 0) {
+      selectors.push(prelude.slice(start, i));
+      start = i + 1;
+    }
+  }
+  selectors.push(prelude.slice(start));
+  return selectors;
+}
+
+function selectorHasVariant(selector, variantNum) {
+  return variantSelectorRegex(variantNum).test(selector);
+}
+
+function variantSelectorRegex(variantNum) {
+  return new RegExp(`\\[data-impeccable-variant=(["'])${escapeRegExp(String(variantNum))}\\1\\]`, 'g');
+}
+
+function formatCssRule(selector, body) {
+  return `${selector} { ${body.trim()} }`;
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+export function inlineSvelteComponentAccept(manifest, variantNum, paramValues = null, cwd = process.cwd()) {
+  const sourceFile = resolveSourceFile(manifest.sourceFile, cwd);
+  const variantPath = path.join(cwd, manifest.componentDir, `v${variantNum}.svelte`);
+  const resultBase = {
+    file: manifest.sourceFile,
+    sourceFile: manifest.sourceFile,
+    previewMode: 'svelte-component',
+    componentDir: manifest.componentDir,
+    carbonize: false,
+  };
+  if (!fs.existsSync(variantPath)) {
+    return { handled: false, error: `Variant ${variantNum} not found`, ...resultBase };
+  }
+
+  const { markup, cssLines } = parseSvelteComponentFile(fs.readFileSync(variantPath, 'utf-8'));
+  if (manifest.mode === 'insert') {
+    return inlineSvelteComponentInsertAccept({
+      manifest,
+      markup,
+      cssLines,
+      variantNum,
+      paramValues,
+      sourceFile,
+      resultBase,
+      cwd,
+    });
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const contract = manifest.propContract || [];
+  const mergedMarkup = mergeOriginalTopLevelAttrs(markup, manifest.originalMarkup || '');
+  const restoredMarkup = substitutePropsWithExprs(mergedMarkup, contract)
+    .split('\n')
+    .map((line) => line.trimEnd());
+
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const start = Number(manifest.sourceStartLine) - 1;
+  const end = Number(manifest.sourceEndLine) - 1;
+  if (!Number.isInteger(start) || !Number.isInteger(end) || start < 0 || end < start || end >= sourceLines.length) {
+    return { handled: false, error: 'Invalid source line range for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const indent = sourceLines[start].match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, start),
+    ...indentedMarkup,
+    ...sourceLines.slice(end + 1),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function inlineSvelteComponentInsertAccept({
+  manifest,
+  markup,
+  cssLines,
+  variantNum,
+  paramValues,
+  sourceFile,
+  resultBase,
+  cwd,
+}) {
+  if (!svelteMarkupHasVisibleContent(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant is empty', ...resultBase };
+  }
+  if (/\bdata-impeccable-[\w-]*\s*=/.test(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant contains preview-only data-impeccable attributes', ...resultBase };
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const restoredMarkup = String(markup || '')
+    .split('\n')
+    .map((line) => line.trimEnd());
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const insertIndex = Number(manifest.insertLine) - 1;
+  if (!Number.isInteger(insertIndex) || insertIndex < 0 || insertIndex > sourceLines.length) {
+    return { handled: false, error: 'Invalid insert line for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const nearbyLine = sourceLines[insertIndex] ?? sourceLines[insertIndex - 1] ?? '';
+  const indent = nearbyLine.match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, insertIndex),
+    ...indentedMarkup,
+    ...sourceLines.slice(insertIndex),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function svelteMarkupHasVisibleContent(markup) {
+  const text = String(markup || '')
+    .replace(/<script[\s\S]*?<\/script>/gi, '')
+    .replace(/<style[\s\S]*?<\/style>/gi, '')
+    .replace(/<!--[\s\S]*?-->/g, '')
+    .replace(/<[^>]+>/g, ' ')
+    .replace(/\s+/g, ' ')
+    .trim();
+  if (text.length > 0) return true;
+  return /<(img|svg|canvas|video|audio|picture|input|button|select|textarea)\b/i.test(markup || '');
+}
+
+function mergeOriginalTopLevelAttrs(markup, originalMarkup) {
+  const variantOpen = matchOpeningTag(markup);
+  const originalOpen = matchOpeningTag(originalMarkup);
+  if (!variantOpen || !originalOpen) return markup;
+  if (variantOpen.tag.toLowerCase() !== originalOpen.tag.toLowerCase()) return markup;
+
+  const variantAttrs = parseAttrSegments(variantOpen.attrs);
+  const originalAttrs = parseAttrSegments(originalOpen.attrs);
+  const additions = [];
+  let attrs = variantOpen.attrs;
+
+  const originalClass = originalAttrs.get('class');
+  const variantClass = variantAttrs.get('class');
+  if (originalClass && variantClass) {
+    const merged = mergeStaticClassAttr(originalClass, variantClass);
+    if (merged) {
+      attrs = attrs.slice(0, variantClass.start) + merged + attrs.slice(variantClass.end);
+      variantAttrs.set('class', { ...variantClass, raw: merged });
+    }
+  } else if (originalClass && !variantClass) {
+    additions.push(originalClass.raw);
+  }
+
+  for (const [name, attr] of originalAttrs) {
+    if (name === 'class') continue;
+    if (!variantAttrs.has(name)) additions.push(attr.raw);
+  }
+
+  if (additions.length === 0 && attrs === variantOpen.attrs) return markup;
+  const nextOpen = variantOpen.prefix
+    + variantOpen.tag
+    + attrs
+    + additions.map((attr) => ' ' + attr.trim()).join('')
+    + variantOpen.close;
+  return markup.slice(0, variantOpen.index) + nextOpen + markup.slice(variantOpen.index + variantOpen.raw.length);
+}
+
+function matchOpeningTag(markup) {
+  const match = String(markup || '').match(/^(\s*<)([A-Za-z][\w:-]*)([^>]*?)(\/?>)/);
+  if (!match) return null;
+  return {
+    raw: match[0],
+    prefix: match[1],
+    tag: match[2],
+    attrs: match[3] || '',
+    close: match[4],
+    index: match.index || 0,
+  };
+}
+
+function parseAttrSegments(attrs) {
+  const out = new Map();
+  const re = /([A-Za-z_:][\w:.-]*)(?:\s*=\s*(?:"[^"]*"|'[^']*'|\{[^}]*\}|[^\s"'>=]+))?/g;
+  let match;
+  while ((match = re.exec(attrs))) {
+    const raw = match[0];
+    const name = match[1];
+    out.set(name, {
+      name,
+      raw,
+      start: match.index,
+      end: match.index + raw.length,
+    });
+  }
+  return out;
+}
+
+function mergeStaticClassAttr(originalClass, variantClass) {
+  const originalValue = originalClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  const variantValue = variantClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  if (!originalValue || !variantValue) return null;
+  const quote = variantValue[1];
+  const classes = [
+    ...variantValue[2].split(/\s+/),
+    ...originalValue[2].split(/\s+/),
+  ].filter(Boolean);
+  return `class=${quote}${[...new Set(classes)].join(' ')}${quote}`;
+}
+
+export function removeSvelteComponentSession(id, cwd = process.cwd()) {
+  const dir = componentSessionDir(id, cwd);
+  try {
+    fs.rmSync(dir, { recursive: true, force: true });
+  } catch { /* non-fatal */ }
+}
+
+export function removeAllSvelteComponentSessions(cwd = process.cwd()) {
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    if (entry.name.startsWith('__')) continue;
+    try {
+      fs.rmSync(path.join(root, entry.name), { recursive: true, force: true });
+    } catch { /* non-fatal */ }
+  }
+}
+
+export function deferredAcceptsPath(cwd = process.cwd()) {
+  const key = createHash('sha1').update(path.resolve(cwd)).digest('hex').slice(0, 16);
+  return path.join(os.tmpdir(), 'impeccable-live', key, 'deferred-svelte-component-accepts.json');
+}
+
+export function readDeferredAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  try {
+    return JSON.parse(fs.readFileSync(file, 'utf-8'));
+  } catch {
+    return { accepts: [] };
+  }
+}
+
+export function writeDeferredAccept(entry, cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  const data = readDeferredAccepts(cwd);
+  data.accepts = (data.accepts || []).filter((item) => item.id !== entry.id);
+  data.accepts.push({ ...entry, createdAt: new Date().toISOString() });
+  fs.writeFileSync(file, JSON.stringify(data, null, 2) + '\n', 'utf-8');
+}
+
+export function applyDeferredSvelteComponentAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  const data = readDeferredAccepts(cwd);
+  const pending = Array.isArray(data.accepts) ? data.accepts : [];
+  const results = [];
+  const remaining = [];
+  for (const entry of pending) {
+    try {
+      const manifest = findSvelteComponentManifest(entry.id, cwd);
+      if (!manifest) {
+        results.push({ id: entry.id, ok: false, error: 'manifest not found' });
+        remaining.push(entry);
+        continue;
+      }
+      const result = inlineSvelteComponentAccept(
+        manifest,
+        entry.variantNum,
+        entry.paramValues || null,
+        cwd,
+      );
+      results.push({ id: entry.id, ok: result.handled !== false, result });
+      if (result.handled === false) remaining.push(entry);
+    } catch (err) {
+      results.push({ id: entry.id, ok: false, error: err.message });
+      remaining.push(entry);
+    }
+  }
+  if (remaining.length > 0) {
+    fs.writeFileSync(file, JSON.stringify({ accepts: remaining }, null, 2) + '\n', 'utf-8');
+  } else {
+    try { fs.rmSync(file, { force: true }); } catch {}
+  }
+  return { applied: results.filter((r) => r.ok).length, failed: results.filter((r) => !r.ok).length, results };
+}
+
+export function buildSvelteComponentCssAuthoring(count) {
+  const variantNumbers = Array.from({ length: count }, (_, i) => i + 1);
+  return {
+    mode: 'svelte-component',
+    styleTag: null,
+    strategy: 'component-style-block',
+    rulePattern: '.semantic-class { ... }',
+    selectorExamples: variantNumbers.map(() => '.expense-row { padding: 22px; }'),
+    requirements: [
+      'Write each variant as a real Svelte component file (v1.svelte, v2.svelte, ...).',
+      'Keep the prop names from propContract; bind dynamic text with {propName}, not literal snapshot text.',
+      'Put variant CSS in the component <style> block using semantic class selectors.',
+      'Author param-driven CSS against var(--p-<id>, default) and [data-p-<id>] using :global(...) so the runtime knob values reach the mounted root.',
+      'Declare params in componentDir/params.json keyed by variant number (e.g. {"1": [...], "2": [...]}), NOT as a data-impeccable-params attribute.',
+      'Do not use @scope or data-impeccable-variant selectors in component files.',
+      'Do not edit the route source file during generation; only edit files under componentDir.',
+    ],
+    forbidden: [
+      'Do not use @scope blocks in Svelte component variants.',
+      'Do not copy live DOM snapshot text into markup when propContract provides bindings.',
+      'Do not add data-impeccable-* attributes inside component files. Svelte parses { in attribute values as an expression, so data-impeccable-params with JSON breaks the build; use componentDir/params.json instead.',
+    ],
+    paramsFile: 'params.json',
+  };
+}

.cursor/skills/impeccable/scripts/live-sveltekit-adapter.mjs

@@ -0,0 +1,274 @@
+/**
+ * SvelteKit live-mode adapter.
+ *
+ * SvelteKit must not be patched through src/app.html. That file is a document
+ * template, not framework-owned component chrome. The adapter keeps SvelteKit
+ * work limited to mounting a dev-only shadow host from +layout.svelte; the
+ * actual live UI remains the shared plain-DOM browser chrome.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+
+export const SVELTE_LIVE_ROOT_COMPONENT = 'src/lib/impeccable/ImpeccableLiveRoot.svelte';
+export const SVELTE_LAYOUT_MARKER_OPEN = '<!-- impeccable-live-svelte-start -->';
+export const SVELTE_LAYOUT_MARKER_CLOSE = '<!-- impeccable-live-svelte-end -->';
+export const SVELTE_ROOT_IMPORT = "import ImpeccableLiveRoot from '$lib/impeccable/ImpeccableLiveRoot.svelte';";
+
+export function detectSvelteKitProject(cwd = process.cwd(), config = null) {
+  const appHtml = findSvelteKitAppHtml(cwd, config);
+  if (!appHtml) return null;
+  const hasTemplateMarkers = fileIncludes(path.join(cwd, appHtml), '%sveltekit.body%')
+    && fileIncludes(path.join(cwd, appHtml), '%sveltekit.head%');
+  if (!hasTemplateMarkers) return null;
+
+  const hasSvelteConfig = fs.existsSync(path.join(cwd, 'svelte.config.js'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.mjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.cjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.ts'));
+  const hasKitPackage = packageHasSvelteKit(cwd);
+  if (!hasSvelteConfig && !hasKitPackage) return null;
+
+  return {
+    appHtml,
+    layoutFile: findSvelteKitLayout(cwd),
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function applySvelteKitLiveAdapter({ cwd = process.cwd(), port, config = null } = {}) {
+  if (!Number.isFinite(Number(port))) {
+    throw new Error('SvelteKit live adapter requires a numeric port');
+  }
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  ensureSvelteLiveRootComponent(cwd, Number(port));
+
+  const layoutRel = detected.layoutFile;
+  const layoutAbs = path.join(cwd, layoutRel);
+  fs.mkdirSync(path.dirname(layoutAbs), { recursive: true });
+  const layoutExisted = fs.existsSync(layoutAbs);
+  const before = layoutExisted ? fs.readFileSync(layoutAbs, 'utf-8') : defaultSvelteLayout();
+  const after = patchSvelteLayout(before);
+  fs.writeFileSync(layoutAbs, after, 'utf-8');
+
+  return {
+    file: layoutRel,
+    adapter: 'sveltekit',
+    inserted: after !== before || !layoutExisted,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function removeSvelteKitLiveAdapter({ cwd = process.cwd(), config = null } = {}) {
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  const layoutAbs = path.join(cwd, detected.layoutFile);
+  let removed = false;
+  if (fs.existsSync(layoutAbs)) {
+    const before = fs.readFileSync(layoutAbs, 'utf-8');
+    const after = unpatchSvelteLayout(before);
+    if (after !== before) {
+      fs.writeFileSync(layoutAbs, after, 'utf-8');
+      removed = true;
+    }
+  }
+
+  const rootAbs = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  if (fs.existsSync(rootAbs)) {
+    fs.rmSync(rootAbs, { force: true });
+    removed = true;
+  }
+
+  pruneEmptyDir(path.dirname(rootAbs), path.join(cwd, 'src'));
+
+  return {
+    file: detected.layoutFile,
+    adapter: 'sveltekit',
+    removed,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function patchSvelteLayout(content) {
+  let out = String(content || '');
+  if (!out.includes(SVELTE_ROOT_IMPORT)) {
+    const scriptMatch = out.match(/<script(?:\s[^>]*)?>/i);
+    if (scriptMatch) {
+      const insertAt = scriptMatch.index + scriptMatch[0].length;
+      out = out.slice(0, insertAt) + '\n  ' + SVELTE_ROOT_IMPORT + out.slice(insertAt);
+    } else {
+      out = `<script>\n  ${SVELTE_ROOT_IMPORT}\n</script>\n\n` + out;
+    }
+  }
+
+  if (!out.includes(SVELTE_LAYOUT_MARKER_OPEN)) {
+    const block = `${SVELTE_LAYOUT_MARKER_OPEN}\n<ImpeccableLiveRoot />\n${SVELTE_LAYOUT_MARKER_CLOSE}\n`;
+    const renderMatch = out.match(/\{@render\s+children(?:\?\.)?\(\)\s*\}/);
+    const slotMatch = out.match(/<slot\s*\/?>/);
+    const match = renderMatch || slotMatch;
+    if (match) {
+      out = out.slice(0, match.index) + block + out.slice(match.index);
+    } else {
+      out = out.replace(/\s*$/, '\n\n' + block);
+    }
+  }
+
+  return out;
+}
+
+export function unpatchSvelteLayout(content) {
+  let out = String(content || '');
+  const blockRe = new RegExp(
+    '([ \\t]*)' + escapeRegExp(SVELTE_LAYOUT_MARKER_OPEN)
+    + '\\n<ImpeccableLiveRoot\\s*/>\\n'
+    + escapeRegExp(SVELTE_LAYOUT_MARKER_CLOSE)
+    + '\\n?',
+    'g',
+  );
+  out = out.replace(blockRe, '$1');
+  out = out.replace(new RegExp('^\\s*' + escapeRegExp(SVELTE_ROOT_IMPORT) + '\\s*\\n?', 'gm'), '');
+  out = out.replace(/<script>\s*<\/script>\s*\n?/g, '');
+  return out.replace(/\n{3,}/g, '\n\n');
+}
+
+export function ensureSvelteLiveRootComponent(cwd, port) {
+  const file = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, buildSvelteLiveRootComponent(port), 'utf-8');
+  return file;
+}
+
+export function buildSvelteLiveRootComponent(port) {
+  return `<script>
+  import { onMount } from 'svelte';
+
+  const LIVE_URL = 'http://localhost:${Number(port)}/live.js';
+  const HOST_ID = 'impeccable-live-root';
+
+  onMount(() => {
+    let host = document.querySelector('impeccable-live-root#' + HOST_ID) || document.getElementById(HOST_ID);
+    if (!host) {
+      host = document.createElement('impeccable-live-root');
+      host.id = HOST_ID;
+      document.body.appendChild(host);
+    }
+
+    host.dataset.impeccableLiveAdapter = 'sveltekit';
+    host.style.setProperty('all', 'initial', 'important');
+    host.style.setProperty('display', 'block', 'important');
+    host.style.setProperty('position', 'fixed', 'important');
+    host.style.setProperty('top', '0', 'important');
+    host.style.setProperty('left', '0', 'important');
+    host.style.setProperty('width', '0', 'important');
+    host.style.setProperty('height', '0', 'important');
+    host.style.setProperty('overflow', 'visible', 'important');
+    host.style.setProperty('z-index', '2147483000', 'important');
+    host.style.setProperty('pointer-events', 'none', 'important');
+
+    const root = host.shadowRoot || host.attachShadow({ mode: 'open' });
+    if (!root.querySelector('style[data-impeccable-live-reset]')) {
+      const reset = document.createElement('style');
+      reset.dataset.impeccableLiveReset = 'true';
+      reset.textContent = ':host, :host *, * { box-sizing: border-box; }';
+      root.appendChild(reset);
+    }
+
+    window.__IMPECCABLE_LIVE_ADAPTER__ = 'sveltekit';
+    window.__IMPECCABLE_LIVE_UI_ROOT__ = root;
+    window.__IMPECCABLE_LIVE_CHROME_MOUNT__ = {
+      adapter: 'sveltekit',
+      version: 1,
+      host,
+      root,
+    };
+
+    const script = document.createElement('script');
+    script.src = LIVE_URL;
+    script.async = true;
+    script.dataset.impeccableLiveScript = 'true';
+    document.head.appendChild(script);
+
+    return () => {
+      script.remove();
+      if (window.__IMPECCABLE_LIVE_UI_ROOT__ === root) delete window.__IMPECCABLE_LIVE_UI_ROOT__;
+      if (window.__IMPECCABLE_LIVE_CHROME_MOUNT__?.root === root) delete window.__IMPECCABLE_LIVE_CHROME_MOUNT__;
+      if (window.__IMPECCABLE_LIVE_ADAPTER__ === 'sveltekit') delete window.__IMPECCABLE_LIVE_ADAPTER__;
+    };
+  });
+</script>
+`;
+}
+
+function findSvelteKitAppHtml(cwd, config) {
+  const files = Array.isArray(config?.files) ? config.files : ['src/app.html'];
+  for (const rel of files) {
+    if (rel.includes('*')) continue;
+    const normalized = rel.split(path.sep).join('/');
+    if (!normalized.endsWith('app.html')) continue;
+    const abs = path.join(cwd, normalized);
+    if (fs.existsSync(abs)) return normalized;
+  }
+  const fallback = 'src/app.html';
+  return fs.existsSync(path.join(cwd, fallback)) ? fallback : null;
+}
+
+function findSvelteKitLayout(cwd) {
+  const candidates = [
+    'src/routes/+layout.svelte',
+    'src/routes/(app)/+layout.svelte',
+  ];
+  for (const rel of candidates) {
+    if (fs.existsSync(path.join(cwd, rel))) return rel;
+  }
+  return 'src/routes/+layout.svelte';
+}
+
+function defaultSvelteLayout() {
+  return `<script>\n  let { children } = $props();\n</script>\n\n{@render children?.()}\n`;
+}
+
+function packageHasSvelteKit(cwd) {
+  const file = path.join(cwd, 'package.json');
+  if (!fs.existsSync(file)) return false;
+  try {
+    const pkg = JSON.parse(fs.readFileSync(file, 'utf-8'));
+    const deps = {
+      ...(pkg.dependencies || {}),
+      ...(pkg.devDependencies || {}),
+      ...(pkg.peerDependencies || {}),
+    };
+    return Boolean(deps['@sveltejs/kit'] || deps['@sveltejs/vite-plugin-svelte'] || deps.svelte);
+  } catch {
+    return false;
+  }
+}
+
+function fileIncludes(file, text) {
+  try {
+    return fs.readFileSync(file, 'utf-8').includes(text);
+  } catch {
+    return false;
+  }
+}
+
+function pruneEmptyDir(dir, stopDir) {
+  let current = dir;
+  while (current.startsWith(stopDir) && current !== stopDir) {
+    try {
+      if (fs.readdirSync(current).length > 0) return;
+      fs.rmdirSync(current);
+      current = path.dirname(current);
+    } catch {
+      return;
+    }
+  }
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}

.cursor/skills/impeccable/scripts/live-ui-core.mjs

@@ -0,0 +1,179 @@
+/**
+ * Framework-neutral Impeccable live chrome contract.
+ *
+ * The production browser bundle is intentionally plain DOM so Svelte, React,
+ * Vue, and static adapters can all mount the same chrome. This module is the
+ * testable contract/inventory for that bundle; live-browser.js mirrors these
+ * values at runtime because it is served as a standalone script.
+ */
+
+export const LIVE_CHROME_MOUNT_CONTRACT = Object.freeze([
+  'root',
+  'transport',
+  'state',
+  'actions',
+]);
+
+export const LIVE_UI_SURFACES = Object.freeze([
+  {
+    key: 'global-bottom-bar',
+    ids: [
+      'impeccable-live-global-bar',
+      'impeccable-live-global-bar-brand',
+      'impeccable-live-pick-toggle',
+      'impeccable-live-insert-toggle',
+      'impeccable-live-detect-toggle',
+      'impeccable-live-detect-badge',
+      'impeccable-live-design-toggle',
+      'impeccable-live-page-chat',
+      'impeccable-live-page-chat-input',
+      'impeccable-live-page-chat-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'active', 'tooltip'],
+  },
+  {
+    key: 'pending-copy-edit-dock',
+    ids: ['impeccable-live-pending-dock'],
+    states: ['closed', 'open', 'hover', 'pressed', 'loading', 'rollback', 'keep-fixing'],
+  },
+  {
+    key: 'element-selection-chrome',
+    ids: [
+      'impeccable-live-highlight',
+      'impeccable-live-tooltip',
+      'impeccable-live-bar',
+      'impeccable-live-configure-input-wrap',
+      'impeccable-live-input',
+      'impeccable-live-configure-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'disabled'],
+  },
+  {
+    key: 'action-picker',
+    ids: ['impeccable-live-picker'],
+    states: ['closed', 'open', 'option-hover', 'option-focus'],
+  },
+  {
+    key: 'edit-chrome',
+    ids: ['impeccable-live-edit-badge'],
+    states: ['enabled', 'disabled', 'editing', 'cancel', 'save', 'edited-content'],
+  },
+  {
+    key: 'generating-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-shader'],
+    states: ['action-label', 'animated-dots', 'generating', 'done'],
+  },
+  {
+    key: 'variant-cycling-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-params-panel'],
+    states: ['variant-1', 'variant-2', 'variant-3', 'left-disabled', 'right-disabled', 'dot-click', 'accept', 'discard'],
+  },
+  {
+    key: 'variant-params-panel',
+    ids: ['impeccable-live-params-panel'],
+    states: ['closed', 'open-above', 'open-below', 'range', 'steps', 'toggle'],
+  },
+  {
+    key: 'saving-confirmed-rows',
+    ids: ['impeccable-live-bar'],
+    states: ['saving', 'applying-variant', 'confirmed'],
+  },
+  {
+    key: 'insert-mode-chrome',
+    ids: [
+      'impeccable-live-insert-line',
+      'impeccable-live-insert-placeholder',
+      'impeccable-live-placeholder-resize',
+      'impeccable-live-insert-input',
+      'impeccable-live-insert-voice',
+      'impeccable-live-insert-create',
+      'impeccable-live-insert-create-tooltip',
+    ],
+    states: ['toggle-active', 'line', 'placeholder', 'resize', 'enabled', 'disabled', 'tooltip'],
+  },
+  {
+    key: 'annotation-chrome',
+    ids: [
+      'impeccable-live-annot',
+      'impeccable-live-annot-svg',
+      'impeccable-live-annot-pins',
+      'impeccable-live-annot-clear',
+    ],
+    states: ['overlay', 'drawing', 'pin', 'pin-edit', 'clear'],
+  },
+  {
+    key: 'design-system-panel',
+    ids: ['impeccable-live-design-host'],
+    states: ['closed', 'open', 'tabs', 'token-tiles', 'copy'],
+  },
+  {
+    key: 'toasts-and-errors',
+    ids: ['impeccable-live-toast'],
+    states: ['normal', 'error', 'no-variants-mounted'],
+  },
+  {
+    key: 'css-isolation-boundary',
+    ids: ['impeccable-live-root'],
+    states: ['shadow-root', 'style-tags', 'hostile-css'],
+  },
+]);
+
+export const LIVE_UI_COMPONENT_IDS = Object.freeze([
+  ...new Set(LIVE_UI_SURFACES.flatMap((surface) => surface.ids)),
+]);
+
+export function resolveLiveUiRoot(env = globalThis) {
+  const doc = env?.document;
+  const explicit = env?.__IMPECCABLE_LIVE_UI_ROOT__
+    || env?.window?.__IMPECCABLE_LIVE_UI_ROOT__;
+  if (explicit && typeof explicit.appendChild === 'function') return explicit;
+  return doc?.body || null;
+}
+
+export function getLiveUiElementById(id, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (!id) return null;
+  if (root?.getElementById) {
+    const found = root.getElementById(id);
+    if (found) return found;
+  }
+  if (root?.querySelector) {
+    const found = root.querySelector('#' + escapeCssIdent(id));
+    if (found) return found;
+  }
+  return doc?.getElementById?.(id) || null;
+}
+
+export function appendToLiveUiRoot(el, env = globalThis) {
+  const root = resolveLiveUiRoot(env);
+  if (!root) throw new Error('Impeccable live UI root is not available');
+  root.appendChild(el);
+  return el;
+}
+
+export function appendStyleToLiveUiRoot(styleEl, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (root && root !== doc?.body) {
+    root.appendChild(styleEl);
+  } else {
+    (doc?.head || doc?.body || root).appendChild(styleEl);
+  }
+  return styleEl;
+}
+
+export function activeElementDeep(doc = globalThis.document) {
+  let active = doc?.activeElement || null;
+  while (active?.shadowRoot?.activeElement) {
+    active = active.shadowRoot.activeElement;
+  }
+  return active;
+}
+
+function escapeCssIdent(value) {
+  if (typeof CSS !== 'undefined' && typeof CSS.escape === 'function') {
+    return CSS.escape(String(value));
+  }
+  return String(value).replace(/([ !"#$%&'()*+,./:;<=>?@[\\\]^`{|}~])/g, '\\$1');
+}

.cursor/skills/impeccable/scripts/live-wrap.mjs

@@ -15,6 +15,11 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -262,6 +267,8 @@ The agent should insert variant HTML at insertLine.`);
     .map((l) => (l.trim() === '' ? '' : indent + extra + l.slice(originalBaseIndent)))
     .join('\n');
   const originalIndented = reindentOriginal('    ');
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+  const useSvelteComponent = shouldUseSvelteComponentInjection(targetFile);
 
   // Wrapper attributes differ by syntax. HTML allows plain string attrs;
   // JSX requires object-literal style and parses string attrs as HTML (which
@@ -302,38 +309,75 @@ The agent should insert variant HTML at insertLine.`);
     indent + commentSyntax.open + ' impeccable-variants-end ' + id + ' ' + commentSyntax.close,
   ];
 
-  // Replace the original element with the wrapper
+  let outputFile = targetFile;
-  const newLines = [
+  let outputLines;
-    ...lines.slice(0, startLine),
+  let outputStartLine = startLine + 1;
-    ...wrapperLines,
+  let outputEndLine = startLine + wrapperLines.length + (originalLines.length - 1);
-    ...lines.slice(endLine + 1),
+  let insertLine;
-  ];
+  let svelteSession = null;
-  fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
 
-  // Calculate insert line (the "insert below this line" comment).
+  if (useSvelteComponent) {
-  // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // Svelte/SvelteKit resets component-local state on markup HMR updates.
-  // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // Keep generation source-neutral: agents write real variant components
-  // original-div + content + close-original-div; JSX: outer-div +
+    // under the generated componentDir, the browser mounts them into the live
-  // start-comment + Original-comment + original-div + content +
+    // DOM, and live-accept.mjs inlines the accepted variant back into the route.
-  // close-original-div). Multi-line originals push the marker by their
+    svelteSession = scaffoldSvelteComponentSession({
-  // extra line count.
+      id,
-  const insertLine = startLine + 6 + (originalLines.length - 1);
+      count,
+      sourceFile: relTargetFile,
+      sourceStartLine: startLine + 1,
+      sourceEndLine: endLine + 1,
+      originalLines,
+      cwd: process.cwd(),
+    });
+    outputFile = path.resolve(process.cwd(), svelteSession.manifestFile);
+    outputStartLine = 1;
+    outputEndLine = 1;
+    insertLine = 1;
+  } else {
+    // Replace the original element with the wrapper
+    const newLines = [
+      ...lines.slice(0, startLine),
+      ...wrapperLines,
+      ...lines.slice(endLine + 1),
+    ];
+    fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
+
+    // Calculate insert line (the "insert below this line" comment).
+    // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // original-div + content + close-original-div; JSX: outer-div +
+    // start-comment + Original-comment + original-div + content +
+    // close-original-div). Multi-line originals push the marker by their
+    // extra line count.
+    insertLine = startLine + 6 + (originalLines.length - 1) + 1;
+  }
+
+  const outputRelFile = path.relative(process.cwd(), outputFile).split(path.sep).join('/');
+
+  const svelteComponentAuthoring = useSvelteComponent ? buildSvelteComponentCssAuthoring(count) : null;
 
   console.log(JSON.stringify({
-    file: path.relative(process.cwd(), targetFile),
+    file: outputRelFile,
-    startLine: startLine + 1,       // 1-indexed for the agent
+    sourceFile: useSvelteComponent ? relTargetFile : undefined,
+    previewMode: useSvelteComponent ? 'svelte-component' : undefined,
+    componentDir: svelteSession?.componentDir,
+    propContract: svelteSession?.propContract,
+    sourceStartLine: useSvelteComponent ? startLine + 1 : undefined,
+    sourceEndLine: useSvelteComponent ? endLine + 1 : undefined,
+    startLine: outputStartLine,       // 1-indexed for the agent
     // wrapperLines is an array but one element (the original-content slot)
     // is a `\n`-joined multi-line string, so the actual file-row count is
     // wrapperLines.length + (originalLines.length - 1). Without the offset,
     // endLine pointed inside the wrapper for any picked element that
     // spanned more than one source line.
-    endLine: startLine + wrapperLines.length + (originalLines.length - 1), // 1-indexed
+    endLine: outputEndLine, // 1-indexed
-    insertLine: insertLine + 1,     // 1-indexed: where variants go
+    insertLine,            // 1-indexed: where variants go
     commentSyntax: commentSyntax,
-    styleMode: styleMode.mode,
+    styleMode: useSvelteComponent ? 'svelte-component' : styleMode.mode,
-    styleTag: styleMode.styleTag,
+    styleTag: useSvelteComponent ? null : styleMode.styleTag,
-    cssSelectorPrefixExamples: buildCssSelectorPrefixExamples(styleMode.mode, count),
+    cssSelectorPrefixExamples: useSvelteComponent ? [] : buildCssSelectorPrefixExamples(styleMode.mode, count),
-    cssAuthoring: buildCssAuthoring(styleMode, count),
+    cssAuthoring: useSvelteComponent ? svelteComponentAuthoring : buildCssAuthoring(styleMode, count),
     originalLineCount: originalLines.length,
   }));
 }
@@ -527,6 +571,14 @@ function splitClassList(classes) {
   return String(classes).split(/[,\s]+/).map(c => c.trim()).filter(Boolean);
 }
 
+function attrEscapeDouble(str) {
+  return String(str)
+    .replace(/&/g, '&')
+    .replace(/"/g, '"')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;');
+}
+
 function detectCommentSyntax(filePath) {
   const ext = path.extname(filePath).toLowerCase();
   if (ext === '.jsx' || ext === '.tsx') {

.gemini/skills/impeccable/reference/live.md

@@ -111,7 +111,9 @@ node .gemini/skills/impeccable/scripts/live-insert.mjs --id EVENT_ID --count EVE
 
 The scaffold has **no** `data-impeccable-variant="original"`. Variants are net-new HTML+CSS inserted at `insertLine`. Load `brand.md` or `product.md` (freeform only, no action sub-command). Write all variants in one edit, then `--reply done`.
 
-On accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
+For Svelte/SvelteKit targets, `live-insert.mjs` returns `previewMode: "svelte-component"` with `mode: "insert"`, `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each inserted variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`. Insert variants must be non-empty net-new content with a single top-level root, no `data-impeccable-*` attributes, and CSS in each component's `<style>` block. Do **not** edit the route source during generation; the browser mounts the temporary component before/after the live anchor while the user cycles variants. On Accept, `live-accept.mjs` inserts the selected component markup into `sourceFile` immediately and deletes the temp session after the source write succeeds.
+
+For non-Svelte targets, on accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
 
 ### Replace mode (default)
 
@@ -149,6 +151,25 @@ If `--text` matches multiple candidates equally well, wrap exits with `{ error:
 
 Output on success: `{ file, insertLine, commentSyntax, styleMode, styleTag, cssSelectorPrefixExamples, cssAuthoring }`.
 
+For Svelte/SvelteKit targets, `live-wrap.mjs` returns `previewMode: "svelte-component"` with `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`; use the `propContract` prop names for dynamic text (`{propName}`), not literal snapshot strings. Put variant CSS in each component's `<style>` block with semantic class selectors (no `@scope`, no `data-impeccable-*`). Reply with `--file` set to the manifest path; the browser dynamically imports and mounts the compiled components so Svelte HMR does not reset page state while the user cycles variants. On Accept, `live-accept.mjs` inlines the accepted component back into `sourceFile` immediately after source promotion succeeds.
+
+**Params on the Svelte component path go in a sidecar, never as an attribute.** Svelte parses `{` inside an attribute value as the start of an expression, so a `data-impeccable-params='[{…}]'` attribute on a component element fails to compile (`Expected token }`). Declare params for this path in `componentDir/params.json`, keyed by variant number, using the exact param schema from section 7:
+
+```json
+{
+  "1": [
+    {"id":"density","kind":"steps","default":"snug","label":"Density","options":[
+      {"value":"airy","label":"Airy"},{"value":"snug","label":"Snug"},{"value":"packed","label":"Packed"}
+    ]}
+  ],
+  "2": [
+    {"id":"accent","kind":"range","min":0,"max":1,"step":0.05,"default":0.5,"label":"Accent"}
+  ]
+}
+```
+
+Author the component `<style>` against `var(--p-<id>, default)` for `range`/`toggle` and `[data-p-<id>="…"]` for `steps`; wrap those selectors in `:global(...)` so the knob values the runtime sets on the mounted root reach your rules. The browser reads `params.json`, docks the panel, and drives `--p-*` / `data-p-*` on the mounted component exactly as it does for the HTML/JSX path.
+
 `styleMode` controls how preview CSS must be authored. Treat it as a detected capability mode, not a framework guess:
 
 - `scoped`: use `@scope ([data-impeccable-variant="N"])` rules.
@@ -340,7 +361,7 @@ Each variant can expose **coarse** knobs alongside the full HTML/CSS replacement
 
 **Hard cap per variant**: at most **four** parameters so the panel stays legible; rare fifth only if the reference explicitly allows it.
 
-**How to declare.** Put a JSON manifest on the variant wrapper:
+**How to declare.** Put a JSON manifest on the variant wrapper (HTML/JSX path). **On the Svelte `svelte-component` path, do not use this attribute** (Svelte can't compile `{` inside an attribute value). Declare params in `componentDir/params.json` keyed by variant number instead (see the Svelte component paragraph in the wrap section). The param schema below is identical for both paths.
 
 ```html
 <div data-impeccable-variant="1" data-impeccable-params='[
@@ -454,7 +475,7 @@ Do these five steps in the current thread, synchronously, before the next poll.
 1. **Locate the carbonize block** in the source file (`_acceptResult.file`). It's bracketed by `<!-- impeccable-carbonize-start SESSION_ID -->` and `<!-- impeccable-carbonize-end SESSION_ID -->` and contains a `<style data-impeccable-css="SESSION_ID">` element. If the variant declared parameters, an `<!-- impeccable-param-values SESSION_ID: {...} -->` comment sits alongside the style tag with the user's chosen values; read it first; it drives steps 3 and 4 below.
 2. **Move the CSS rules** into the project's real stylesheet. Which stylesheet depends on the project (e.g. `site/styles/workflow.css` for an Astro project, or the component's co-located CSS file for a Vite/Next project; pick whichever already owns styling for the surrounding element).
 3. **Bake in parameter values while rewriting selectors.** For `@scope ([data-impeccable-variant="N"])` wrappers: retarget to real, semantic classes on the accepted HTML (`.why-visual--v2 .v2-label { … }`). For `:scope[data-p-<id>="VALUE"]` selectors: keep only the branch matching the chosen value from the param-values comment; drop the others (they're dead after accept). For `var(--p-<id>, DEFAULT)` in the CSS: either substitute the literal value, or if the param is still useful as a knob going forward, leave the var and update its initial declaration to the chosen value.
-4. **Unwrap the accepted content.** Delete the `<div data-impeccable-variant="N" style="display: contents">` that wraps it. Drop `data-impeccable-params` and any `data-p-*` attributes from it; those are live-mode plumbing, not source.
+4. **Unwrap the accepted content.** Delete the inner `<div data-impeccable-variant="N" style="display: contents">` that wraps it. On JSX/TSX, also delete the outer `<div data-impeccable-carbonize="SESSION_ID" style={{ display: 'contents' }}>` wrapper if present (accept adds it so ternary/`return` slots keep a single root). Drop `data-impeccable-params` and any `data-p-*` attributes; those are live-mode plumbing, not source.
 5. **Delete the inline `<style>` block, the `<!-- impeccable-param-values -->` comment if present, and both `<!-- impeccable-carbonize-start/end -->` markers.** Also drop any `@scope` rules for variants other than the accepted one; those are dead code now.
 
 After the file is clean, run `live-complete.mjs --id SESSION_ID`, verify it reports `phase: "completed"`, then poll again.

.gemini/skills/impeccable/scripts/live-accept.mjs

@@ -17,6 +17,12 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer, writeBuffer as writeManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  findSvelteComponentManifest,
+  inlineSvelteComponentAccept,
+  removeSvelteComponentSession,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -41,6 +47,9 @@ Required:
 
 Options:
   --page-url URL     Current browser page URL; scopes staged copy-edit cleanup
+  --defer-source-write
+                     Deprecated compatibility flag. Svelte component accepts
+                     now write the real source immediately.
 
 Output (JSON):
   { handled, file, carbonize }`);
@@ -64,18 +73,67 @@ Output (JSON):
 
   // Find the file containing this session's markers
   const found = findSessionFile(id, process.cwd());
-  if (!found) {
+  const svelteComponentManifest = found ? null : findSvelteComponentManifest(id, process.cwd());
+
+  if (!found && !svelteComponentManifest) {
     console.log(JSON.stringify({ handled: false, error: 'Session markers not found for id: ' + id }));
     process.exit(0);
   }
 
+  if (svelteComponentManifest) {
+    if (isDiscard) {
+      removeSvelteComponentSession(id, process.cwd());
+      console.log(JSON.stringify({
+        handled: true,
+        file: svelteComponentManifest.sourceFile,
+        carbonize: false,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      }));
+      return;
+    }
+
+    let result;
+    try {
+      result = inlineSvelteComponentAccept(
+        svelteComponentManifest,
+        variantNum,
+        paramValues,
+        process.cwd(),
+      );
+    } catch (err) {
+      result = {
+        handled: false,
+        error: err.message,
+        file: svelteComponentManifest.sourceFile,
+        sourceFile: svelteComponentManifest.sourceFile,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      };
+    }
+    if (result.carbonize) {
+      result.todo = 'REQUIRED before next poll: carbonize cleanup in ' + result.file + '. See reference/live.md "Required after accept".';
+    }
+    console.log(JSON.stringify({ handled: result.handled !== false, ...result }));
+    return;
+  }
+
   const { file: targetFile, content, lines } = found;
   const relFile = path.relative(process.cwd(), targetFile);
+  const previewBlock = findMarkerBlock(id, lines);
+  const sourceShadowPreview = previewBlock
+    ? readSourceShadowPreviewMeta(content, id)
+    : null;
+
+  if (sourceShadowPreview) {
+    console.log(JSON.stringify({
+      handled: false,
+      error: 'source_shadow_preview_deprecated',
+      hint: 'Svelte live mode now uses svelte-component injection. Re-wrap the element and regenerate variants.',
+    }));
+    process.exit(0);
+  }
 
-  // Bail if the session lives in a generated file. The agent manually wrote
-  // the wrapper there for preview, and is responsible for writing the
-  // accepted variant to true source (or cleaning up on discard). See
-  // "Handle fallback" in live.md.
   if (isGeneratedFile(targetFile, { cwd: process.cwd() })) {
     console.log(JSON.stringify({
       handled: false,
@@ -207,6 +265,71 @@ function handleDiscard(id, lines, targetFile) {
 // Accept
 // ---------------------------------------------------------------------------
 
+/**
+ * Build carbonize stitch-in lines. JSX targets occupy a single child slot
+ * (ternary branch, return value, etc.) — the same constraint as live-wrap.
+ * When isJsx, tuck markers + <style> + variant wrapper inside one outer
+ * <div data-impeccable-carbonize> so the slot keeps a single root node.
+ */
+function buildCarbonizeReplacement({
+  indent,
+  commentSyntax,
+  isJsx,
+  id,
+  variantNum,
+  cssContent,
+  paramValues,
+  restored,
+}) {
+  const lines = [];
+  if (!cssContent) {
+    lines.push(...restored);
+    return lines;
+  }
+
+  const variantStyleAttr = isJsx
+    ? "style={{ display: 'contents' }}"
+    : 'style="display: contents"';
+
+  const pushCarbonizeBody = (bodyIndent) => {
+    const bodyRestored = reindentContent(restored, indent, bodyIndent + '  ');
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    for (const cssLine of cssContent) {
+      lines.push(bodyIndent + cssLine.trimStart());
+    }
+    lines.push(bodyIndent + (isJsx ? '`}</style>' : '</style>'));
+    if (paramValues && Object.keys(paramValues).length > 0) {
+      lines.push(
+        bodyIndent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close,
+      );
+    }
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<div data-impeccable-variant="' + variantNum + '" ' + variantStyleAttr + '>');
+    lines.push(...bodyRestored);
+    lines.push(bodyIndent + '</div>');
+  };
+
+  if (isJsx) {
+    const wrapperStyle = 'style={{ display: "contents" }}';
+    lines.push(indent + '<div data-impeccable-carbonize="' + id + '" ' + wrapperStyle + '>');
+    pushCarbonizeBody(indent + '  ');
+    lines.push(indent + '</div>');
+  } else {
+    pushCarbonizeBody(indent);
+  }
+
+  return lines;
+}
+
+function reindentContent(contentLines, fromIndent, toIndent) {
+  return contentLines.map((line) => {
+    if (line.trim() === '') return '';
+    if (line.startsWith(fromIndent)) return toIndent + line.slice(fromIndent.length);
+    return toIndent + line.trimStart();
+  });
+}
+
 function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const block = findMarkerBlock(id, lines);
   if (!block) return { handled: false, error: 'Markers not found' };
@@ -235,45 +358,17 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const hasHelperAttrs = variantText.includes('data-impeccable-variant');
   const needsCarbonize = !!(cssContent || hasHelperAttrs);
 
-  // Build the replacement
   const restored = deindentContent(variantContent, indent);
-  const replacement = [];
+  const replacement = buildCarbonizeReplacement({
-
+    indent,
-  if (cssContent) {
+    commentSyntax,
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    isJsx,
-    // JSX targets need the CSS body wrapped in a template literal so that the
+    id,
-    // `{` and `}` in CSS rules don't get parsed as JSX expressions.
+    variantNum,
-    replacement.push(indent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    cssContent,
-    // Re-indent CSS content to match
+    paramValues,
-    for (const cssLine of cssContent) {
+    restored,
-      replacement.push(indent + cssLine.trimStart());
+  });
-    }
-    replacement.push(indent + (isJsx ? '`}</style>' : '</style>'));
-    if (paramValues && Object.keys(paramValues).length > 0) {
-      // Preserve the user's knob positions for the carbonize-cleanup agent
-      // to bake into the final CSS when it collapses scoped rules.
-      replacement.push(indent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close);
-    }
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
-  }
-
-  // Keep the `@scope ([data-impeccable-variant="N"])` selectors in the
-  // carbonize CSS block working visually by re-wrapping the accepted content
-  // in a data-impeccable-variant="N" div with `display: contents` (so layout
-  // isn't affected). The carbonize agent strips this attribute + wrapper when
-  // it moves the CSS to a proper stylesheet.
-  //
-  // Style attribute syntax has to follow the host file's flavor — JSX files
-  // need the object form, otherwise React 19 throws "Failed to set indexed
-  // property [0] on CSSStyleDeclaration" while parsing the string char-by-char.
-  if (cssContent) {
-    const styleAttr = isJsx ? "style={{ display: 'contents' }}" : 'style="display: contents"';
-    replacement.push(indent + '<div data-impeccable-variant="' + variantNum + '" ' + styleAttr + '>');
-    replacement.push(...restored);
-    replacement.push(indent + '</div>');
-  } else {
-    replacement.push(...restored);
-  }
 
   const newLines = [
     ...lines.slice(0, replaceRange.start),
@@ -285,6 +380,34 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   return { carbonize: needsCarbonize, acceptedOriginalText: originalContent.join('\n') };
 }
 
+function readSourceShadowPreviewMeta(content, id) {
+  const escaped = escapeRegExp(id);
+  const wrapperRe = new RegExp('<[^>]+data-impeccable-variants=(["\'])' + escaped + '\\1[^>]*>');
+  const match = String(content || '').match(wrapperRe);
+  if (!match) return null;
+  const tag = match[0];
+  if (readHtmlAttr(tag, 'data-impeccable-preview') !== 'source-shadow') return null;
+  const sourceFile = readHtmlAttr(tag, 'data-impeccable-source-file');
+  const sourceStartLine = Number(readHtmlAttr(tag, 'data-impeccable-source-start'));
+  const sourceEndLine = Number(readHtmlAttr(tag, 'data-impeccable-source-end'));
+  if (!sourceFile || !Number.isFinite(sourceStartLine) || !Number.isFinite(sourceEndLine)) return null;
+  return { sourceFile, sourceStartLine, sourceEndLine };
+}
+
+function readHtmlAttr(tag, name) {
+  const match = String(tag || '').match(new RegExp('\\s' + escapeRegExp(name) + '\\s*=\\s*(["\'])(.*?)\\1'));
+  if (!match) return null;
+  return decodeHtmlAttr(match[2]);
+}
+
+function decodeHtmlAttr(value) {
+  return String(value || '')
+    .replace(/&quot;/g, '"')
+    .replace(/&lt;/g, '<')
+    .replace(/&gt;/g, '>')
+    .replace(/&amp;/g, '&');
+}
+
 // ---------------------------------------------------------------------------
 // Parsing helpers
 // ---------------------------------------------------------------------------
@@ -686,4 +809,4 @@ if (_running?.endsWith('live-accept.mjs') || _running?.endsWith('live-accept.mjs
   acceptCli();
 }
 
-export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock };
+export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock, applyDeferredSvelteComponentAccepts };

.gemini/skills/impeccable/scripts/live-completion.mjs

@@ -3,6 +3,7 @@ export function completionTypeForAcceptResult(eventType, acceptResult) {
   if (acceptResult?.handled === true && acceptResult?.carbonize === true) return 'agent_done';
   if (acceptResult?.handled === true) return 'complete';
   if (acceptResult?.mode === 'error') return 'error';
+  if (eventType === 'accept' && acceptResult?.previewMode === 'svelte-component') return 'error';
   return 'agent_done';
 }
 

.gemini/skills/impeccable/scripts/live-inject.mjs

@@ -17,11 +17,38 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { resolveLiveConfigPath } from './impeccable-paths.mjs';
+import {
+  applySvelteKitLiveAdapter,
+  detectSvelteKitProject,
+  removeSvelteKitLiveAdapter,
+} from './live-sveltekit-adapter.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const CONFIG_PATH = resolveLiveConfigPath({ cwd: process.cwd(), scriptsDir: __dirname });
 const MARKER_OPEN_TEXT = 'impeccable-live-start';
 const MARKER_CLOSE_TEXT = 'impeccable-live-end';
+const IGNORE_MARKER_OPEN = '# impeccable-live-ignore-start';
+const IGNORE_MARKER_CLOSE = '# impeccable-live-ignore-end';
+
+export const LIVE_IGNORE_PATTERNS = Object.freeze([
+  '.impeccable/hook.cache.json',
+  '.impeccable/live/server.json',
+  '.impeccable/live/sessions/',
+  '.impeccable/live/previews/',
+  '.impeccable/live/annotations/',
+  '.impeccable/live/cache/',
+  '.impeccable/live/manual-edit-apply-transaction.json',
+  '.impeccable/live/manual-edit-events.jsonl',
+  '.impeccable/live/manual-edit-evidence/',
+  '.impeccable/live/pending-manual-edits.json',
+  '.impeccable/live/deferred-svelte-component-accepts.json',
+  '.impeccable-live.json',
+  '.impeccable-live/',
+  'node_modules/.impeccable-live/',
+  'src/lib/impeccable/ImpeccableLiveRoot.svelte',
+  'src/lib/impeccable/__runtime.js',
+  'src/lib/impeccable/[0-9a-f]*/',
+]);
 
 /**
  * Hard-excluded directory patterns. These are NEVER user-facing pages and
@@ -83,8 +110,14 @@ Output (JSON):
   validateConfig(config);
 
   const resolvedFiles = resolveFiles(process.cwd(), config);
+  const svelteKit = detectSvelteKitProject(process.cwd(), config);
 
   if (args.includes('--remove')) {
+    if (svelteKit) {
+      const adapterResult = removeSvelteKitLiveAdapter({ cwd: process.cwd(), config });
+      console.log(JSON.stringify({ ok: true, adapter: 'sveltekit', results: [adapterResult] }));
+      return;
+    }
     const results = resolvedFiles.map((relFile) => {
       const absFile = path.resolve(process.cwd(), relFile);
       if (!fs.existsSync(absFile)) return { file: relFile, error: 'file_not_found' };
@@ -110,6 +143,13 @@ Output (JSON):
     console.error(JSON.stringify({ ok: false, error: 'missing_port' }));
     process.exit(1);
   }
+  const gitIgnore = ensureLiveGitIgnores(process.cwd());
+
+  if (svelteKit) {
+    const adapterResult = applySvelteKitLiveAdapter({ cwd: process.cwd(), port, config });
+    console.log(JSON.stringify({ ok: true, port, adapter: 'sveltekit', gitIgnore, results: [adapterResult] }));
+    return;
+  }
 
   const results = resolvedFiles.map((relFile) => {
     const absFile = path.resolve(process.cwd(), relFile);
@@ -129,10 +169,68 @@ Output (JSON):
     };
   });
   const anyInserted = results.some((r) => r.inserted);
-  console.log(JSON.stringify({ ok: anyInserted, port, results }));
+  console.log(JSON.stringify({ ok: anyInserted, port, gitIgnore, results }));
   if (!anyInserted) process.exit(1);
 }
 
+export function ensureLiveGitIgnores(cwd = process.cwd()) {
+  const target = resolveIgnoreTarget(cwd);
+  const existing = fs.existsSync(target.path) ? fs.readFileSync(target.path, 'utf-8') : '';
+  const block = [
+    IGNORE_MARKER_OPEN,
+    ...LIVE_IGNORE_PATTERNS,
+    IGNORE_MARKER_CLOSE,
+  ].join('\n');
+  const markerRe = new RegExp(`${escapeRegExp(IGNORE_MARKER_OPEN)}[\\s\\S]*?${escapeRegExp(IGNORE_MARKER_CLOSE)}`);
+
+  let updated;
+  if (markerRe.test(existing)) {
+    updated = existing.replace(markerRe, block);
+  } else {
+    const prefix = existing.length === 0 ? '' : existing.endsWith('\n') ? existing : existing + '\n';
+    updated = `${prefix}${prefix.endsWith('\n\n') || prefix === '' ? '' : '\n'}${block}\n`;
+  }
+
+  if (updated !== existing) {
+    fs.mkdirSync(path.dirname(target.path), { recursive: true });
+    fs.writeFileSync(target.path, updated, 'utf-8');
+  }
+
+  return {
+    file: path.relative(cwd, target.path).split(path.sep).join('/'),
+    mode: target.mode,
+    changed: updated !== existing,
+    patterns: [...LIVE_IGNORE_PATTERNS],
+  };
+}
+
+function resolveIgnoreTarget(cwd) {
+  const gitExcludePath = resolveGitInfoExcludePath(cwd);
+  if (gitExcludePath) {
+    return { path: gitExcludePath, mode: 'git-info-exclude' };
+  }
+  return { path: path.join(cwd, '.gitignore'), mode: 'gitignore' };
+}
+
+function resolveGitInfoExcludePath(cwd) {
+  const dotGit = path.join(cwd, '.git');
+  if (!fs.existsSync(dotGit)) return null;
+
+  const stat = fs.statSync(dotGit);
+  if (stat.isDirectory()) return path.join(dotGit, 'info', 'exclude');
+  if (!stat.isFile()) return null;
+
+  const body = fs.readFileSync(dotGit, 'utf-8').trim();
+  const match = body.match(/^gitdir:\s*(.+)$/i);
+  if (!match) return null;
+  const gitDir = path.isAbsolute(match[1]) ? match[1] : path.resolve(cwd, match[1]);
+  return path.join(gitDir, 'info', 'exclude');
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
 /**
  * Expand config.files (which may contain glob patterns) into a literal list
  * of existing file paths relative to rootDir. Literal entries pass through;

.gemini/skills/impeccable/scripts/live-insert.mjs

@@ -21,6 +21,11 @@ import {
   buildCssAuthoring,
   buildCssSelectorPrefixExamples,
 } from './live-wrap.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentInsertSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const INSERT_POSITIONS = new Set(['before', 'after']);
 
@@ -192,6 +197,41 @@ Output (JSON):
   const styleMode = detectStyleMode(targetFile);
   const isJsx = commentSyntax.open === '{/*';
   const spliceIndex = computeInsertLine(startLine, endLine, position);
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+
+  if (shouldUseSvelteComponentInjection(targetFile)) {
+    const session = scaffoldSvelteComponentInsertSession({
+      id,
+      count,
+      sourceFile: relTargetFile,
+      insertLine: spliceIndex + 1,
+      position,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      anchorLines: lines.slice(startLine, endLine + 1),
+      cwd: process.cwd(),
+    });
+    console.log(JSON.stringify({
+      mode: 'insert',
+      position,
+      file: session.manifestFile,
+      sourceFile: relTargetFile,
+      previewMode: 'svelte-component',
+      componentDir: session.componentDir,
+      propContract: session.propContract,
+      insertLine: 1,
+      sourceInsertLine: spliceIndex + 1,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      commentSyntax,
+      styleMode: 'svelte-component',
+      styleTag: null,
+      cssSelectorPrefixExamples: [],
+      cssAuthoring: buildSvelteComponentCssAuthoring(count),
+    }));
+    return;
+  }
+
   const indent = lines[spliceIndex]?.match(/^(\s*)/)?.[1]
     ?? lines[startLine]?.match(/^(\s*)/)?.[1]
     ?? '';
@@ -216,7 +256,7 @@ Output (JSON):
   console.log(JSON.stringify({
     mode: 'insert',
     position,
-    file: path.relative(process.cwd(), targetFile),
+    file: relTargetFile,
     insertLine: insertLine + 1,
     commentSyntax,
     styleMode: styleMode.mode,

.gemini/skills/impeccable/scripts/live-poll.mjs

@@ -20,6 +20,7 @@ import { readLiveServerInfo } from './impeccable-paths.mjs';
 // that ceiling and loop in `pollOnce` to synthesize a long poll without
 // depending on the standalone undici package.
 export const PER_REQUEST_TIMEOUT_MS = 270_000;
+export const DEFAULT_EVENT_LEASE_MS = 600_000;
 
 const EVENT_TYPES_NEEDING_AGENT_REPLY = new Set(['generate', 'steer', 'manual_edit_apply']);
 
@@ -156,7 +157,7 @@ export async function fetchNextEvent(base, token, { totalDeadline } = {}) {
       ? totalDeadline - Date.now()
       : PER_REQUEST_TIMEOUT_MS;
     const slice = Math.min(Math.max(remaining, 1000), PER_REQUEST_TIMEOUT_MS);
-    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}`);
+    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}&leaseMs=${DEFAULT_EVENT_LEASE_MS}`);
 
     if (res.status === 401) {
       const err = new Error('Authentication failed. The server token may have changed.');
@@ -317,7 +318,7 @@ Modes:
 Options:
   --timeout=MS        One-shot poll timeout in ms (default: 600000). Ignored in --stream mode
   --ack-timeout=MS    Stream mode: max wait for --reply after generate/steer (default: 600000)
-  --file PATH         Attach a source file path to the reply (generate flow)
+  --file PATH         Attach a source file path to the reply (generate/steer flow)
   --data JSON         Attach a JSON result object to the reply (manual_edit_apply flow). Must be valid JSON
   --help              Show this help message
 

.gemini/skills/impeccable/scripts/live-server.mjs

@@ -42,6 +42,10 @@ import {
 } from './live-manual-edits-buffer.mjs';
 import { buildManualEditEvidence } from './live-manual-edit-evidence.mjs';
 import { commitManualEdits } from './live-commit-manual-edits.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  removeAllSvelteComponentSessions,
+} from './live-svelte-component.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 // PRODUCT.md / DESIGN.md live wherever context.mjs resolves. The generated
@@ -103,6 +107,7 @@ const MIN_MANUAL_EDIT_APPLY_CHUNK_SIZE = 1;
 const MAX_MANUAL_EDIT_APPLY_CHUNK_SIZE = 20;
 const MANUAL_APPLY_COMPACT_TEXT_LIMIT = 240;
 const MANUAL_APPLY_COMPACT_NEARBY_LIMIT = 4;
+const POLL_LEASE_EXPIRY_TIMER_GRACE_MS = 2;
 const DEBUG_MANUAL_EDIT_EVENTS = /^(1|true|yes)$/i.test(process.env.IMPECCABLE_LIVE_DEBUG_EVENTS || '');
 
 function tombstoneTimedOutApplyId(eventId, details = {}) {
@@ -897,6 +902,8 @@ function leaseEvent(entry, leaseMs) {
     return entry.event;
   }
   entry.leaseUntil = Date.now() + leaseMs;
+  scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return entry.event;
 }
 
@@ -907,9 +914,16 @@ function acknowledgePendingEvent(id) {
   const acknowledged = state.pendingEvents[idx].event;
   state.pendingEvents.splice(idx, 1);
   scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return acknowledged;
 }
 
+function findPendingEventById(id) {
+  if (!id) return null;
+  const entry = state.pendingEvents.find((item) => item.event?.id === id);
+  return entry?.event || null;
+}
+
 function manualApplyReplyCommand(eventOrId = 'EVENT_ID') {
   const id = typeof eventOrId === 'string' ? eventOrId : eventOrId?.id || 'EVENT_ID';
   return `live-poll.mjs --reply ${id} done --data '<json>'`;
@@ -955,6 +969,42 @@ function summarizePendingEventForStatus(entry) {
   return summary;
 }
 
+function summarizeActiveSessionForClient(snapshot = {}) {
+  return {
+    id: snapshot.id,
+    phase: snapshot.phase,
+    pageUrl: snapshot.pageUrl ?? null,
+    sourceFile: snapshot.sourceFile ?? null,
+    previewFile: snapshot.previewFile ?? null,
+    previewMode: snapshot.previewMode ?? null,
+    expectedVariants: snapshot.expectedVariants ?? 0,
+    arrivedVariants: snapshot.arrivedVariants ?? 0,
+    visibleVariant: snapshot.visibleVariant ?? null,
+    checkpointRevision: snapshot.checkpointRevision ?? 0,
+    paramValues: snapshot.paramValues || {},
+  };
+}
+
+function activeSessionSummaries() {
+  if (!state.sessionStore) return [];
+  return state.sessionStore.listActiveSessions().map((snapshot) => summarizeActiveSessionForClient(snapshot));
+}
+
+function cancelQueuedAnonymousExitEvents() {
+  let removed = 0;
+  for (let i = state.pendingEvents.length - 1; i >= 0; i -= 1) {
+    const event = state.pendingEvents[i]?.event;
+    if (event?.type !== 'exit' || event.id) continue;
+    state.pendingEvents.splice(i, 1);
+    removed += 1;
+  }
+  if (removed > 0) {
+    scheduleLeaseFlush();
+    broadcastAgentPollingIfChanged();
+  }
+  return removed;
+}
+
 function cancelPendingManualApplyEvents(pageUrl, reason = 'manual_edit_discarded') {
   const canceledById = new Map();
   const shouldCancel = (event) => event?.type === 'manual_edit_apply' && (!pageUrl || event.pageUrl === pageUrl);
@@ -1001,7 +1051,6 @@ function scheduleLeaseFlush() {
     clearTimeout(state.leaseTimer);
     state.leaseTimer = null;
   }
-  if (state.pendingPolls.length === 0) return;
   const now = Date.now();
   const nextLeaseUntil = state.pendingEvents
     .map((entry) => entry.leaseUntil || 0)
@@ -1011,7 +1060,8 @@ function scheduleLeaseFlush() {
   state.leaseTimer = setTimeout(() => {
     state.leaseTimer = null;
     flushPendingPolls();
-  }, Math.max(0, nextLeaseUntil - now));
+    broadcastAgentPollingIfChanged();
+  }, Math.max(0, nextLeaseUntil - now + POLL_LEASE_EXPIRY_TIMER_GRACE_MS));
 }
 
 function flushPendingPolls() {
@@ -1032,7 +1082,9 @@ function flushPendingPolls() {
 }
 
 function agentPollingConnected() {
-  return state.pendingPolls.length > 0;
+  const now = Date.now();
+  return state.pendingPolls.length > 0
+    || state.pendingEvents.some((entry) => entry.leaseUntil && entry.leaseUntil > now);
 }
 
 function broadcastAgentPollingIfChanged() {
@@ -1318,7 +1370,7 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/status') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401, { 'Content-Type': 'application/json' }); res.end(JSON.stringify({ error: 'Unauthorized' })); return; }
-      const sessions = state.sessionStore ? state.sessionStore.listActiveSessions() : [];
+      const sessions = activeSessionSummaries();
       res.writeHead(200, { 'Content-Type': 'application/json' });
       res.end(JSON.stringify({
         status: 'ok',
@@ -1423,6 +1475,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/events' && req.method === 'GET') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401); res.end('Unauthorized'); return; }
+      clearTimeout(state.exitTimer);
+      state.exitTimer = null;
+      cancelQueuedAnonymousExitEvents();
       res.writeHead(200, {
         'Content-Type': 'text/event-stream',
         'Cache-Control': 'no-cache',
@@ -1432,10 +1487,10 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
         type: 'connected',
         hasProjectContext: hasProjectContext(),
         agentPolling: agentPollingConnected(),
+        activeSessions: activeSessionSummaries(),
       }) + '\n\n');
 
       state.sseClients.add(res);
-      clearTimeout(state.exitTimer);
 
       // Keepalive: SSE comment every 30s prevents silent connection drops.
       const heartbeat = setInterval(() => {
@@ -1827,6 +1882,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
             return;
           }
         }
+        if (msg.type === 'exit') {
+          cleanupSvelteComponentSessionsBeforeExit();
+        }
         if (msg.type !== 'checkpoint') {
           enqueueEvent(msg);
         }
@@ -1905,6 +1963,36 @@ function handlePollGet(req, res, url) {
   });
 }
 
+function sessionFileMetadataFromPollReply(file) {
+  if (!file || typeof file !== 'string') return { file };
+  const normalized = file.split(path.sep).join('/');
+  const base = { file: normalized };
+  if (!normalized.endsWith('/manifest.json') && normalized !== 'manifest.json') return base;
+  if (!normalized.includes('node_modules/.impeccable-live/') && !normalized.includes('src/lib/impeccable/')) return base;
+
+  let full;
+  try {
+    full = path.resolve(process.cwd(), normalized);
+    const rel = path.relative(process.cwd(), full);
+    if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) return base;
+  } catch {
+    return base;
+  }
+
+  try {
+    const manifest = JSON.parse(fs.readFileSync(full, 'utf-8'));
+    if (manifest?.previewMode !== 'svelte-component' || !manifest.sourceFile) return base;
+    return {
+      file: String(manifest.sourceFile).split(path.sep).join('/'),
+      sourceFile: String(manifest.sourceFile).split(path.sep).join('/'),
+      previewFile: normalized,
+      previewMode: 'svelte-component',
+    };
+  } catch {
+    return base;
+  }
+}
+
 function handlePollPost(req, res) {
   let body = '';
   req.on('data', (c) => { body += c; });
@@ -1965,6 +2053,16 @@ function handlePollPost(req, res) {
       res.end(JSON.stringify({ error: 'stale_manual_edit_apply_reply', ...rollback }));
       return;
     }
+    const pendingEventBeforeAck = findPendingEventById(msg.id);
+    if (pendingEventBeforeAck?.type === 'steer' && msg.type === 'steer_done'
+        && !msg.file && !(typeof msg.message === 'string' && msg.message.trim())) {
+      res.writeHead(400, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({
+        error: 'steer_done_requires_file_or_message',
+        hint: 'Reply with --file after writing source, or include a message explaining an intentional no-op.',
+      }));
+      return;
+    }
     const acknowledgedEvent = acknowledgePendingEvent(msg.id);
     let skipJournalReply = false;
     let existingSession = null;
@@ -1987,6 +2085,7 @@ function handlePollPost(req, res) {
       }));
       return;
     }
+    const replyFileMeta = sessionFileMetadataFromPollReply(msg.file);
     if (state.sessionStore && msg.id && !skipJournalReply) {
       try {
         const eventType = msg.type === 'steer_done'
@@ -2001,7 +2100,10 @@ function handlePollPost(req, res) {
         state.sessionStore.appendEvent({
           type: eventType,
           id: msg.id,
-          file: msg.file,
+          file: replyFileMeta.file,
+          sourceFile: replyFileMeta.sourceFile,
+          previewFile: replyFileMeta.previewFile,
+          previewMode: replyFileMeta.previewMode,
           message: msg.message,
           sourceEventType: acknowledgedEvent?.type,
           carbonize: msg.data?.carbonize === true,
@@ -2010,7 +2112,16 @@ function handlePollPost(req, res) {
     }
     flushPendingPolls();
     // Forward the reply to the browser via SSE
-    broadcast({ type: msg.type || 'done', id: msg.id, message: msg.message, file: msg.file, data: msg.data });
+    broadcast({
+      type: msg.type || 'done',
+      id: msg.id,
+      message: msg.message,
+      file: msg.file,
+      sourceFile: replyFileMeta.sourceFile,
+      previewFile: replyFileMeta.previewFile,
+      previewMode: replyFileMeta.previewMode,
+      data: msg.data,
+    });
     res.writeHead(200, { 'Content-Type': 'application/json' });
     res.end(JSON.stringify({ ok: true }));
   });
@@ -2023,6 +2134,7 @@ function handlePollPost(req, res) {
 let httpServer = null;
 
 function shutdown() {
+  cleanupSvelteComponentSessionsBeforeExit();
   removeLiveServerInfo(process.cwd());
   if (state.leaseTimer) clearTimeout(state.leaseTimer);
   state.leaseTimer = null;
@@ -2037,6 +2149,25 @@ function shutdown() {
   process.exit(0);
 }
 
+function cleanupSvelteComponentSessionsBeforeExit() {
+  try {
+    removeAllSvelteComponentSessions(process.cwd());
+  } catch (err) {
+    console.warn('[impeccable] Svelte component session cleanup failed:', err.message);
+  }
+}
+
+function applyLegacyDeferredAcceptsOnStartup() {
+  try {
+    const result = applyDeferredSvelteComponentAccepts(process.cwd());
+    if (result.applied > 0 || result.failed > 0) {
+      console.log('[impeccable] applied legacy deferred Svelte component accepts:', JSON.stringify(result));
+    }
+  } catch (err) {
+    console.warn('[impeccable] legacy deferred Svelte component accept apply failed:', err.message);
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Main
 // ---------------------------------------------------------------------------
@@ -2162,6 +2293,7 @@ rollbackManualApplyTransaction({
   cwd: process.cwd(),
   reason: 'manual_edit_server_start_recovered_abandoned_transaction',
 });
+applyLegacyDeferredAcceptsOnStartup();
 restorePendingEventsFromStore();
 pruneStaleManualApplyEvidence(process.cwd());
 const portArg = args.find(a => a.startsWith('--port='));

.gemini/skills/impeccable/scripts/live-session-store.mjs

@@ -106,6 +106,8 @@ function baseSnapshot(id) {
     phase: 'new',
     pageUrl: null,
     sourceFile: null,
+    previewFile: null,
+    previewMode: null,
     expectedVariants: 0,
     arrivedVariants: 0,
     visibleVariant: null,
@@ -177,8 +179,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
     case 'variants_ready':
     case 'agent_done':
       next.phase = event.carbonize === true ? 'carbonize_required' : 'variants_ready';
-      next.sourceFile = event.file ?? next.sourceFile;
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
-      next.arrivedVariants = event.arrivedVariants ?? (next.arrivedVariants ?? next.expectedVariants);
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.arrivedVariants = event.arrivedVariants ?? (next.expectedVariants || next.arrivedVariants || 0);
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       if (event.carbonize === true) {
@@ -190,12 +194,19 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       }
       break;
     case 'checkpoint':
+      if (COMPLETED_PHASES.has(next.phase)) {
+        next.diagnostics.push({ error: 'checkpoint_after_terminal_ignored', phase: event.phase ?? null, revision: event.revision ?? null });
+        break;
+      }
       if ((event.revision ?? 0) >= (next.checkpointRevision ?? 0)) {
         next.phase = event.phase ?? next.phase;
         next.checkpointRevision = event.revision ?? next.checkpointRevision;
         next.activeOwner = event.owner ?? next.activeOwner;
         next.arrivedVariants = event.arrivedVariants ?? next.arrivedVariants;
         next.visibleVariant = event.visibleVariant ?? next.visibleVariant;
+        next.sourceFile = event.sourceFile ?? next.sourceFile;
+        next.previewFile = event.previewFile ?? next.previewFile;
+        next.previewMode = event.previewMode ?? next.previewMode;
         if (event.paramValues) next.paramValues = { ...event.paramValues };
       } else {
         next.diagnostics.push({ error: 'stale_checkpoint_ignored', revision: event.revision });
@@ -223,6 +234,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'steer_done':
       next.phase = 'steer_done';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.message = event.message ?? next.message;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;
@@ -238,6 +253,9 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'complete':
       next.phase = 'completed';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;

.gemini/skills/impeccable/scripts/live-svelte-component.mjs

@@ -0,0 +1,826 @@
+/**
+ * Svelte live-mode component injection helpers.
+ *
+ * Variants are real .svelte components under node_modules/.impeccable-live/<session-id>/.
+ * The browser mounts them via Svelte 5 mount(); accept inlines the chosen
+ * variant back into the route source with props mapped to original bindings.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+import os from 'node:os';
+import { createHash } from 'node:crypto';
+
+export const SVELTE_COMPONENT_ROOT = 'node_modules/.impeccable-live';
+export const SVELTE_RUNTIME_FILE = `${SVELTE_COMPONENT_ROOT}/__runtime.js`;
+export const DEFERRED_ACCEPTS_FILE = '.impeccable/live/deferred-svelte-component-accepts.json';
+
+const MUSTACHE_RE = /\{([^{}]+)\}/g;
+
+export function shouldUseSvelteComponentInjection(filePath) {
+  if (/^(0|false|no)$/i.test(process.env.IMPECCABLE_LIVE_SVELTE_COMPONENT || '')) return false;
+  return path.extname(filePath).toLowerCase() === '.svelte';
+}
+
+export function componentSessionDir(id, cwd = process.cwd()) {
+  return path.join(cwd, SVELTE_COMPONENT_ROOT, id);
+}
+
+export function manifestPathForSession(id, cwd = process.cwd()) {
+  return path.join(componentSessionDir(id, cwd), 'manifest.json');
+}
+
+export function ensureRuntimeHelper(cwd = process.cwd()) {
+  const file = path.join(cwd, SVELTE_RUNTIME_FILE);
+  if (fs.existsSync(file)) return file;
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, `export { mount, unmount } from 'svelte';\n`, 'utf-8');
+  return file;
+}
+
+/**
+ * Extract ordered unique mustache expressions from markup (not inside <!-- -->).
+ */
+export function extractMustacheExpressions(text) {
+  const expressions = [];
+  const seen = new Set();
+  const lines = String(text || '').split('\n');
+  for (const line of lines) {
+    const trimmed = line.trim();
+    if (trimmed.startsWith('<!--')) continue;
+    let match;
+    MUSTACHE_RE.lastIndex = 0;
+    while ((match = MUSTACHE_RE.exec(line)) !== null) {
+      const expr = match[1].trim();
+      if (!expr || seen.has(expr)) continue;
+      seen.add(expr);
+      expressions.push(expr);
+    }
+  }
+  return expressions;
+}
+
+export function buildPropContract(expressions) {
+  return expressions.map((expr, index) => {
+    const derived = derivePropName(expr, index);
+    return {
+      prop: derived,
+      expr,
+      placeholder: `{${expr}}`,
+    };
+  });
+}
+
+function derivePropName(expr, index) {
+  const tail = expr.match(/(?:\.|\[)(\w+)\s*\]?$/);
+  if (tail && tail[1] && /^[A-Za-z_$][\w$]*$/.test(tail[1])) {
+    return tail[1];
+  }
+  return `prop${index}`;
+}
+
+export function substituteExprsWithProps(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(entry.placeholder).join(`{${entry.prop}}`);
+  }
+  return out;
+}
+
+export function substitutePropsWithExprs(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(`{${entry.prop}}`).join(`{${entry.expr}}`);
+  }
+  return out;
+}
+
+export function parseSvelteComponentFile(content) {
+  const text = String(content || '');
+  const scriptMatch = text.match(/^([\s\S]*?)<script\b[^>]*>[\s\S]*?<\/script>/i);
+  const withoutScript = scriptMatch ? text.slice(scriptMatch[0].length) : text;
+  const styleMatch = withoutScript.match(/<style\b[^>]*>[\s\S]*?<\/style\s*>/i);
+  const styleBlock = styleMatch ? styleMatch[0] : '';
+  const markup = styleMatch
+    ? withoutScript.slice(0, styleMatch.index).trim()
+    : withoutScript.trim();
+  const cssLines = styleBlock
+    ? styleBlock
+      .replace(/^<style\b[^>]*>/i, '')
+      .replace(/<\/style\s*>$/i, '')
+      .split('\n')
+      .map((line) => line.trimEnd())
+    : [];
+  while (cssLines.length > 0 && cssLines[0].trim() === '') cssLines.shift();
+  while (cssLines.length > 0 && cssLines[cssLines.length - 1].trim() === '') cssLines.pop();
+  return { markup, cssLines, styleBlock };
+}
+
+function buildPropsScript(contract) {
+  if (contract.length === 0) {
+    return '<script>\n  /** @type {Record<string, never>} */\n  let {} = $props();\n</script>\n';
+  }
+  const names = contract.map((c) => c.prop).join(', ');
+  const typeFields = contract.map((c) => `    ${c.prop}: string;`).join('\n');
+  return `<script>\n  /** @type {{\n${typeFields}\n  }} */\n  let { ${names} } = $props();\n</script>\n`;
+}
+
+function buildVariantStub(variantNum, originalWithProps, contract) {
+  const propsComment = contract.length > 0
+    ? `\n<!-- Props: ${contract.map((c) => `${c.prop} <- {${c.expr}}`).join(', ')} -->\n`
+    : '';
+  return `${buildPropsScript(contract)}${propsComment}${originalWithProps.trim()}\n\n<style>\n  /* Variant ${variantNum}: add scoped CSS here */\n</style>\n`;
+}
+
+function buildInsertVariantStub(variantNum) {
+  return `${buildPropsScript([])}<div class="impeccable-insert-preview">Insert variant ${variantNum}</div>\n\n<style>\n  .impeccable-insert-preview { display: block; }\n</style>\n`;
+}
+
+export function scaffoldSvelteComponentSession({
+  id,
+  count,
+  sourceFile,
+  sourceStartLine,
+  sourceEndLine,
+  originalLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const originalMarkup = originalLines.join('\n');
+  const contract = buildPropContract(extractMustacheExpressions(originalMarkup));
+  const originalWithProps = substituteExprsWithProps(originalMarkup, contract);
+
+  const manifest = {
+    id,
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    sourceStartLine,
+    sourceEndLine,
+    count,
+    propContract: contract,
+    originalMarkup,
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildVariantStub(n, originalWithProps, contract), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: contract,
+  };
+}
+
+export function scaffoldSvelteComponentInsertSession({
+  id,
+  count,
+  sourceFile,
+  insertLine,
+  position,
+  anchorStartLine,
+  anchorEndLine,
+  anchorLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const anchorMarkup = (anchorLines || []).join('\n');
+  const manifest = {
+    id,
+    mode: 'insert',
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    insertLine,
+    position,
+    anchorStartLine,
+    anchorEndLine,
+    originalMarkup: anchorMarkup,
+    anchorMarkup,
+    count,
+    propContract: [],
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildInsertVariantStub(n), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: [],
+  };
+}
+
+export function findSvelteComponentManifest(id, cwd = process.cwd()) {
+  const direct = manifestPathForSession(id, cwd);
+  if (fs.existsSync(direct)) {
+    return readManifest(direct);
+  }
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return null;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    const candidate = path.join(root, entry.name, 'manifest.json');
+    if (!fs.existsSync(candidate)) continue;
+    try {
+      const manifest = readManifest(candidate);
+      if (manifest?.id === id) return { ...manifest, manifestPath: candidate };
+    } catch { /* skip */ }
+  }
+  return null;
+}
+
+export function readManifest(manifestPath) {
+  const data = JSON.parse(fs.readFileSync(manifestPath, 'utf-8'));
+  return {
+    ...data,
+    manifestPath,
+  };
+}
+
+export function resolveSourceFile(sourceFile, cwd = process.cwd()) {
+  if (!sourceFile || path.isAbsolute(sourceFile)) {
+    throw new Error('Invalid svelte-component source file');
+  }
+  const full = path.resolve(cwd, sourceFile);
+  const rel = path.relative(cwd, full);
+  if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) {
+    throw new Error('Svelte-component source file escapes project root');
+  }
+  if (!fs.existsSync(full)) {
+    throw new Error('Svelte-component source file not found: ' + sourceFile);
+  }
+  return full;
+}
+
+function appendCssToSvelteStyle(lines, cssLines) {
+  const closeIdx = findLastStyleCloseLine(lines);
+  const prepared = ['', ...cssLines.map((line) => (line.trim() === '' ? '' : '  ' + line.trimStart()))];
+  if (closeIdx === -1) {
+    return [...lines, '', '<style>', ...prepared.slice(1), '</style>'];
+  }
+  return [
+    ...lines.slice(0, closeIdx),
+    ...prepared,
+    ...lines.slice(closeIdx),
+  ];
+}
+
+function findLastStyleCloseLine(lines) {
+  for (let i = lines.length - 1; i >= 0; i--) {
+    if (/<\/style\s*>/.test(lines[i])) return i;
+  }
+  return -1;
+}
+
+function bakeParamValuesInCss(cssLines, paramValues) {
+  if (!paramValues || Object.keys(paramValues).length === 0) return cssLines;
+  return cssLines.map((line) => {
+    let out = line;
+    for (const [key, value] of Object.entries(paramValues)) {
+      const varName = `--p-${key}`;
+      out = out.replace(new RegExp(`var\\(${escapeRegExp(varName)}(?:,\\s*[^)]+)?\\)`, 'g'), String(value));
+    }
+    return out;
+  });
+}
+
+function sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues = null, rootTag = 'div') {
+  const css = String((cssLines || []).join('\n'));
+  if (!/data-impeccable-variant|impeccable-variant-ready/.test(css)) return cssLines;
+
+  const rules = parseCssRules(css);
+  const output = [];
+  for (const rule of rules) {
+    appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag);
+  }
+  return output.join('\n')
+    .split('\n')
+    .map((line) => line.trimEnd())
+    .filter((line) => line.trim() !== '');
+}
+
+function appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag) {
+  const prelude = rule.prelude.trim();
+  const body = rule.body.trim();
+  if (!prelude || !body || /--impeccable-variant-ready\s*:/.test(body)) return;
+
+  if (/^@scope\b/i.test(prelude)) {
+    if (/data-impeccable-variant/.test(prelude) && !selectorHasVariant(prelude, variantNum)) return;
+    const inner = parseCssRules(body);
+    for (const innerRule of inner) {
+      const rewrittenPrelude = rewriteAcceptedSvelteSelector(innerRule.prelude, variantNum, paramValues, rootTag, true);
+      if (!rewrittenPrelude || /--impeccable-variant-ready\s*:/.test(innerRule.body)) continue;
+      output.push(formatCssRule(rewrittenPrelude, innerRule.body.trim()));
+    }
+    return;
+  }
+
+  const rewrittenPrelude = rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, false);
+  if (!rewrittenPrelude) return;
+  output.push(formatCssRule(rewrittenPrelude, body));
+}
+
+function parseCssRules(css) {
+  const rules = [];
+  const text = String(css || '');
+  let i = 0;
+  while (i < text.length) {
+    while (i < text.length && /\s/.test(text[i])) i++;
+    const preludeStart = i;
+    while (i < text.length && text[i] !== '{') i++;
+    if (i >= text.length) break;
+    const prelude = text.slice(preludeStart, i).trim();
+    i++;
+    const bodyStart = i;
+    let depth = 1;
+    let quote = null;
+    let comment = false;
+    while (i < text.length && depth > 0) {
+      const ch = text[i];
+      const next = text[i + 1];
+      if (comment) {
+        if (ch === '*' && next === '/') {
+          comment = false;
+          i += 2;
+          continue;
+        }
+        i++;
+        continue;
+      }
+      if (quote) {
+        if (ch === '\\') {
+          i += 2;
+          continue;
+        }
+        if (ch === quote) quote = null;
+        i++;
+        continue;
+      }
+      if (ch === '/' && next === '*') {
+        comment = true;
+        i += 2;
+        continue;
+      }
+      if (ch === '"' || ch === "'") {
+        quote = ch;
+        i++;
+        continue;
+      }
+      if (ch === '{') depth++;
+      else if (ch === '}') depth--;
+      i++;
+    }
+    const body = text.slice(bodyStart, Math.max(bodyStart, i - 1));
+    if (prelude) rules.push({ prelude, body });
+  }
+  return rules;
+}
+
+function rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, fromScope) {
+  const selectors = splitSelectorList(prelude);
+  const rewritten = [];
+  for (const selector of selectors) {
+    const next = rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope);
+    if (next) rewritten.push(next);
+  }
+  return rewritten.join(', ');
+}
+
+function rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope) {
+  let out = selector.trim();
+  const hasVariant = /data-impeccable-variant/.test(out);
+  if (hasVariant && !selectorHasVariant(out, variantNum)) return '';
+  if (hasVariant) {
+    out = out.replace(variantSelectorRegex(variantNum), '');
+    out = out.replace(/\[data-impeccable-variant=(["']).*?\1\]/g, '');
+  }
+
+  const paramResult = rewriteParamSelectors(out, paramValues);
+  if (!paramResult.keep) return '';
+  out = paramResult.selector;
+
+  out = out
+    .replace(/:scope(?:\[[^\]]+\])?\s*>\s*/g, '')
+    .replace(/:scope(?:\[[^\]]+\])?/g, rootTag || '')
+    .replace(/\s+/g, ' ')
+    .trim();
+
+  out = out.replace(/^[>+~]\s*/, '').trim();
+  if (!out && (hasVariant || fromScope)) return rootTag || ':global(*)';
+  return out;
+}
+
+function rewriteParamSelectors(selector, paramValues) {
+  let keep = true;
+  const next = selector.replace(/\[data-p-([A-Za-z0-9_-]+)(?:=(["'])(.*?)\2)?\]/g, (_match, key, _quote, expected) => {
+    if (!paramValues || !Object.prototype.hasOwnProperty.call(paramValues, key)) return '';
+    const actual = paramValues[key];
+    if (expected != null && String(actual) !== String(expected)) {
+      keep = false;
+      return '';
+    }
+    if (expected == null && (actual === false || actual == null || actual === 'false' || actual === 'off' || actual === '0')) {
+      keep = false;
+      return '';
+    }
+    return '';
+  });
+  return { keep, selector: next };
+}
+
+function splitSelectorList(prelude) {
+  const selectors = [];
+  let start = 0;
+  let bracket = 0;
+  let paren = 0;
+  let quote = null;
+  for (let i = 0; i < prelude.length; i++) {
+    const ch = prelude[i];
+    if (quote) {
+      if (ch === '\\') i++;
+      else if (ch === quote) quote = null;
+      continue;
+    }
+    if (ch === '"' || ch === "'") {
+      quote = ch;
+      continue;
+    }
+    if (ch === '[') bracket++;
+    else if (ch === ']') bracket = Math.max(0, bracket - 1);
+    else if (ch === '(') paren++;
+    else if (ch === ')') paren = Math.max(0, paren - 1);
+    else if (ch === ',' && bracket === 0 && paren === 0) {
+      selectors.push(prelude.slice(start, i));
+      start = i + 1;
+    }
+  }
+  selectors.push(prelude.slice(start));
+  return selectors;
+}
+
+function selectorHasVariant(selector, variantNum) {
+  return variantSelectorRegex(variantNum).test(selector);
+}
+
+function variantSelectorRegex(variantNum) {
+  return new RegExp(`\\[data-impeccable-variant=(["'])${escapeRegExp(String(variantNum))}\\1\\]`, 'g');
+}
+
+function formatCssRule(selector, body) {
+  return `${selector} { ${body.trim()} }`;
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+export function inlineSvelteComponentAccept(manifest, variantNum, paramValues = null, cwd = process.cwd()) {
+  const sourceFile = resolveSourceFile(manifest.sourceFile, cwd);
+  const variantPath = path.join(cwd, manifest.componentDir, `v${variantNum}.svelte`);
+  const resultBase = {
+    file: manifest.sourceFile,
+    sourceFile: manifest.sourceFile,
+    previewMode: 'svelte-component',
+    componentDir: manifest.componentDir,
+    carbonize: false,
+  };
+  if (!fs.existsSync(variantPath)) {
+    return { handled: false, error: `Variant ${variantNum} not found`, ...resultBase };
+  }
+
+  const { markup, cssLines } = parseSvelteComponentFile(fs.readFileSync(variantPath, 'utf-8'));
+  if (manifest.mode === 'insert') {
+    return inlineSvelteComponentInsertAccept({
+      manifest,
+      markup,
+      cssLines,
+      variantNum,
+      paramValues,
+      sourceFile,
+      resultBase,
+      cwd,
+    });
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const contract = manifest.propContract || [];
+  const mergedMarkup = mergeOriginalTopLevelAttrs(markup, manifest.originalMarkup || '');
+  const restoredMarkup = substitutePropsWithExprs(mergedMarkup, contract)
+    .split('\n')
+    .map((line) => line.trimEnd());
+
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const start = Number(manifest.sourceStartLine) - 1;
+  const end = Number(manifest.sourceEndLine) - 1;
+  if (!Number.isInteger(start) || !Number.isInteger(end) || start < 0 || end < start || end >= sourceLines.length) {
+    return { handled: false, error: 'Invalid source line range for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const indent = sourceLines[start].match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, start),
+    ...indentedMarkup,
+    ...sourceLines.slice(end + 1),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function inlineSvelteComponentInsertAccept({
+  manifest,
+  markup,
+  cssLines,
+  variantNum,
+  paramValues,
+  sourceFile,
+  resultBase,
+  cwd,
+}) {
+  if (!svelteMarkupHasVisibleContent(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant is empty', ...resultBase };
+  }
+  if (/\bdata-impeccable-[\w-]*\s*=/.test(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant contains preview-only data-impeccable attributes', ...resultBase };
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const restoredMarkup = String(markup || '')
+    .split('\n')
+    .map((line) => line.trimEnd());
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const insertIndex = Number(manifest.insertLine) - 1;
+  if (!Number.isInteger(insertIndex) || insertIndex < 0 || insertIndex > sourceLines.length) {
+    return { handled: false, error: 'Invalid insert line for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const nearbyLine = sourceLines[insertIndex] ?? sourceLines[insertIndex - 1] ?? '';
+  const indent = nearbyLine.match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, insertIndex),
+    ...indentedMarkup,
+    ...sourceLines.slice(insertIndex),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function svelteMarkupHasVisibleContent(markup) {
+  const text = String(markup || '')
+    .replace(/<script[\s\S]*?<\/script>/gi, '')
+    .replace(/<style[\s\S]*?<\/style>/gi, '')
+    .replace(/<!--[\s\S]*?-->/g, '')
+    .replace(/<[^>]+>/g, ' ')
+    .replace(/\s+/g, ' ')
+    .trim();
+  if (text.length > 0) return true;
+  return /<(img|svg|canvas|video|audio|picture|input|button|select|textarea)\b/i.test(markup || '');
+}
+
+function mergeOriginalTopLevelAttrs(markup, originalMarkup) {
+  const variantOpen = matchOpeningTag(markup);
+  const originalOpen = matchOpeningTag(originalMarkup);
+  if (!variantOpen || !originalOpen) return markup;
+  if (variantOpen.tag.toLowerCase() !== originalOpen.tag.toLowerCase()) return markup;
+
+  const variantAttrs = parseAttrSegments(variantOpen.attrs);
+  const originalAttrs = parseAttrSegments(originalOpen.attrs);
+  const additions = [];
+  let attrs = variantOpen.attrs;
+
+  const originalClass = originalAttrs.get('class');
+  const variantClass = variantAttrs.get('class');
+  if (originalClass && variantClass) {
+    const merged = mergeStaticClassAttr(originalClass, variantClass);
+    if (merged) {
+      attrs = attrs.slice(0, variantClass.start) + merged + attrs.slice(variantClass.end);
+      variantAttrs.set('class', { ...variantClass, raw: merged });
+    }
+  } else if (originalClass && !variantClass) {
+    additions.push(originalClass.raw);
+  }
+
+  for (const [name, attr] of originalAttrs) {
+    if (name === 'class') continue;
+    if (!variantAttrs.has(name)) additions.push(attr.raw);
+  }
+
+  if (additions.length === 0 && attrs === variantOpen.attrs) return markup;
+  const nextOpen = variantOpen.prefix
+    + variantOpen.tag
+    + attrs
+    + additions.map((attr) => ' ' + attr.trim()).join('')
+    + variantOpen.close;
+  return markup.slice(0, variantOpen.index) + nextOpen + markup.slice(variantOpen.index + variantOpen.raw.length);
+}
+
+function matchOpeningTag(markup) {
+  const match = String(markup || '').match(/^(\s*<)([A-Za-z][\w:-]*)([^>]*?)(\/?>)/);
+  if (!match) return null;
+  return {
+    raw: match[0],
+    prefix: match[1],
+    tag: match[2],
+    attrs: match[3] || '',
+    close: match[4],
+    index: match.index || 0,
+  };
+}
+
+function parseAttrSegments(attrs) {
+  const out = new Map();
+  const re = /([A-Za-z_:][\w:.-]*)(?:\s*=\s*(?:"[^"]*"|'[^']*'|\{[^}]*\}|[^\s"'>=]+))?/g;
+  let match;
+  while ((match = re.exec(attrs))) {
+    const raw = match[0];
+    const name = match[1];
+    out.set(name, {
+      name,
+      raw,
+      start: match.index,
+      end: match.index + raw.length,
+    });
+  }
+  return out;
+}
+
+function mergeStaticClassAttr(originalClass, variantClass) {
+  const originalValue = originalClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  const variantValue = variantClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  if (!originalValue || !variantValue) return null;
+  const quote = variantValue[1];
+  const classes = [
+    ...variantValue[2].split(/\s+/),
+    ...originalValue[2].split(/\s+/),
+  ].filter(Boolean);
+  return `class=${quote}${[...new Set(classes)].join(' ')}${quote}`;
+}
+
+export function removeSvelteComponentSession(id, cwd = process.cwd()) {
+  const dir = componentSessionDir(id, cwd);
+  try {
+    fs.rmSync(dir, { recursive: true, force: true });
+  } catch { /* non-fatal */ }
+}
+
+export function removeAllSvelteComponentSessions(cwd = process.cwd()) {
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    if (entry.name.startsWith('__')) continue;
+    try {
+      fs.rmSync(path.join(root, entry.name), { recursive: true, force: true });
+    } catch { /* non-fatal */ }
+  }
+}
+
+export function deferredAcceptsPath(cwd = process.cwd()) {
+  const key = createHash('sha1').update(path.resolve(cwd)).digest('hex').slice(0, 16);
+  return path.join(os.tmpdir(), 'impeccable-live', key, 'deferred-svelte-component-accepts.json');
+}
+
+export function readDeferredAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  try {
+    return JSON.parse(fs.readFileSync(file, 'utf-8'));
+  } catch {
+    return { accepts: [] };
+  }
+}
+
+export function writeDeferredAccept(entry, cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  const data = readDeferredAccepts(cwd);
+  data.accepts = (data.accepts || []).filter((item) => item.id !== entry.id);
+  data.accepts.push({ ...entry, createdAt: new Date().toISOString() });
+  fs.writeFileSync(file, JSON.stringify(data, null, 2) + '\n', 'utf-8');
+}
+
+export function applyDeferredSvelteComponentAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  const data = readDeferredAccepts(cwd);
+  const pending = Array.isArray(data.accepts) ? data.accepts : [];
+  const results = [];
+  const remaining = [];
+  for (const entry of pending) {
+    try {
+      const manifest = findSvelteComponentManifest(entry.id, cwd);
+      if (!manifest) {
+        results.push({ id: entry.id, ok: false, error: 'manifest not found' });
+        remaining.push(entry);
+        continue;
+      }
+      const result = inlineSvelteComponentAccept(
+        manifest,
+        entry.variantNum,
+        entry.paramValues || null,
+        cwd,
+      );
+      results.push({ id: entry.id, ok: result.handled !== false, result });
+      if (result.handled === false) remaining.push(entry);
+    } catch (err) {
+      results.push({ id: entry.id, ok: false, error: err.message });
+      remaining.push(entry);
+    }
+  }
+  if (remaining.length > 0) {
+    fs.writeFileSync(file, JSON.stringify({ accepts: remaining }, null, 2) + '\n', 'utf-8');
+  } else {
+    try { fs.rmSync(file, { force: true }); } catch {}
+  }
+  return { applied: results.filter((r) => r.ok).length, failed: results.filter((r) => !r.ok).length, results };
+}
+
+export function buildSvelteComponentCssAuthoring(count) {
+  const variantNumbers = Array.from({ length: count }, (_, i) => i + 1);
+  return {
+    mode: 'svelte-component',
+    styleTag: null,
+    strategy: 'component-style-block',
+    rulePattern: '.semantic-class { ... }',
+    selectorExamples: variantNumbers.map(() => '.expense-row { padding: 22px; }'),
+    requirements: [
+      'Write each variant as a real Svelte component file (v1.svelte, v2.svelte, ...).',
+      'Keep the prop names from propContract; bind dynamic text with {propName}, not literal snapshot text.',
+      'Put variant CSS in the component <style> block using semantic class selectors.',
+      'Author param-driven CSS against var(--p-<id>, default) and [data-p-<id>] using :global(...) so the runtime knob values reach the mounted root.',
+      'Declare params in componentDir/params.json keyed by variant number (e.g. {"1": [...], "2": [...]}), NOT as a data-impeccable-params attribute.',
+      'Do not use @scope or data-impeccable-variant selectors in component files.',
+      'Do not edit the route source file during generation; only edit files under componentDir.',
+    ],
+    forbidden: [
+      'Do not use @scope blocks in Svelte component variants.',
+      'Do not copy live DOM snapshot text into markup when propContract provides bindings.',
+      'Do not add data-impeccable-* attributes inside component files. Svelte parses { in attribute values as an expression, so data-impeccable-params with JSON breaks the build; use componentDir/params.json instead.',
+    ],
+    paramsFile: 'params.json',
+  };
+}

.gemini/skills/impeccable/scripts/live-sveltekit-adapter.mjs

@@ -0,0 +1,274 @@
+/**
+ * SvelteKit live-mode adapter.
+ *
+ * SvelteKit must not be patched through src/app.html. That file is a document
+ * template, not framework-owned component chrome. The adapter keeps SvelteKit
+ * work limited to mounting a dev-only shadow host from +layout.svelte; the
+ * actual live UI remains the shared plain-DOM browser chrome.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+
+export const SVELTE_LIVE_ROOT_COMPONENT = 'src/lib/impeccable/ImpeccableLiveRoot.svelte';
+export const SVELTE_LAYOUT_MARKER_OPEN = '<!-- impeccable-live-svelte-start -->';
+export const SVELTE_LAYOUT_MARKER_CLOSE = '<!-- impeccable-live-svelte-end -->';
+export const SVELTE_ROOT_IMPORT = "import ImpeccableLiveRoot from '$lib/impeccable/ImpeccableLiveRoot.svelte';";
+
+export function detectSvelteKitProject(cwd = process.cwd(), config = null) {
+  const appHtml = findSvelteKitAppHtml(cwd, config);
+  if (!appHtml) return null;
+  const hasTemplateMarkers = fileIncludes(path.join(cwd, appHtml), '%sveltekit.body%')
+    && fileIncludes(path.join(cwd, appHtml), '%sveltekit.head%');
+  if (!hasTemplateMarkers) return null;
+
+  const hasSvelteConfig = fs.existsSync(path.join(cwd, 'svelte.config.js'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.mjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.cjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.ts'));
+  const hasKitPackage = packageHasSvelteKit(cwd);
+  if (!hasSvelteConfig && !hasKitPackage) return null;
+
+  return {
+    appHtml,
+    layoutFile: findSvelteKitLayout(cwd),
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function applySvelteKitLiveAdapter({ cwd = process.cwd(), port, config = null } = {}) {
+  if (!Number.isFinite(Number(port))) {
+    throw new Error('SvelteKit live adapter requires a numeric port');
+  }
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  ensureSvelteLiveRootComponent(cwd, Number(port));
+
+  const layoutRel = detected.layoutFile;
+  const layoutAbs = path.join(cwd, layoutRel);
+  fs.mkdirSync(path.dirname(layoutAbs), { recursive: true });
+  const layoutExisted = fs.existsSync(layoutAbs);
+  const before = layoutExisted ? fs.readFileSync(layoutAbs, 'utf-8') : defaultSvelteLayout();
+  const after = patchSvelteLayout(before);
+  fs.writeFileSync(layoutAbs, after, 'utf-8');
+
+  return {
+    file: layoutRel,
+    adapter: 'sveltekit',
+    inserted: after !== before || !layoutExisted,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function removeSvelteKitLiveAdapter({ cwd = process.cwd(), config = null } = {}) {
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  const layoutAbs = path.join(cwd, detected.layoutFile);
+  let removed = false;
+  if (fs.existsSync(layoutAbs)) {
+    const before = fs.readFileSync(layoutAbs, 'utf-8');
+    const after = unpatchSvelteLayout(before);
+    if (after !== before) {
+      fs.writeFileSync(layoutAbs, after, 'utf-8');
+      removed = true;
+    }
+  }
+
+  const rootAbs = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  if (fs.existsSync(rootAbs)) {
+    fs.rmSync(rootAbs, { force: true });
+    removed = true;
+  }
+
+  pruneEmptyDir(path.dirname(rootAbs), path.join(cwd, 'src'));
+
+  return {
+    file: detected.layoutFile,
+    adapter: 'sveltekit',
+    removed,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function patchSvelteLayout(content) {
+  let out = String(content || '');
+  if (!out.includes(SVELTE_ROOT_IMPORT)) {
+    const scriptMatch = out.match(/<script(?:\s[^>]*)?>/i);
+    if (scriptMatch) {
+      const insertAt = scriptMatch.index + scriptMatch[0].length;
+      out = out.slice(0, insertAt) + '\n  ' + SVELTE_ROOT_IMPORT + out.slice(insertAt);
+    } else {
+      out = `<script>\n  ${SVELTE_ROOT_IMPORT}\n</script>\n\n` + out;
+    }
+  }
+
+  if (!out.includes(SVELTE_LAYOUT_MARKER_OPEN)) {
+    const block = `${SVELTE_LAYOUT_MARKER_OPEN}\n<ImpeccableLiveRoot />\n${SVELTE_LAYOUT_MARKER_CLOSE}\n`;
+    const renderMatch = out.match(/\{@render\s+children(?:\?\.)?\(\)\s*\}/);
+    const slotMatch = out.match(/<slot\s*\/?>/);
+    const match = renderMatch || slotMatch;
+    if (match) {
+      out = out.slice(0, match.index) + block + out.slice(match.index);
+    } else {
+      out = out.replace(/\s*$/, '\n\n' + block);
+    }
+  }
+
+  return out;
+}
+
+export function unpatchSvelteLayout(content) {
+  let out = String(content || '');
+  const blockRe = new RegExp(
+    '([ \\t]*)' + escapeRegExp(SVELTE_LAYOUT_MARKER_OPEN)
+    + '\\n<ImpeccableLiveRoot\\s*/>\\n'
+    + escapeRegExp(SVELTE_LAYOUT_MARKER_CLOSE)
+    + '\\n?',
+    'g',
+  );
+  out = out.replace(blockRe, '$1');
+  out = out.replace(new RegExp('^\\s*' + escapeRegExp(SVELTE_ROOT_IMPORT) + '\\s*\\n?', 'gm'), '');
+  out = out.replace(/<script>\s*<\/script>\s*\n?/g, '');
+  return out.replace(/\n{3,}/g, '\n\n');
+}
+
+export function ensureSvelteLiveRootComponent(cwd, port) {
+  const file = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, buildSvelteLiveRootComponent(port), 'utf-8');
+  return file;
+}
+
+export function buildSvelteLiveRootComponent(port) {
+  return `<script>
+  import { onMount } from 'svelte';
+
+  const LIVE_URL = 'http://localhost:${Number(port)}/live.js';
+  const HOST_ID = 'impeccable-live-root';
+
+  onMount(() => {
+    let host = document.querySelector('impeccable-live-root#' + HOST_ID) || document.getElementById(HOST_ID);
+    if (!host) {
+      host = document.createElement('impeccable-live-root');
+      host.id = HOST_ID;
+      document.body.appendChild(host);
+    }
+
+    host.dataset.impeccableLiveAdapter = 'sveltekit';
+    host.style.setProperty('all', 'initial', 'important');
+    host.style.setProperty('display', 'block', 'important');
+    host.style.setProperty('position', 'fixed', 'important');
+    host.style.setProperty('top', '0', 'important');
+    host.style.setProperty('left', '0', 'important');
+    host.style.setProperty('width', '0', 'important');
+    host.style.setProperty('height', '0', 'important');
+    host.style.setProperty('overflow', 'visible', 'important');
+    host.style.setProperty('z-index', '2147483000', 'important');
+    host.style.setProperty('pointer-events', 'none', 'important');
+
+    const root = host.shadowRoot || host.attachShadow({ mode: 'open' });
+    if (!root.querySelector('style[data-impeccable-live-reset]')) {
+      const reset = document.createElement('style');
+      reset.dataset.impeccableLiveReset = 'true';
+      reset.textContent = ':host, :host *, * { box-sizing: border-box; }';
+      root.appendChild(reset);
+    }
+
+    window.__IMPECCABLE_LIVE_ADAPTER__ = 'sveltekit';
+    window.__IMPECCABLE_LIVE_UI_ROOT__ = root;
+    window.__IMPECCABLE_LIVE_CHROME_MOUNT__ = {
+      adapter: 'sveltekit',
+      version: 1,
+      host,
+      root,
+    };
+
+    const script = document.createElement('script');
+    script.src = LIVE_URL;
+    script.async = true;
+    script.dataset.impeccableLiveScript = 'true';
+    document.head.appendChild(script);
+
+    return () => {
+      script.remove();
+      if (window.__IMPECCABLE_LIVE_UI_ROOT__ === root) delete window.__IMPECCABLE_LIVE_UI_ROOT__;
+      if (window.__IMPECCABLE_LIVE_CHROME_MOUNT__?.root === root) delete window.__IMPECCABLE_LIVE_CHROME_MOUNT__;
+      if (window.__IMPECCABLE_LIVE_ADAPTER__ === 'sveltekit') delete window.__IMPECCABLE_LIVE_ADAPTER__;
+    };
+  });
+</script>
+`;
+}
+
+function findSvelteKitAppHtml(cwd, config) {
+  const files = Array.isArray(config?.files) ? config.files : ['src/app.html'];
+  for (const rel of files) {
+    if (rel.includes('*')) continue;
+    const normalized = rel.split(path.sep).join('/');
+    if (!normalized.endsWith('app.html')) continue;
+    const abs = path.join(cwd, normalized);
+    if (fs.existsSync(abs)) return normalized;
+  }
+  const fallback = 'src/app.html';
+  return fs.existsSync(path.join(cwd, fallback)) ? fallback : null;
+}
+
+function findSvelteKitLayout(cwd) {
+  const candidates = [
+    'src/routes/+layout.svelte',
+    'src/routes/(app)/+layout.svelte',
+  ];
+  for (const rel of candidates) {
+    if (fs.existsSync(path.join(cwd, rel))) return rel;
+  }
+  return 'src/routes/+layout.svelte';
+}
+
+function defaultSvelteLayout() {
+  return `<script>\n  let { children } = $props();\n</script>\n\n{@render children?.()}\n`;
+}
+
+function packageHasSvelteKit(cwd) {
+  const file = path.join(cwd, 'package.json');
+  if (!fs.existsSync(file)) return false;
+  try {
+    const pkg = JSON.parse(fs.readFileSync(file, 'utf-8'));
+    const deps = {
+      ...(pkg.dependencies || {}),
+      ...(pkg.devDependencies || {}),
+      ...(pkg.peerDependencies || {}),
+    };
+    return Boolean(deps['@sveltejs/kit'] || deps['@sveltejs/vite-plugin-svelte'] || deps.svelte);
+  } catch {
+    return false;
+  }
+}
+
+function fileIncludes(file, text) {
+  try {
+    return fs.readFileSync(file, 'utf-8').includes(text);
+  } catch {
+    return false;
+  }
+}
+
+function pruneEmptyDir(dir, stopDir) {
+  let current = dir;
+  while (current.startsWith(stopDir) && current !== stopDir) {
+    try {
+      if (fs.readdirSync(current).length > 0) return;
+      fs.rmdirSync(current);
+      current = path.dirname(current);
+    } catch {
+      return;
+    }
+  }
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}

.gemini/skills/impeccable/scripts/live-ui-core.mjs

@@ -0,0 +1,179 @@
+/**
+ * Framework-neutral Impeccable live chrome contract.
+ *
+ * The production browser bundle is intentionally plain DOM so Svelte, React,
+ * Vue, and static adapters can all mount the same chrome. This module is the
+ * testable contract/inventory for that bundle; live-browser.js mirrors these
+ * values at runtime because it is served as a standalone script.
+ */
+
+export const LIVE_CHROME_MOUNT_CONTRACT = Object.freeze([
+  'root',
+  'transport',
+  'state',
+  'actions',
+]);
+
+export const LIVE_UI_SURFACES = Object.freeze([
+  {
+    key: 'global-bottom-bar',
+    ids: [
+      'impeccable-live-global-bar',
+      'impeccable-live-global-bar-brand',
+      'impeccable-live-pick-toggle',
+      'impeccable-live-insert-toggle',
+      'impeccable-live-detect-toggle',
+      'impeccable-live-detect-badge',
+      'impeccable-live-design-toggle',
+      'impeccable-live-page-chat',
+      'impeccable-live-page-chat-input',
+      'impeccable-live-page-chat-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'active', 'tooltip'],
+  },
+  {
+    key: 'pending-copy-edit-dock',
+    ids: ['impeccable-live-pending-dock'],
+    states: ['closed', 'open', 'hover', 'pressed', 'loading', 'rollback', 'keep-fixing'],
+  },
+  {
+    key: 'element-selection-chrome',
+    ids: [
+      'impeccable-live-highlight',
+      'impeccable-live-tooltip',
+      'impeccable-live-bar',
+      'impeccable-live-configure-input-wrap',
+      'impeccable-live-input',
+      'impeccable-live-configure-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'disabled'],
+  },
+  {
+    key: 'action-picker',
+    ids: ['impeccable-live-picker'],
+    states: ['closed', 'open', 'option-hover', 'option-focus'],
+  },
+  {
+    key: 'edit-chrome',
+    ids: ['impeccable-live-edit-badge'],
+    states: ['enabled', 'disabled', 'editing', 'cancel', 'save', 'edited-content'],
+  },
+  {
+    key: 'generating-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-shader'],
+    states: ['action-label', 'animated-dots', 'generating', 'done'],
+  },
+  {
+    key: 'variant-cycling-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-params-panel'],
+    states: ['variant-1', 'variant-2', 'variant-3', 'left-disabled', 'right-disabled', 'dot-click', 'accept', 'discard'],
+  },
+  {
+    key: 'variant-params-panel',
+    ids: ['impeccable-live-params-panel'],
+    states: ['closed', 'open-above', 'open-below', 'range', 'steps', 'toggle'],
+  },
+  {
+    key: 'saving-confirmed-rows',
+    ids: ['impeccable-live-bar'],
+    states: ['saving', 'applying-variant', 'confirmed'],
+  },
+  {
+    key: 'insert-mode-chrome',
+    ids: [
+      'impeccable-live-insert-line',
+      'impeccable-live-insert-placeholder',
+      'impeccable-live-placeholder-resize',
+      'impeccable-live-insert-input',
+      'impeccable-live-insert-voice',
+      'impeccable-live-insert-create',
+      'impeccable-live-insert-create-tooltip',
+    ],
+    states: ['toggle-active', 'line', 'placeholder', 'resize', 'enabled', 'disabled', 'tooltip'],
+  },
+  {
+    key: 'annotation-chrome',
+    ids: [
+      'impeccable-live-annot',
+      'impeccable-live-annot-svg',
+      'impeccable-live-annot-pins',
+      'impeccable-live-annot-clear',
+    ],
+    states: ['overlay', 'drawing', 'pin', 'pin-edit', 'clear'],
+  },
+  {
+    key: 'design-system-panel',
+    ids: ['impeccable-live-design-host'],
+    states: ['closed', 'open', 'tabs', 'token-tiles', 'copy'],
+  },
+  {
+    key: 'toasts-and-errors',
+    ids: ['impeccable-live-toast'],
+    states: ['normal', 'error', 'no-variants-mounted'],
+  },
+  {
+    key: 'css-isolation-boundary',
+    ids: ['impeccable-live-root'],
+    states: ['shadow-root', 'style-tags', 'hostile-css'],
+  },
+]);
+
+export const LIVE_UI_COMPONENT_IDS = Object.freeze([
+  ...new Set(LIVE_UI_SURFACES.flatMap((surface) => surface.ids)),
+]);
+
+export function resolveLiveUiRoot(env = globalThis) {
+  const doc = env?.document;
+  const explicit = env?.__IMPECCABLE_LIVE_UI_ROOT__
+    || env?.window?.__IMPECCABLE_LIVE_UI_ROOT__;
+  if (explicit && typeof explicit.appendChild === 'function') return explicit;
+  return doc?.body || null;
+}
+
+export function getLiveUiElementById(id, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (!id) return null;
+  if (root?.getElementById) {
+    const found = root.getElementById(id);
+    if (found) return found;
+  }
+  if (root?.querySelector) {
+    const found = root.querySelector('#' + escapeCssIdent(id));
+    if (found) return found;
+  }
+  return doc?.getElementById?.(id) || null;
+}
+
+export function appendToLiveUiRoot(el, env = globalThis) {
+  const root = resolveLiveUiRoot(env);
+  if (!root) throw new Error('Impeccable live UI root is not available');
+  root.appendChild(el);
+  return el;
+}
+
+export function appendStyleToLiveUiRoot(styleEl, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (root && root !== doc?.body) {
+    root.appendChild(styleEl);
+  } else {
+    (doc?.head || doc?.body || root).appendChild(styleEl);
+  }
+  return styleEl;
+}
+
+export function activeElementDeep(doc = globalThis.document) {
+  let active = doc?.activeElement || null;
+  while (active?.shadowRoot?.activeElement) {
+    active = active.shadowRoot.activeElement;
+  }
+  return active;
+}
+
+function escapeCssIdent(value) {
+  if (typeof CSS !== 'undefined' && typeof CSS.escape === 'function') {
+    return CSS.escape(String(value));
+  }
+  return String(value).replace(/([ !"#$%&'()*+,./:;<=>?@[\\\]^`{|}~])/g, '\\$1');
+}

.gemini/skills/impeccable/scripts/live-wrap.mjs

@@ -15,6 +15,11 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -262,6 +267,8 @@ The agent should insert variant HTML at insertLine.`);
     .map((l) => (l.trim() === '' ? '' : indent + extra + l.slice(originalBaseIndent)))
     .join('\n');
   const originalIndented = reindentOriginal('    ');
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+  const useSvelteComponent = shouldUseSvelteComponentInjection(targetFile);
 
   // Wrapper attributes differ by syntax. HTML allows plain string attrs;
   // JSX requires object-literal style and parses string attrs as HTML (which
@@ -302,38 +309,75 @@ The agent should insert variant HTML at insertLine.`);
     indent + commentSyntax.open + ' impeccable-variants-end ' + id + ' ' + commentSyntax.close,
   ];
 
-  // Replace the original element with the wrapper
+  let outputFile = targetFile;
-  const newLines = [
+  let outputLines;
-    ...lines.slice(0, startLine),
+  let outputStartLine = startLine + 1;
-    ...wrapperLines,
+  let outputEndLine = startLine + wrapperLines.length + (originalLines.length - 1);
-    ...lines.slice(endLine + 1),
+  let insertLine;
-  ];
+  let svelteSession = null;
-  fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
 
-  // Calculate insert line (the "insert below this line" comment).
+  if (useSvelteComponent) {
-  // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // Svelte/SvelteKit resets component-local state on markup HMR updates.
-  // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // Keep generation source-neutral: agents write real variant components
-  // original-div + content + close-original-div; JSX: outer-div +
+    // under the generated componentDir, the browser mounts them into the live
-  // start-comment + Original-comment + original-div + content +
+    // DOM, and live-accept.mjs inlines the accepted variant back into the route.
-  // close-original-div). Multi-line originals push the marker by their
+    svelteSession = scaffoldSvelteComponentSession({
-  // extra line count.
+      id,
-  const insertLine = startLine + 6 + (originalLines.length - 1);
+      count,
+      sourceFile: relTargetFile,
+      sourceStartLine: startLine + 1,
+      sourceEndLine: endLine + 1,
+      originalLines,
+      cwd: process.cwd(),
+    });
+    outputFile = path.resolve(process.cwd(), svelteSession.manifestFile);
+    outputStartLine = 1;
+    outputEndLine = 1;
+    insertLine = 1;
+  } else {
+    // Replace the original element with the wrapper
+    const newLines = [
+      ...lines.slice(0, startLine),
+      ...wrapperLines,
+      ...lines.slice(endLine + 1),
+    ];
+    fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
+
+    // Calculate insert line (the "insert below this line" comment).
+    // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // original-div + content + close-original-div; JSX: outer-div +
+    // start-comment + Original-comment + original-div + content +
+    // close-original-div). Multi-line originals push the marker by their
+    // extra line count.
+    insertLine = startLine + 6 + (originalLines.length - 1) + 1;
+  }
+
+  const outputRelFile = path.relative(process.cwd(), outputFile).split(path.sep).join('/');
+
+  const svelteComponentAuthoring = useSvelteComponent ? buildSvelteComponentCssAuthoring(count) : null;
 
   console.log(JSON.stringify({
-    file: path.relative(process.cwd(), targetFile),
+    file: outputRelFile,
-    startLine: startLine + 1,       // 1-indexed for the agent
+    sourceFile: useSvelteComponent ? relTargetFile : undefined,
+    previewMode: useSvelteComponent ? 'svelte-component' : undefined,
+    componentDir: svelteSession?.componentDir,
+    propContract: svelteSession?.propContract,
+    sourceStartLine: useSvelteComponent ? startLine + 1 : undefined,
+    sourceEndLine: useSvelteComponent ? endLine + 1 : undefined,
+    startLine: outputStartLine,       // 1-indexed for the agent
     // wrapperLines is an array but one element (the original-content slot)
     // is a `\n`-joined multi-line string, so the actual file-row count is
     // wrapperLines.length + (originalLines.length - 1). Without the offset,
     // endLine pointed inside the wrapper for any picked element that
     // spanned more than one source line.
-    endLine: startLine + wrapperLines.length + (originalLines.length - 1), // 1-indexed
+    endLine: outputEndLine, // 1-indexed
-    insertLine: insertLine + 1,     // 1-indexed: where variants go
+    insertLine,            // 1-indexed: where variants go
     commentSyntax: commentSyntax,
-    styleMode: styleMode.mode,
+    styleMode: useSvelteComponent ? 'svelte-component' : styleMode.mode,
-    styleTag: styleMode.styleTag,
+    styleTag: useSvelteComponent ? null : styleMode.styleTag,
-    cssSelectorPrefixExamples: buildCssSelectorPrefixExamples(styleMode.mode, count),
+    cssSelectorPrefixExamples: useSvelteComponent ? [] : buildCssSelectorPrefixExamples(styleMode.mode, count),
-    cssAuthoring: buildCssAuthoring(styleMode, count),
+    cssAuthoring: useSvelteComponent ? svelteComponentAuthoring : buildCssAuthoring(styleMode, count),
     originalLineCount: originalLines.length,
   }));
 }
@@ -527,6 +571,14 @@ function splitClassList(classes) {
   return String(classes).split(/[,\s]+/).map(c => c.trim()).filter(Boolean);
 }
 
+function attrEscapeDouble(str) {
+  return String(str)
+    .replace(/&/g, '&')
+    .replace(/"/g, '"')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;');
+}
+
 function detectCommentSyntax(filePath) {
   const ext = path.extname(filePath).toLowerCase();
   if (ext === '.jsx' || ext === '.tsx') {

.github/skills/impeccable/reference/live.md

@@ -111,7 +111,9 @@ node .github/skills/impeccable/scripts/live-insert.mjs --id EVENT_ID --count EVE
 
 The scaffold has **no** `data-impeccable-variant="original"`. Variants are net-new HTML+CSS inserted at `insertLine`. Load `brand.md` or `product.md` (freeform only, no action sub-command). Write all variants in one edit, then `--reply done`.
 
-On accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
+For Svelte/SvelteKit targets, `live-insert.mjs` returns `previewMode: "svelte-component"` with `mode: "insert"`, `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each inserted variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`. Insert variants must be non-empty net-new content with a single top-level root, no `data-impeccable-*` attributes, and CSS in each component's `<style>` block. Do **not** edit the route source during generation; the browser mounts the temporary component before/after the live anchor while the user cycles variants. On Accept, `live-accept.mjs` inserts the selected component markup into `sourceFile` immediately and deletes the temp session after the source write succeeds.
+
+For non-Svelte targets, on accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
 
 ### Replace mode (default)
 
@@ -149,6 +151,25 @@ If `--text` matches multiple candidates equally well, wrap exits with `{ error:
 
 Output on success: `{ file, insertLine, commentSyntax, styleMode, styleTag, cssSelectorPrefixExamples, cssAuthoring }`.
 
+For Svelte/SvelteKit targets, `live-wrap.mjs` returns `previewMode: "svelte-component"` with `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`; use the `propContract` prop names for dynamic text (`{propName}`), not literal snapshot strings. Put variant CSS in each component's `<style>` block with semantic class selectors (no `@scope`, no `data-impeccable-*`). Reply with `--file` set to the manifest path; the browser dynamically imports and mounts the compiled components so Svelte HMR does not reset page state while the user cycles variants. On Accept, `live-accept.mjs` inlines the accepted component back into `sourceFile` immediately after source promotion succeeds.
+
+**Params on the Svelte component path go in a sidecar, never as an attribute.** Svelte parses `{` inside an attribute value as the start of an expression, so a `data-impeccable-params='[{…}]'` attribute on a component element fails to compile (`Expected token }`). Declare params for this path in `componentDir/params.json`, keyed by variant number, using the exact param schema from section 7:
+
+```json
+{
+  "1": [
+    {"id":"density","kind":"steps","default":"snug","label":"Density","options":[
+      {"value":"airy","label":"Airy"},{"value":"snug","label":"Snug"},{"value":"packed","label":"Packed"}
+    ]}
+  ],
+  "2": [
+    {"id":"accent","kind":"range","min":0,"max":1,"step":0.05,"default":0.5,"label":"Accent"}
+  ]
+}
+```
+
+Author the component `<style>` against `var(--p-<id>, default)` for `range`/`toggle` and `[data-p-<id>="…"]` for `steps`; wrap those selectors in `:global(...)` so the knob values the runtime sets on the mounted root reach your rules. The browser reads `params.json`, docks the panel, and drives `--p-*` / `data-p-*` on the mounted component exactly as it does for the HTML/JSX path.
+
 `styleMode` controls how preview CSS must be authored. Treat it as a detected capability mode, not a framework guess:
 
 - `scoped`: use `@scope ([data-impeccable-variant="N"])` rules.
@@ -340,7 +361,7 @@ Each variant can expose **coarse** knobs alongside the full HTML/CSS replacement
 
 **Hard cap per variant**: at most **four** parameters so the panel stays legible; rare fifth only if the reference explicitly allows it.
 
-**How to declare.** Put a JSON manifest on the variant wrapper:
+**How to declare.** Put a JSON manifest on the variant wrapper (HTML/JSX path). **On the Svelte `svelte-component` path, do not use this attribute** (Svelte can't compile `{` inside an attribute value). Declare params in `componentDir/params.json` keyed by variant number instead (see the Svelte component paragraph in the wrap section). The param schema below is identical for both paths.
 
 ```html
 <div data-impeccable-variant="1" data-impeccable-params='[
@@ -454,7 +475,7 @@ Do these five steps in the current thread, synchronously, before the next poll.
 1. **Locate the carbonize block** in the source file (`_acceptResult.file`). It's bracketed by `<!-- impeccable-carbonize-start SESSION_ID -->` and `<!-- impeccable-carbonize-end SESSION_ID -->` and contains a `<style data-impeccable-css="SESSION_ID">` element. If the variant declared parameters, an `<!-- impeccable-param-values SESSION_ID: {...} -->` comment sits alongside the style tag with the user's chosen values; read it first; it drives steps 3 and 4 below.
 2. **Move the CSS rules** into the project's real stylesheet. Which stylesheet depends on the project (e.g. `site/styles/workflow.css` for an Astro project, or the component's co-located CSS file for a Vite/Next project; pick whichever already owns styling for the surrounding element).
 3. **Bake in parameter values while rewriting selectors.** For `@scope ([data-impeccable-variant="N"])` wrappers: retarget to real, semantic classes on the accepted HTML (`.why-visual--v2 .v2-label { … }`). For `:scope[data-p-<id>="VALUE"]` selectors: keep only the branch matching the chosen value from the param-values comment; drop the others (they're dead after accept). For `var(--p-<id>, DEFAULT)` in the CSS: either substitute the literal value, or if the param is still useful as a knob going forward, leave the var and update its initial declaration to the chosen value.
-4. **Unwrap the accepted content.** Delete the `<div data-impeccable-variant="N" style="display: contents">` that wraps it. Drop `data-impeccable-params` and any `data-p-*` attributes from it; those are live-mode plumbing, not source.
+4. **Unwrap the accepted content.** Delete the inner `<div data-impeccable-variant="N" style="display: contents">` that wraps it. On JSX/TSX, also delete the outer `<div data-impeccable-carbonize="SESSION_ID" style={{ display: 'contents' }}>` wrapper if present (accept adds it so ternary/`return` slots keep a single root). Drop `data-impeccable-params` and any `data-p-*` attributes; those are live-mode plumbing, not source.
 5. **Delete the inline `<style>` block, the `<!-- impeccable-param-values -->` comment if present, and both `<!-- impeccable-carbonize-start/end -->` markers.** Also drop any `@scope` rules for variants other than the accepted one; those are dead code now.
 
 After the file is clean, run `live-complete.mjs --id SESSION_ID`, verify it reports `phase: "completed"`, then poll again.

.github/skills/impeccable/scripts/live-accept.mjs

@@ -17,6 +17,12 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer, writeBuffer as writeManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  findSvelteComponentManifest,
+  inlineSvelteComponentAccept,
+  removeSvelteComponentSession,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -41,6 +47,9 @@ Required:
 
 Options:
   --page-url URL     Current browser page URL; scopes staged copy-edit cleanup
+  --defer-source-write
+                     Deprecated compatibility flag. Svelte component accepts
+                     now write the real source immediately.
 
 Output (JSON):
   { handled, file, carbonize }`);
@@ -64,18 +73,67 @@ Output (JSON):
 
   // Find the file containing this session's markers
   const found = findSessionFile(id, process.cwd());
-  if (!found) {
+  const svelteComponentManifest = found ? null : findSvelteComponentManifest(id, process.cwd());
+
+  if (!found && !svelteComponentManifest) {
     console.log(JSON.stringify({ handled: false, error: 'Session markers not found for id: ' + id }));
     process.exit(0);
   }
 
+  if (svelteComponentManifest) {
+    if (isDiscard) {
+      removeSvelteComponentSession(id, process.cwd());
+      console.log(JSON.stringify({
+        handled: true,
+        file: svelteComponentManifest.sourceFile,
+        carbonize: false,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      }));
+      return;
+    }
+
+    let result;
+    try {
+      result = inlineSvelteComponentAccept(
+        svelteComponentManifest,
+        variantNum,
+        paramValues,
+        process.cwd(),
+      );
+    } catch (err) {
+      result = {
+        handled: false,
+        error: err.message,
+        file: svelteComponentManifest.sourceFile,
+        sourceFile: svelteComponentManifest.sourceFile,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      };
+    }
+    if (result.carbonize) {
+      result.todo = 'REQUIRED before next poll: carbonize cleanup in ' + result.file + '. See reference/live.md "Required after accept".';
+    }
+    console.log(JSON.stringify({ handled: result.handled !== false, ...result }));
+    return;
+  }
+
   const { file: targetFile, content, lines } = found;
   const relFile = path.relative(process.cwd(), targetFile);
+  const previewBlock = findMarkerBlock(id, lines);
+  const sourceShadowPreview = previewBlock
+    ? readSourceShadowPreviewMeta(content, id)
+    : null;
+
+  if (sourceShadowPreview) {
+    console.log(JSON.stringify({
+      handled: false,
+      error: 'source_shadow_preview_deprecated',
+      hint: 'Svelte live mode now uses svelte-component injection. Re-wrap the element and regenerate variants.',
+    }));
+    process.exit(0);
+  }
 
-  // Bail if the session lives in a generated file. The agent manually wrote
-  // the wrapper there for preview, and is responsible for writing the
-  // accepted variant to true source (or cleaning up on discard). See
-  // "Handle fallback" in live.md.
   if (isGeneratedFile(targetFile, { cwd: process.cwd() })) {
     console.log(JSON.stringify({
       handled: false,
@@ -207,6 +265,71 @@ function handleDiscard(id, lines, targetFile) {
 // Accept
 // ---------------------------------------------------------------------------
 
+/**
+ * Build carbonize stitch-in lines. JSX targets occupy a single child slot
+ * (ternary branch, return value, etc.) — the same constraint as live-wrap.
+ * When isJsx, tuck markers + <style> + variant wrapper inside one outer
+ * <div data-impeccable-carbonize> so the slot keeps a single root node.
+ */
+function buildCarbonizeReplacement({
+  indent,
+  commentSyntax,
+  isJsx,
+  id,
+  variantNum,
+  cssContent,
+  paramValues,
+  restored,
+}) {
+  const lines = [];
+  if (!cssContent) {
+    lines.push(...restored);
+    return lines;
+  }
+
+  const variantStyleAttr = isJsx
+    ? "style={{ display: 'contents' }}"
+    : 'style="display: contents"';
+
+  const pushCarbonizeBody = (bodyIndent) => {
+    const bodyRestored = reindentContent(restored, indent, bodyIndent + '  ');
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    for (const cssLine of cssContent) {
+      lines.push(bodyIndent + cssLine.trimStart());
+    }
+    lines.push(bodyIndent + (isJsx ? '`}</style>' : '</style>'));
+    if (paramValues && Object.keys(paramValues).length > 0) {
+      lines.push(
+        bodyIndent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close,
+      );
+    }
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<div data-impeccable-variant="' + variantNum + '" ' + variantStyleAttr + '>');
+    lines.push(...bodyRestored);
+    lines.push(bodyIndent + '</div>');
+  };
+
+  if (isJsx) {
+    const wrapperStyle = 'style={{ display: "contents" }}';
+    lines.push(indent + '<div data-impeccable-carbonize="' + id + '" ' + wrapperStyle + '>');
+    pushCarbonizeBody(indent + '  ');
+    lines.push(indent + '</div>');
+  } else {
+    pushCarbonizeBody(indent);
+  }
+
+  return lines;
+}
+
+function reindentContent(contentLines, fromIndent, toIndent) {
+  return contentLines.map((line) => {
+    if (line.trim() === '') return '';
+    if (line.startsWith(fromIndent)) return toIndent + line.slice(fromIndent.length);
+    return toIndent + line.trimStart();
+  });
+}
+
 function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const block = findMarkerBlock(id, lines);
   if (!block) return { handled: false, error: 'Markers not found' };
@@ -235,45 +358,17 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const hasHelperAttrs = variantText.includes('data-impeccable-variant');
   const needsCarbonize = !!(cssContent || hasHelperAttrs);
 
-  // Build the replacement
   const restored = deindentContent(variantContent, indent);
-  const replacement = [];
+  const replacement = buildCarbonizeReplacement({
-
+    indent,
-  if (cssContent) {
+    commentSyntax,
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    isJsx,
-    // JSX targets need the CSS body wrapped in a template literal so that the
+    id,
-    // `{` and `}` in CSS rules don't get parsed as JSX expressions.
+    variantNum,
-    replacement.push(indent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    cssContent,
-    // Re-indent CSS content to match
+    paramValues,
-    for (const cssLine of cssContent) {
+    restored,
-      replacement.push(indent + cssLine.trimStart());
+  });
-    }
-    replacement.push(indent + (isJsx ? '`}</style>' : '</style>'));
-    if (paramValues && Object.keys(paramValues).length > 0) {
-      // Preserve the user's knob positions for the carbonize-cleanup agent
-      // to bake into the final CSS when it collapses scoped rules.
-      replacement.push(indent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close);
-    }
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
-  }
-
-  // Keep the `@scope ([data-impeccable-variant="N"])` selectors in the
-  // carbonize CSS block working visually by re-wrapping the accepted content
-  // in a data-impeccable-variant="N" div with `display: contents` (so layout
-  // isn't affected). The carbonize agent strips this attribute + wrapper when
-  // it moves the CSS to a proper stylesheet.
-  //
-  // Style attribute syntax has to follow the host file's flavor — JSX files
-  // need the object form, otherwise React 19 throws "Failed to set indexed
-  // property [0] on CSSStyleDeclaration" while parsing the string char-by-char.
-  if (cssContent) {
-    const styleAttr = isJsx ? "style={{ display: 'contents' }}" : 'style="display: contents"';
-    replacement.push(indent + '<div data-impeccable-variant="' + variantNum + '" ' + styleAttr + '>');
-    replacement.push(...restored);
-    replacement.push(indent + '</div>');
-  } else {
-    replacement.push(...restored);
-  }
 
   const newLines = [
     ...lines.slice(0, replaceRange.start),
@@ -285,6 +380,34 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   return { carbonize: needsCarbonize, acceptedOriginalText: originalContent.join('\n') };
 }
 
+function readSourceShadowPreviewMeta(content, id) {
+  const escaped = escapeRegExp(id);
+  const wrapperRe = new RegExp('<[^>]+data-impeccable-variants=(["\'])' + escaped + '\\1[^>]*>');
+  const match = String(content || '').match(wrapperRe);
+  if (!match) return null;
+  const tag = match[0];
+  if (readHtmlAttr(tag, 'data-impeccable-preview') !== 'source-shadow') return null;
+  const sourceFile = readHtmlAttr(tag, 'data-impeccable-source-file');
+  const sourceStartLine = Number(readHtmlAttr(tag, 'data-impeccable-source-start'));
+  const sourceEndLine = Number(readHtmlAttr(tag, 'data-impeccable-source-end'));
+  if (!sourceFile || !Number.isFinite(sourceStartLine) || !Number.isFinite(sourceEndLine)) return null;
+  return { sourceFile, sourceStartLine, sourceEndLine };
+}
+
+function readHtmlAttr(tag, name) {
+  const match = String(tag || '').match(new RegExp('\\s' + escapeRegExp(name) + '\\s*=\\s*(["\'])(.*?)\\1'));
+  if (!match) return null;
+  return decodeHtmlAttr(match[2]);
+}
+
+function decodeHtmlAttr(value) {
+  return String(value || '')
+    .replace(/&quot;/g, '"')
+    .replace(/&lt;/g, '<')
+    .replace(/&gt;/g, '>')
+    .replace(/&amp;/g, '&');
+}
+
 // ---------------------------------------------------------------------------
 // Parsing helpers
 // ---------------------------------------------------------------------------
@@ -686,4 +809,4 @@ if (_running?.endsWith('live-accept.mjs') || _running?.endsWith('live-accept.mjs
   acceptCli();
 }
 
-export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock };
+export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock, applyDeferredSvelteComponentAccepts };

.github/skills/impeccable/scripts/live-completion.mjs

@@ -3,6 +3,7 @@ export function completionTypeForAcceptResult(eventType, acceptResult) {
   if (acceptResult?.handled === true && acceptResult?.carbonize === true) return 'agent_done';
   if (acceptResult?.handled === true) return 'complete';
   if (acceptResult?.mode === 'error') return 'error';
+  if (eventType === 'accept' && acceptResult?.previewMode === 'svelte-component') return 'error';
   return 'agent_done';
 }
 

.github/skills/impeccable/scripts/live-inject.mjs

@@ -17,11 +17,38 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { resolveLiveConfigPath } from './impeccable-paths.mjs';
+import {
+  applySvelteKitLiveAdapter,
+  detectSvelteKitProject,
+  removeSvelteKitLiveAdapter,
+} from './live-sveltekit-adapter.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const CONFIG_PATH = resolveLiveConfigPath({ cwd: process.cwd(), scriptsDir: __dirname });
 const MARKER_OPEN_TEXT = 'impeccable-live-start';
 const MARKER_CLOSE_TEXT = 'impeccable-live-end';
+const IGNORE_MARKER_OPEN = '# impeccable-live-ignore-start';
+const IGNORE_MARKER_CLOSE = '# impeccable-live-ignore-end';
+
+export const LIVE_IGNORE_PATTERNS = Object.freeze([
+  '.impeccable/hook.cache.json',
+  '.impeccable/live/server.json',
+  '.impeccable/live/sessions/',
+  '.impeccable/live/previews/',
+  '.impeccable/live/annotations/',
+  '.impeccable/live/cache/',
+  '.impeccable/live/manual-edit-apply-transaction.json',
+  '.impeccable/live/manual-edit-events.jsonl',
+  '.impeccable/live/manual-edit-evidence/',
+  '.impeccable/live/pending-manual-edits.json',
+  '.impeccable/live/deferred-svelte-component-accepts.json',
+  '.impeccable-live.json',
+  '.impeccable-live/',
+  'node_modules/.impeccable-live/',
+  'src/lib/impeccable/ImpeccableLiveRoot.svelte',
+  'src/lib/impeccable/__runtime.js',
+  'src/lib/impeccable/[0-9a-f]*/',
+]);
 
 /**
  * Hard-excluded directory patterns. These are NEVER user-facing pages and
@@ -83,8 +110,14 @@ Output (JSON):
   validateConfig(config);
 
   const resolvedFiles = resolveFiles(process.cwd(), config);
+  const svelteKit = detectSvelteKitProject(process.cwd(), config);
 
   if (args.includes('--remove')) {
+    if (svelteKit) {
+      const adapterResult = removeSvelteKitLiveAdapter({ cwd: process.cwd(), config });
+      console.log(JSON.stringify({ ok: true, adapter: 'sveltekit', results: [adapterResult] }));
+      return;
+    }
     const results = resolvedFiles.map((relFile) => {
       const absFile = path.resolve(process.cwd(), relFile);
       if (!fs.existsSync(absFile)) return { file: relFile, error: 'file_not_found' };
@@ -110,6 +143,13 @@ Output (JSON):
     console.error(JSON.stringify({ ok: false, error: 'missing_port' }));
     process.exit(1);
   }
+  const gitIgnore = ensureLiveGitIgnores(process.cwd());
+
+  if (svelteKit) {
+    const adapterResult = applySvelteKitLiveAdapter({ cwd: process.cwd(), port, config });
+    console.log(JSON.stringify({ ok: true, port, adapter: 'sveltekit', gitIgnore, results: [adapterResult] }));
+    return;
+  }
 
   const results = resolvedFiles.map((relFile) => {
     const absFile = path.resolve(process.cwd(), relFile);
@@ -129,10 +169,68 @@ Output (JSON):
     };
   });
   const anyInserted = results.some((r) => r.inserted);
-  console.log(JSON.stringify({ ok: anyInserted, port, results }));
+  console.log(JSON.stringify({ ok: anyInserted, port, gitIgnore, results }));
   if (!anyInserted) process.exit(1);
 }
 
+export function ensureLiveGitIgnores(cwd = process.cwd()) {
+  const target = resolveIgnoreTarget(cwd);
+  const existing = fs.existsSync(target.path) ? fs.readFileSync(target.path, 'utf-8') : '';
+  const block = [
+    IGNORE_MARKER_OPEN,
+    ...LIVE_IGNORE_PATTERNS,
+    IGNORE_MARKER_CLOSE,
+  ].join('\n');
+  const markerRe = new RegExp(`${escapeRegExp(IGNORE_MARKER_OPEN)}[\\s\\S]*?${escapeRegExp(IGNORE_MARKER_CLOSE)}`);
+
+  let updated;
+  if (markerRe.test(existing)) {
+    updated = existing.replace(markerRe, block);
+  } else {
+    const prefix = existing.length === 0 ? '' : existing.endsWith('\n') ? existing : existing + '\n';
+    updated = `${prefix}${prefix.endsWith('\n\n') || prefix === '' ? '' : '\n'}${block}\n`;
+  }
+
+  if (updated !== existing) {
+    fs.mkdirSync(path.dirname(target.path), { recursive: true });
+    fs.writeFileSync(target.path, updated, 'utf-8');
+  }
+
+  return {
+    file: path.relative(cwd, target.path).split(path.sep).join('/'),
+    mode: target.mode,
+    changed: updated !== existing,
+    patterns: [...LIVE_IGNORE_PATTERNS],
+  };
+}
+
+function resolveIgnoreTarget(cwd) {
+  const gitExcludePath = resolveGitInfoExcludePath(cwd);
+  if (gitExcludePath) {
+    return { path: gitExcludePath, mode: 'git-info-exclude' };
+  }
+  return { path: path.join(cwd, '.gitignore'), mode: 'gitignore' };
+}
+
+function resolveGitInfoExcludePath(cwd) {
+  const dotGit = path.join(cwd, '.git');
+  if (!fs.existsSync(dotGit)) return null;
+
+  const stat = fs.statSync(dotGit);
+  if (stat.isDirectory()) return path.join(dotGit, 'info', 'exclude');
+  if (!stat.isFile()) return null;
+
+  const body = fs.readFileSync(dotGit, 'utf-8').trim();
+  const match = body.match(/^gitdir:\s*(.+)$/i);
+  if (!match) return null;
+  const gitDir = path.isAbsolute(match[1]) ? match[1] : path.resolve(cwd, match[1]);
+  return path.join(gitDir, 'info', 'exclude');
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
 /**
  * Expand config.files (which may contain glob patterns) into a literal list
  * of existing file paths relative to rootDir. Literal entries pass through;

.github/skills/impeccable/scripts/live-insert.mjs

@@ -21,6 +21,11 @@ import {
   buildCssAuthoring,
   buildCssSelectorPrefixExamples,
 } from './live-wrap.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentInsertSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const INSERT_POSITIONS = new Set(['before', 'after']);
 
@@ -192,6 +197,41 @@ Output (JSON):
   const styleMode = detectStyleMode(targetFile);
   const isJsx = commentSyntax.open === '{/*';
   const spliceIndex = computeInsertLine(startLine, endLine, position);
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+
+  if (shouldUseSvelteComponentInjection(targetFile)) {
+    const session = scaffoldSvelteComponentInsertSession({
+      id,
+      count,
+      sourceFile: relTargetFile,
+      insertLine: spliceIndex + 1,
+      position,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      anchorLines: lines.slice(startLine, endLine + 1),
+      cwd: process.cwd(),
+    });
+    console.log(JSON.stringify({
+      mode: 'insert',
+      position,
+      file: session.manifestFile,
+      sourceFile: relTargetFile,
+      previewMode: 'svelte-component',
+      componentDir: session.componentDir,
+      propContract: session.propContract,
+      insertLine: 1,
+      sourceInsertLine: spliceIndex + 1,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      commentSyntax,
+      styleMode: 'svelte-component',
+      styleTag: null,
+      cssSelectorPrefixExamples: [],
+      cssAuthoring: buildSvelteComponentCssAuthoring(count),
+    }));
+    return;
+  }
+
   const indent = lines[spliceIndex]?.match(/^(\s*)/)?.[1]
     ?? lines[startLine]?.match(/^(\s*)/)?.[1]
     ?? '';
@@ -216,7 +256,7 @@ Output (JSON):
   console.log(JSON.stringify({
     mode: 'insert',
     position,
-    file: path.relative(process.cwd(), targetFile),
+    file: relTargetFile,
     insertLine: insertLine + 1,
     commentSyntax,
     styleMode: styleMode.mode,

.github/skills/impeccable/scripts/live-poll.mjs

@@ -20,6 +20,7 @@ import { readLiveServerInfo } from './impeccable-paths.mjs';
 // that ceiling and loop in `pollOnce` to synthesize a long poll without
 // depending on the standalone undici package.
 export const PER_REQUEST_TIMEOUT_MS = 270_000;
+export const DEFAULT_EVENT_LEASE_MS = 600_000;
 
 const EVENT_TYPES_NEEDING_AGENT_REPLY = new Set(['generate', 'steer', 'manual_edit_apply']);
 
@@ -156,7 +157,7 @@ export async function fetchNextEvent(base, token, { totalDeadline } = {}) {
       ? totalDeadline - Date.now()
       : PER_REQUEST_TIMEOUT_MS;
     const slice = Math.min(Math.max(remaining, 1000), PER_REQUEST_TIMEOUT_MS);
-    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}`);
+    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}&leaseMs=${DEFAULT_EVENT_LEASE_MS}`);
 
     if (res.status === 401) {
       const err = new Error('Authentication failed. The server token may have changed.');
@@ -317,7 +318,7 @@ Modes:
 Options:
   --timeout=MS        One-shot poll timeout in ms (default: 600000). Ignored in --stream mode
   --ack-timeout=MS    Stream mode: max wait for --reply after generate/steer (default: 600000)
-  --file PATH         Attach a source file path to the reply (generate flow)
+  --file PATH         Attach a source file path to the reply (generate/steer flow)
   --data JSON         Attach a JSON result object to the reply (manual_edit_apply flow). Must be valid JSON
   --help              Show this help message
 

.github/skills/impeccable/scripts/live-server.mjs

@@ -42,6 +42,10 @@ import {
 } from './live-manual-edits-buffer.mjs';
 import { buildManualEditEvidence } from './live-manual-edit-evidence.mjs';
 import { commitManualEdits } from './live-commit-manual-edits.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  removeAllSvelteComponentSessions,
+} from './live-svelte-component.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 // PRODUCT.md / DESIGN.md live wherever context.mjs resolves. The generated
@@ -103,6 +107,7 @@ const MIN_MANUAL_EDIT_APPLY_CHUNK_SIZE = 1;
 const MAX_MANUAL_EDIT_APPLY_CHUNK_SIZE = 20;
 const MANUAL_APPLY_COMPACT_TEXT_LIMIT = 240;
 const MANUAL_APPLY_COMPACT_NEARBY_LIMIT = 4;
+const POLL_LEASE_EXPIRY_TIMER_GRACE_MS = 2;
 const DEBUG_MANUAL_EDIT_EVENTS = /^(1|true|yes)$/i.test(process.env.IMPECCABLE_LIVE_DEBUG_EVENTS || '');
 
 function tombstoneTimedOutApplyId(eventId, details = {}) {
@@ -897,6 +902,8 @@ function leaseEvent(entry, leaseMs) {
     return entry.event;
   }
   entry.leaseUntil = Date.now() + leaseMs;
+  scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return entry.event;
 }
 
@@ -907,9 +914,16 @@ function acknowledgePendingEvent(id) {
   const acknowledged = state.pendingEvents[idx].event;
   state.pendingEvents.splice(idx, 1);
   scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return acknowledged;
 }
 
+function findPendingEventById(id) {
+  if (!id) return null;
+  const entry = state.pendingEvents.find((item) => item.event?.id === id);
+  return entry?.event || null;
+}
+
 function manualApplyReplyCommand(eventOrId = 'EVENT_ID') {
   const id = typeof eventOrId === 'string' ? eventOrId : eventOrId?.id || 'EVENT_ID';
   return `live-poll.mjs --reply ${id} done --data '<json>'`;
@@ -955,6 +969,42 @@ function summarizePendingEventForStatus(entry) {
   return summary;
 }
 
+function summarizeActiveSessionForClient(snapshot = {}) {
+  return {
+    id: snapshot.id,
+    phase: snapshot.phase,
+    pageUrl: snapshot.pageUrl ?? null,
+    sourceFile: snapshot.sourceFile ?? null,
+    previewFile: snapshot.previewFile ?? null,
+    previewMode: snapshot.previewMode ?? null,
+    expectedVariants: snapshot.expectedVariants ?? 0,
+    arrivedVariants: snapshot.arrivedVariants ?? 0,
+    visibleVariant: snapshot.visibleVariant ?? null,
+    checkpointRevision: snapshot.checkpointRevision ?? 0,
+    paramValues: snapshot.paramValues || {},
+  };
+}
+
+function activeSessionSummaries() {
+  if (!state.sessionStore) return [];
+  return state.sessionStore.listActiveSessions().map((snapshot) => summarizeActiveSessionForClient(snapshot));
+}
+
+function cancelQueuedAnonymousExitEvents() {
+  let removed = 0;
+  for (let i = state.pendingEvents.length - 1; i >= 0; i -= 1) {
+    const event = state.pendingEvents[i]?.event;
+    if (event?.type !== 'exit' || event.id) continue;
+    state.pendingEvents.splice(i, 1);
+    removed += 1;
+  }
+  if (removed > 0) {
+    scheduleLeaseFlush();
+    broadcastAgentPollingIfChanged();
+  }
+  return removed;
+}
+
 function cancelPendingManualApplyEvents(pageUrl, reason = 'manual_edit_discarded') {
   const canceledById = new Map();
   const shouldCancel = (event) => event?.type === 'manual_edit_apply' && (!pageUrl || event.pageUrl === pageUrl);
@@ -1001,7 +1051,6 @@ function scheduleLeaseFlush() {
     clearTimeout(state.leaseTimer);
     state.leaseTimer = null;
   }
-  if (state.pendingPolls.length === 0) return;
   const now = Date.now();
   const nextLeaseUntil = state.pendingEvents
     .map((entry) => entry.leaseUntil || 0)
@@ -1011,7 +1060,8 @@ function scheduleLeaseFlush() {
   state.leaseTimer = setTimeout(() => {
     state.leaseTimer = null;
     flushPendingPolls();
-  }, Math.max(0, nextLeaseUntil - now));
+    broadcastAgentPollingIfChanged();
+  }, Math.max(0, nextLeaseUntil - now + POLL_LEASE_EXPIRY_TIMER_GRACE_MS));
 }
 
 function flushPendingPolls() {
@@ -1032,7 +1082,9 @@ function flushPendingPolls() {
 }
 
 function agentPollingConnected() {
-  return state.pendingPolls.length > 0;
+  const now = Date.now();
+  return state.pendingPolls.length > 0
+    || state.pendingEvents.some((entry) => entry.leaseUntil && entry.leaseUntil > now);
 }
 
 function broadcastAgentPollingIfChanged() {
@@ -1318,7 +1370,7 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/status') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401, { 'Content-Type': 'application/json' }); res.end(JSON.stringify({ error: 'Unauthorized' })); return; }
-      const sessions = state.sessionStore ? state.sessionStore.listActiveSessions() : [];
+      const sessions = activeSessionSummaries();
       res.writeHead(200, { 'Content-Type': 'application/json' });
       res.end(JSON.stringify({
         status: 'ok',
@@ -1423,6 +1475,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/events' && req.method === 'GET') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401); res.end('Unauthorized'); return; }
+      clearTimeout(state.exitTimer);
+      state.exitTimer = null;
+      cancelQueuedAnonymousExitEvents();
       res.writeHead(200, {
         'Content-Type': 'text/event-stream',
         'Cache-Control': 'no-cache',
@@ -1432,10 +1487,10 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
         type: 'connected',
         hasProjectContext: hasProjectContext(),
         agentPolling: agentPollingConnected(),
+        activeSessions: activeSessionSummaries(),
       }) + '\n\n');
 
       state.sseClients.add(res);
-      clearTimeout(state.exitTimer);
 
       // Keepalive: SSE comment every 30s prevents silent connection drops.
       const heartbeat = setInterval(() => {
@@ -1827,6 +1882,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
             return;
           }
         }
+        if (msg.type === 'exit') {
+          cleanupSvelteComponentSessionsBeforeExit();
+        }
         if (msg.type !== 'checkpoint') {
           enqueueEvent(msg);
         }
@@ -1905,6 +1963,36 @@ function handlePollGet(req, res, url) {
   });
 }
 
+function sessionFileMetadataFromPollReply(file) {
+  if (!file || typeof file !== 'string') return { file };
+  const normalized = file.split(path.sep).join('/');
+  const base = { file: normalized };
+  if (!normalized.endsWith('/manifest.json') && normalized !== 'manifest.json') return base;
+  if (!normalized.includes('node_modules/.impeccable-live/') && !normalized.includes('src/lib/impeccable/')) return base;
+
+  let full;
+  try {
+    full = path.resolve(process.cwd(), normalized);
+    const rel = path.relative(process.cwd(), full);
+    if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) return base;
+  } catch {
+    return base;
+  }
+
+  try {
+    const manifest = JSON.parse(fs.readFileSync(full, 'utf-8'));
+    if (manifest?.previewMode !== 'svelte-component' || !manifest.sourceFile) return base;
+    return {
+      file: String(manifest.sourceFile).split(path.sep).join('/'),
+      sourceFile: String(manifest.sourceFile).split(path.sep).join('/'),
+      previewFile: normalized,
+      previewMode: 'svelte-component',
+    };
+  } catch {
+    return base;
+  }
+}
+
 function handlePollPost(req, res) {
   let body = '';
   req.on('data', (c) => { body += c; });
@@ -1965,6 +2053,16 @@ function handlePollPost(req, res) {
       res.end(JSON.stringify({ error: 'stale_manual_edit_apply_reply', ...rollback }));
       return;
     }
+    const pendingEventBeforeAck = findPendingEventById(msg.id);
+    if (pendingEventBeforeAck?.type === 'steer' && msg.type === 'steer_done'
+        && !msg.file && !(typeof msg.message === 'string' && msg.message.trim())) {
+      res.writeHead(400, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({
+        error: 'steer_done_requires_file_or_message',
+        hint: 'Reply with --file after writing source, or include a message explaining an intentional no-op.',
+      }));
+      return;
+    }
     const acknowledgedEvent = acknowledgePendingEvent(msg.id);
     let skipJournalReply = false;
     let existingSession = null;
@@ -1987,6 +2085,7 @@ function handlePollPost(req, res) {
       }));
       return;
     }
+    const replyFileMeta = sessionFileMetadataFromPollReply(msg.file);
     if (state.sessionStore && msg.id && !skipJournalReply) {
       try {
         const eventType = msg.type === 'steer_done'
@@ -2001,7 +2100,10 @@ function handlePollPost(req, res) {
         state.sessionStore.appendEvent({
           type: eventType,
           id: msg.id,
-          file: msg.file,
+          file: replyFileMeta.file,
+          sourceFile: replyFileMeta.sourceFile,
+          previewFile: replyFileMeta.previewFile,
+          previewMode: replyFileMeta.previewMode,
           message: msg.message,
           sourceEventType: acknowledgedEvent?.type,
           carbonize: msg.data?.carbonize === true,
@@ -2010,7 +2112,16 @@ function handlePollPost(req, res) {
     }
     flushPendingPolls();
     // Forward the reply to the browser via SSE
-    broadcast({ type: msg.type || 'done', id: msg.id, message: msg.message, file: msg.file, data: msg.data });
+    broadcast({
+      type: msg.type || 'done',
+      id: msg.id,
+      message: msg.message,
+      file: msg.file,
+      sourceFile: replyFileMeta.sourceFile,
+      previewFile: replyFileMeta.previewFile,
+      previewMode: replyFileMeta.previewMode,
+      data: msg.data,
+    });
     res.writeHead(200, { 'Content-Type': 'application/json' });
     res.end(JSON.stringify({ ok: true }));
   });
@@ -2023,6 +2134,7 @@ function handlePollPost(req, res) {
 let httpServer = null;
 
 function shutdown() {
+  cleanupSvelteComponentSessionsBeforeExit();
   removeLiveServerInfo(process.cwd());
   if (state.leaseTimer) clearTimeout(state.leaseTimer);
   state.leaseTimer = null;
@@ -2037,6 +2149,25 @@ function shutdown() {
   process.exit(0);
 }
 
+function cleanupSvelteComponentSessionsBeforeExit() {
+  try {
+    removeAllSvelteComponentSessions(process.cwd());
+  } catch (err) {
+    console.warn('[impeccable] Svelte component session cleanup failed:', err.message);
+  }
+}
+
+function applyLegacyDeferredAcceptsOnStartup() {
+  try {
+    const result = applyDeferredSvelteComponentAccepts(process.cwd());
+    if (result.applied > 0 || result.failed > 0) {
+      console.log('[impeccable] applied legacy deferred Svelte component accepts:', JSON.stringify(result));
+    }
+  } catch (err) {
+    console.warn('[impeccable] legacy deferred Svelte component accept apply failed:', err.message);
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Main
 // ---------------------------------------------------------------------------
@@ -2162,6 +2293,7 @@ rollbackManualApplyTransaction({
   cwd: process.cwd(),
   reason: 'manual_edit_server_start_recovered_abandoned_transaction',
 });
+applyLegacyDeferredAcceptsOnStartup();
 restorePendingEventsFromStore();
 pruneStaleManualApplyEvidence(process.cwd());
 const portArg = args.find(a => a.startsWith('--port='));

.github/skills/impeccable/scripts/live-session-store.mjs

@@ -106,6 +106,8 @@ function baseSnapshot(id) {
     phase: 'new',
     pageUrl: null,
     sourceFile: null,
+    previewFile: null,
+    previewMode: null,
     expectedVariants: 0,
     arrivedVariants: 0,
     visibleVariant: null,
@@ -177,8 +179,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
     case 'variants_ready':
     case 'agent_done':
       next.phase = event.carbonize === true ? 'carbonize_required' : 'variants_ready';
-      next.sourceFile = event.file ?? next.sourceFile;
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
-      next.arrivedVariants = event.arrivedVariants ?? (next.arrivedVariants ?? next.expectedVariants);
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.arrivedVariants = event.arrivedVariants ?? (next.expectedVariants || next.arrivedVariants || 0);
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       if (event.carbonize === true) {
@@ -190,12 +194,19 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       }
       break;
     case 'checkpoint':
+      if (COMPLETED_PHASES.has(next.phase)) {
+        next.diagnostics.push({ error: 'checkpoint_after_terminal_ignored', phase: event.phase ?? null, revision: event.revision ?? null });
+        break;
+      }
       if ((event.revision ?? 0) >= (next.checkpointRevision ?? 0)) {
         next.phase = event.phase ?? next.phase;
         next.checkpointRevision = event.revision ?? next.checkpointRevision;
         next.activeOwner = event.owner ?? next.activeOwner;
         next.arrivedVariants = event.arrivedVariants ?? next.arrivedVariants;
         next.visibleVariant = event.visibleVariant ?? next.visibleVariant;
+        next.sourceFile = event.sourceFile ?? next.sourceFile;
+        next.previewFile = event.previewFile ?? next.previewFile;
+        next.previewMode = event.previewMode ?? next.previewMode;
         if (event.paramValues) next.paramValues = { ...event.paramValues };
       } else {
         next.diagnostics.push({ error: 'stale_checkpoint_ignored', revision: event.revision });
@@ -223,6 +234,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'steer_done':
       next.phase = 'steer_done';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.message = event.message ?? next.message;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;
@@ -238,6 +253,9 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'complete':
       next.phase = 'completed';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;

.github/skills/impeccable/scripts/live-svelte-component.mjs

@@ -0,0 +1,826 @@
+/**
+ * Svelte live-mode component injection helpers.
+ *
+ * Variants are real .svelte components under node_modules/.impeccable-live/<session-id>/.
+ * The browser mounts them via Svelte 5 mount(); accept inlines the chosen
+ * variant back into the route source with props mapped to original bindings.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+import os from 'node:os';
+import { createHash } from 'node:crypto';
+
+export const SVELTE_COMPONENT_ROOT = 'node_modules/.impeccable-live';
+export const SVELTE_RUNTIME_FILE = `${SVELTE_COMPONENT_ROOT}/__runtime.js`;
+export const DEFERRED_ACCEPTS_FILE = '.impeccable/live/deferred-svelte-component-accepts.json';
+
+const MUSTACHE_RE = /\{([^{}]+)\}/g;
+
+export function shouldUseSvelteComponentInjection(filePath) {
+  if (/^(0|false|no)$/i.test(process.env.IMPECCABLE_LIVE_SVELTE_COMPONENT || '')) return false;
+  return path.extname(filePath).toLowerCase() === '.svelte';
+}
+
+export function componentSessionDir(id, cwd = process.cwd()) {
+  return path.join(cwd, SVELTE_COMPONENT_ROOT, id);
+}
+
+export function manifestPathForSession(id, cwd = process.cwd()) {
+  return path.join(componentSessionDir(id, cwd), 'manifest.json');
+}
+
+export function ensureRuntimeHelper(cwd = process.cwd()) {
+  const file = path.join(cwd, SVELTE_RUNTIME_FILE);
+  if (fs.existsSync(file)) return file;
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, `export { mount, unmount } from 'svelte';\n`, 'utf-8');
+  return file;
+}
+
+/**
+ * Extract ordered unique mustache expressions from markup (not inside <!-- -->).
+ */
+export function extractMustacheExpressions(text) {
+  const expressions = [];
+  const seen = new Set();
+  const lines = String(text || '').split('\n');
+  for (const line of lines) {
+    const trimmed = line.trim();
+    if (trimmed.startsWith('<!--')) continue;
+    let match;
+    MUSTACHE_RE.lastIndex = 0;
+    while ((match = MUSTACHE_RE.exec(line)) !== null) {
+      const expr = match[1].trim();
+      if (!expr || seen.has(expr)) continue;
+      seen.add(expr);
+      expressions.push(expr);
+    }
+  }
+  return expressions;
+}
+
+export function buildPropContract(expressions) {
+  return expressions.map((expr, index) => {
+    const derived = derivePropName(expr, index);
+    return {
+      prop: derived,
+      expr,
+      placeholder: `{${expr}}`,
+    };
+  });
+}
+
+function derivePropName(expr, index) {
+  const tail = expr.match(/(?:\.|\[)(\w+)\s*\]?$/);
+  if (tail && tail[1] && /^[A-Za-z_$][\w$]*$/.test(tail[1])) {
+    return tail[1];
+  }
+  return `prop${index}`;
+}
+
+export function substituteExprsWithProps(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(entry.placeholder).join(`{${entry.prop}}`);
+  }
+  return out;
+}
+
+export function substitutePropsWithExprs(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(`{${entry.prop}}`).join(`{${entry.expr}}`);
+  }
+  return out;
+}
+
+export function parseSvelteComponentFile(content) {
+  const text = String(content || '');
+  const scriptMatch = text.match(/^([\s\S]*?)<script\b[^>]*>[\s\S]*?<\/script>/i);
+  const withoutScript = scriptMatch ? text.slice(scriptMatch[0].length) : text;
+  const styleMatch = withoutScript.match(/<style\b[^>]*>[\s\S]*?<\/style\s*>/i);
+  const styleBlock = styleMatch ? styleMatch[0] : '';
+  const markup = styleMatch
+    ? withoutScript.slice(0, styleMatch.index).trim()
+    : withoutScript.trim();
+  const cssLines = styleBlock
+    ? styleBlock
+      .replace(/^<style\b[^>]*>/i, '')
+      .replace(/<\/style\s*>$/i, '')
+      .split('\n')
+      .map((line) => line.trimEnd())
+    : [];
+  while (cssLines.length > 0 && cssLines[0].trim() === '') cssLines.shift();
+  while (cssLines.length > 0 && cssLines[cssLines.length - 1].trim() === '') cssLines.pop();
+  return { markup, cssLines, styleBlock };
+}
+
+function buildPropsScript(contract) {
+  if (contract.length === 0) {
+    return '<script>\n  /** @type {Record<string, never>} */\n  let {} = $props();\n</script>\n';
+  }
+  const names = contract.map((c) => c.prop).join(', ');
+  const typeFields = contract.map((c) => `    ${c.prop}: string;`).join('\n');
+  return `<script>\n  /** @type {{\n${typeFields}\n  }} */\n  let { ${names} } = $props();\n</script>\n`;
+}
+
+function buildVariantStub(variantNum, originalWithProps, contract) {
+  const propsComment = contract.length > 0
+    ? `\n<!-- Props: ${contract.map((c) => `${c.prop} <- {${c.expr}}`).join(', ')} -->\n`
+    : '';
+  return `${buildPropsScript(contract)}${propsComment}${originalWithProps.trim()}\n\n<style>\n  /* Variant ${variantNum}: add scoped CSS here */\n</style>\n`;
+}
+
+function buildInsertVariantStub(variantNum) {
+  return `${buildPropsScript([])}<div class="impeccable-insert-preview">Insert variant ${variantNum}</div>\n\n<style>\n  .impeccable-insert-preview { display: block; }\n</style>\n`;
+}
+
+export function scaffoldSvelteComponentSession({
+  id,
+  count,
+  sourceFile,
+  sourceStartLine,
+  sourceEndLine,
+  originalLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const originalMarkup = originalLines.join('\n');
+  const contract = buildPropContract(extractMustacheExpressions(originalMarkup));
+  const originalWithProps = substituteExprsWithProps(originalMarkup, contract);
+
+  const manifest = {
+    id,
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    sourceStartLine,
+    sourceEndLine,
+    count,
+    propContract: contract,
+    originalMarkup,
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildVariantStub(n, originalWithProps, contract), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: contract,
+  };
+}
+
+export function scaffoldSvelteComponentInsertSession({
+  id,
+  count,
+  sourceFile,
+  insertLine,
+  position,
+  anchorStartLine,
+  anchorEndLine,
+  anchorLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const anchorMarkup = (anchorLines || []).join('\n');
+  const manifest = {
+    id,
+    mode: 'insert',
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    insertLine,
+    position,
+    anchorStartLine,
+    anchorEndLine,
+    originalMarkup: anchorMarkup,
+    anchorMarkup,
+    count,
+    propContract: [],
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildInsertVariantStub(n), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: [],
+  };
+}
+
+export function findSvelteComponentManifest(id, cwd = process.cwd()) {
+  const direct = manifestPathForSession(id, cwd);
+  if (fs.existsSync(direct)) {
+    return readManifest(direct);
+  }
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return null;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    const candidate = path.join(root, entry.name, 'manifest.json');
+    if (!fs.existsSync(candidate)) continue;
+    try {
+      const manifest = readManifest(candidate);
+      if (manifest?.id === id) return { ...manifest, manifestPath: candidate };
+    } catch { /* skip */ }
+  }
+  return null;
+}
+
+export function readManifest(manifestPath) {
+  const data = JSON.parse(fs.readFileSync(manifestPath, 'utf-8'));
+  return {
+    ...data,
+    manifestPath,
+  };
+}
+
+export function resolveSourceFile(sourceFile, cwd = process.cwd()) {
+  if (!sourceFile || path.isAbsolute(sourceFile)) {
+    throw new Error('Invalid svelte-component source file');
+  }
+  const full = path.resolve(cwd, sourceFile);
+  const rel = path.relative(cwd, full);
+  if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) {
+    throw new Error('Svelte-component source file escapes project root');
+  }
+  if (!fs.existsSync(full)) {
+    throw new Error('Svelte-component source file not found: ' + sourceFile);
+  }
+  return full;
+}
+
+function appendCssToSvelteStyle(lines, cssLines) {
+  const closeIdx = findLastStyleCloseLine(lines);
+  const prepared = ['', ...cssLines.map((line) => (line.trim() === '' ? '' : '  ' + line.trimStart()))];
+  if (closeIdx === -1) {
+    return [...lines, '', '<style>', ...prepared.slice(1), '</style>'];
+  }
+  return [
+    ...lines.slice(0, closeIdx),
+    ...prepared,
+    ...lines.slice(closeIdx),
+  ];
+}
+
+function findLastStyleCloseLine(lines) {
+  for (let i = lines.length - 1; i >= 0; i--) {
+    if (/<\/style\s*>/.test(lines[i])) return i;
+  }
+  return -1;
+}
+
+function bakeParamValuesInCss(cssLines, paramValues) {
+  if (!paramValues || Object.keys(paramValues).length === 0) return cssLines;
+  return cssLines.map((line) => {
+    let out = line;
+    for (const [key, value] of Object.entries(paramValues)) {
+      const varName = `--p-${key}`;
+      out = out.replace(new RegExp(`var\\(${escapeRegExp(varName)}(?:,\\s*[^)]+)?\\)`, 'g'), String(value));
+    }
+    return out;
+  });
+}
+
+function sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues = null, rootTag = 'div') {
+  const css = String((cssLines || []).join('\n'));
+  if (!/data-impeccable-variant|impeccable-variant-ready/.test(css)) return cssLines;
+
+  const rules = parseCssRules(css);
+  const output = [];
+  for (const rule of rules) {
+    appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag);
+  }
+  return output.join('\n')
+    .split('\n')
+    .map((line) => line.trimEnd())
+    .filter((line) => line.trim() !== '');
+}
+
+function appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag) {
+  const prelude = rule.prelude.trim();
+  const body = rule.body.trim();
+  if (!prelude || !body || /--impeccable-variant-ready\s*:/.test(body)) return;
+
+  if (/^@scope\b/i.test(prelude)) {
+    if (/data-impeccable-variant/.test(prelude) && !selectorHasVariant(prelude, variantNum)) return;
+    const inner = parseCssRules(body);
+    for (const innerRule of inner) {
+      const rewrittenPrelude = rewriteAcceptedSvelteSelector(innerRule.prelude, variantNum, paramValues, rootTag, true);
+      if (!rewrittenPrelude || /--impeccable-variant-ready\s*:/.test(innerRule.body)) continue;
+      output.push(formatCssRule(rewrittenPrelude, innerRule.body.trim()));
+    }
+    return;
+  }
+
+  const rewrittenPrelude = rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, false);
+  if (!rewrittenPrelude) return;
+  output.push(formatCssRule(rewrittenPrelude, body));
+}
+
+function parseCssRules(css) {
+  const rules = [];
+  const text = String(css || '');
+  let i = 0;
+  while (i < text.length) {
+    while (i < text.length && /\s/.test(text[i])) i++;
+    const preludeStart = i;
+    while (i < text.length && text[i] !== '{') i++;
+    if (i >= text.length) break;
+    const prelude = text.slice(preludeStart, i).trim();
+    i++;
+    const bodyStart = i;
+    let depth = 1;
+    let quote = null;
+    let comment = false;
+    while (i < text.length && depth > 0) {
+      const ch = text[i];
+      const next = text[i + 1];
+      if (comment) {
+        if (ch === '*' && next === '/') {
+          comment = false;
+          i += 2;
+          continue;
+        }
+        i++;
+        continue;
+      }
+      if (quote) {
+        if (ch === '\\') {
+          i += 2;
+          continue;
+        }
+        if (ch === quote) quote = null;
+        i++;
+        continue;
+      }
+      if (ch === '/' && next === '*') {
+        comment = true;
+        i += 2;
+        continue;
+      }
+      if (ch === '"' || ch === "'") {
+        quote = ch;
+        i++;
+        continue;
+      }
+      if (ch === '{') depth++;
+      else if (ch === '}') depth--;
+      i++;
+    }
+    const body = text.slice(bodyStart, Math.max(bodyStart, i - 1));
+    if (prelude) rules.push({ prelude, body });
+  }
+  return rules;
+}
+
+function rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, fromScope) {
+  const selectors = splitSelectorList(prelude);
+  const rewritten = [];
+  for (const selector of selectors) {
+    const next = rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope);
+    if (next) rewritten.push(next);
+  }
+  return rewritten.join(', ');
+}
+
+function rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope) {
+  let out = selector.trim();
+  const hasVariant = /data-impeccable-variant/.test(out);
+  if (hasVariant && !selectorHasVariant(out, variantNum)) return '';
+  if (hasVariant) {
+    out = out.replace(variantSelectorRegex(variantNum), '');
+    out = out.replace(/\[data-impeccable-variant=(["']).*?\1\]/g, '');
+  }
+
+  const paramResult = rewriteParamSelectors(out, paramValues);
+  if (!paramResult.keep) return '';
+  out = paramResult.selector;
+
+  out = out
+    .replace(/:scope(?:\[[^\]]+\])?\s*>\s*/g, '')
+    .replace(/:scope(?:\[[^\]]+\])?/g, rootTag || '')
+    .replace(/\s+/g, ' ')
+    .trim();
+
+  out = out.replace(/^[>+~]\s*/, '').trim();
+  if (!out && (hasVariant || fromScope)) return rootTag || ':global(*)';
+  return out;
+}
+
+function rewriteParamSelectors(selector, paramValues) {
+  let keep = true;
+  const next = selector.replace(/\[data-p-([A-Za-z0-9_-]+)(?:=(["'])(.*?)\2)?\]/g, (_match, key, _quote, expected) => {
+    if (!paramValues || !Object.prototype.hasOwnProperty.call(paramValues, key)) return '';
+    const actual = paramValues[key];
+    if (expected != null && String(actual) !== String(expected)) {
+      keep = false;
+      return '';
+    }
+    if (expected == null && (actual === false || actual == null || actual === 'false' || actual === 'off' || actual === '0')) {
+      keep = false;
+      return '';
+    }
+    return '';
+  });
+  return { keep, selector: next };
+}
+
+function splitSelectorList(prelude) {
+  const selectors = [];
+  let start = 0;
+  let bracket = 0;
+  let paren = 0;
+  let quote = null;
+  for (let i = 0; i < prelude.length; i++) {
+    const ch = prelude[i];
+    if (quote) {
+      if (ch === '\\') i++;
+      else if (ch === quote) quote = null;
+      continue;
+    }
+    if (ch === '"' || ch === "'") {
+      quote = ch;
+      continue;
+    }
+    if (ch === '[') bracket++;
+    else if (ch === ']') bracket = Math.max(0, bracket - 1);
+    else if (ch === '(') paren++;
+    else if (ch === ')') paren = Math.max(0, paren - 1);
+    else if (ch === ',' && bracket === 0 && paren === 0) {
+      selectors.push(prelude.slice(start, i));
+      start = i + 1;
+    }
+  }
+  selectors.push(prelude.slice(start));
+  return selectors;
+}
+
+function selectorHasVariant(selector, variantNum) {
+  return variantSelectorRegex(variantNum).test(selector);
+}
+
+function variantSelectorRegex(variantNum) {
+  return new RegExp(`\\[data-impeccable-variant=(["'])${escapeRegExp(String(variantNum))}\\1\\]`, 'g');
+}
+
+function formatCssRule(selector, body) {
+  return `${selector} { ${body.trim()} }`;
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+export function inlineSvelteComponentAccept(manifest, variantNum, paramValues = null, cwd = process.cwd()) {
+  const sourceFile = resolveSourceFile(manifest.sourceFile, cwd);
+  const variantPath = path.join(cwd, manifest.componentDir, `v${variantNum}.svelte`);
+  const resultBase = {
+    file: manifest.sourceFile,
+    sourceFile: manifest.sourceFile,
+    previewMode: 'svelte-component',
+    componentDir: manifest.componentDir,
+    carbonize: false,
+  };
+  if (!fs.existsSync(variantPath)) {
+    return { handled: false, error: `Variant ${variantNum} not found`, ...resultBase };
+  }
+
+  const { markup, cssLines } = parseSvelteComponentFile(fs.readFileSync(variantPath, 'utf-8'));
+  if (manifest.mode === 'insert') {
+    return inlineSvelteComponentInsertAccept({
+      manifest,
+      markup,
+      cssLines,
+      variantNum,
+      paramValues,
+      sourceFile,
+      resultBase,
+      cwd,
+    });
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const contract = manifest.propContract || [];
+  const mergedMarkup = mergeOriginalTopLevelAttrs(markup, manifest.originalMarkup || '');
+  const restoredMarkup = substitutePropsWithExprs(mergedMarkup, contract)
+    .split('\n')
+    .map((line) => line.trimEnd());
+
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const start = Number(manifest.sourceStartLine) - 1;
+  const end = Number(manifest.sourceEndLine) - 1;
+  if (!Number.isInteger(start) || !Number.isInteger(end) || start < 0 || end < start || end >= sourceLines.length) {
+    return { handled: false, error: 'Invalid source line range for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const indent = sourceLines[start].match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, start),
+    ...indentedMarkup,
+    ...sourceLines.slice(end + 1),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function inlineSvelteComponentInsertAccept({
+  manifest,
+  markup,
+  cssLines,
+  variantNum,
+  paramValues,
+  sourceFile,
+  resultBase,
+  cwd,
+}) {
+  if (!svelteMarkupHasVisibleContent(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant is empty', ...resultBase };
+  }
+  if (/\bdata-impeccable-[\w-]*\s*=/.test(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant contains preview-only data-impeccable attributes', ...resultBase };
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const restoredMarkup = String(markup || '')
+    .split('\n')
+    .map((line) => line.trimEnd());
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const insertIndex = Number(manifest.insertLine) - 1;
+  if (!Number.isInteger(insertIndex) || insertIndex < 0 || insertIndex > sourceLines.length) {
+    return { handled: false, error: 'Invalid insert line for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const nearbyLine = sourceLines[insertIndex] ?? sourceLines[insertIndex - 1] ?? '';
+  const indent = nearbyLine.match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, insertIndex),
+    ...indentedMarkup,
+    ...sourceLines.slice(insertIndex),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function svelteMarkupHasVisibleContent(markup) {
+  const text = String(markup || '')
+    .replace(/<script[\s\S]*?<\/script>/gi, '')
+    .replace(/<style[\s\S]*?<\/style>/gi, '')
+    .replace(/<!--[\s\S]*?-->/g, '')
+    .replace(/<[^>]+>/g, ' ')
+    .replace(/\s+/g, ' ')
+    .trim();
+  if (text.length > 0) return true;
+  return /<(img|svg|canvas|video|audio|picture|input|button|select|textarea)\b/i.test(markup || '');
+}
+
+function mergeOriginalTopLevelAttrs(markup, originalMarkup) {
+  const variantOpen = matchOpeningTag(markup);
+  const originalOpen = matchOpeningTag(originalMarkup);
+  if (!variantOpen || !originalOpen) return markup;
+  if (variantOpen.tag.toLowerCase() !== originalOpen.tag.toLowerCase()) return markup;
+
+  const variantAttrs = parseAttrSegments(variantOpen.attrs);
+  const originalAttrs = parseAttrSegments(originalOpen.attrs);
+  const additions = [];
+  let attrs = variantOpen.attrs;
+
+  const originalClass = originalAttrs.get('class');
+  const variantClass = variantAttrs.get('class');
+  if (originalClass && variantClass) {
+    const merged = mergeStaticClassAttr(originalClass, variantClass);
+    if (merged) {
+      attrs = attrs.slice(0, variantClass.start) + merged + attrs.slice(variantClass.end);
+      variantAttrs.set('class', { ...variantClass, raw: merged });
+    }
+  } else if (originalClass && !variantClass) {
+    additions.push(originalClass.raw);
+  }
+
+  for (const [name, attr] of originalAttrs) {
+    if (name === 'class') continue;
+    if (!variantAttrs.has(name)) additions.push(attr.raw);
+  }
+
+  if (additions.length === 0 && attrs === variantOpen.attrs) return markup;
+  const nextOpen = variantOpen.prefix
+    + variantOpen.tag
+    + attrs
+    + additions.map((attr) => ' ' + attr.trim()).join('')
+    + variantOpen.close;
+  return markup.slice(0, variantOpen.index) + nextOpen + markup.slice(variantOpen.index + variantOpen.raw.length);
+}
+
+function matchOpeningTag(markup) {
+  const match = String(markup || '').match(/^(\s*<)([A-Za-z][\w:-]*)([^>]*?)(\/?>)/);
+  if (!match) return null;
+  return {
+    raw: match[0],
+    prefix: match[1],
+    tag: match[2],
+    attrs: match[3] || '',
+    close: match[4],
+    index: match.index || 0,
+  };
+}
+
+function parseAttrSegments(attrs) {
+  const out = new Map();
+  const re = /([A-Za-z_:][\w:.-]*)(?:\s*=\s*(?:"[^"]*"|'[^']*'|\{[^}]*\}|[^\s"'>=]+))?/g;
+  let match;
+  while ((match = re.exec(attrs))) {
+    const raw = match[0];
+    const name = match[1];
+    out.set(name, {
+      name,
+      raw,
+      start: match.index,
+      end: match.index + raw.length,
+    });
+  }
+  return out;
+}
+
+function mergeStaticClassAttr(originalClass, variantClass) {
+  const originalValue = originalClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  const variantValue = variantClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  if (!originalValue || !variantValue) return null;
+  const quote = variantValue[1];
+  const classes = [
+    ...variantValue[2].split(/\s+/),
+    ...originalValue[2].split(/\s+/),
+  ].filter(Boolean);
+  return `class=${quote}${[...new Set(classes)].join(' ')}${quote}`;
+}
+
+export function removeSvelteComponentSession(id, cwd = process.cwd()) {
+  const dir = componentSessionDir(id, cwd);
+  try {
+    fs.rmSync(dir, { recursive: true, force: true });
+  } catch { /* non-fatal */ }
+}
+
+export function removeAllSvelteComponentSessions(cwd = process.cwd()) {
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    if (entry.name.startsWith('__')) continue;
+    try {
+      fs.rmSync(path.join(root, entry.name), { recursive: true, force: true });
+    } catch { /* non-fatal */ }
+  }
+}
+
+export function deferredAcceptsPath(cwd = process.cwd()) {
+  const key = createHash('sha1').update(path.resolve(cwd)).digest('hex').slice(0, 16);
+  return path.join(os.tmpdir(), 'impeccable-live', key, 'deferred-svelte-component-accepts.json');
+}
+
+export function readDeferredAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  try {
+    return JSON.parse(fs.readFileSync(file, 'utf-8'));
+  } catch {
+    return { accepts: [] };
+  }
+}
+
+export function writeDeferredAccept(entry, cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  const data = readDeferredAccepts(cwd);
+  data.accepts = (data.accepts || []).filter((item) => item.id !== entry.id);
+  data.accepts.push({ ...entry, createdAt: new Date().toISOString() });
+  fs.writeFileSync(file, JSON.stringify(data, null, 2) + '\n', 'utf-8');
+}
+
+export function applyDeferredSvelteComponentAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  const data = readDeferredAccepts(cwd);
+  const pending = Array.isArray(data.accepts) ? data.accepts : [];
+  const results = [];
+  const remaining = [];
+  for (const entry of pending) {
+    try {
+      const manifest = findSvelteComponentManifest(entry.id, cwd);
+      if (!manifest) {
+        results.push({ id: entry.id, ok: false, error: 'manifest not found' });
+        remaining.push(entry);
+        continue;
+      }
+      const result = inlineSvelteComponentAccept(
+        manifest,
+        entry.variantNum,
+        entry.paramValues || null,
+        cwd,
+      );
+      results.push({ id: entry.id, ok: result.handled !== false, result });
+      if (result.handled === false) remaining.push(entry);
+    } catch (err) {
+      results.push({ id: entry.id, ok: false, error: err.message });
+      remaining.push(entry);
+    }
+  }
+  if (remaining.length > 0) {
+    fs.writeFileSync(file, JSON.stringify({ accepts: remaining }, null, 2) + '\n', 'utf-8');
+  } else {
+    try { fs.rmSync(file, { force: true }); } catch {}
+  }
+  return { applied: results.filter((r) => r.ok).length, failed: results.filter((r) => !r.ok).length, results };
+}
+
+export function buildSvelteComponentCssAuthoring(count) {
+  const variantNumbers = Array.from({ length: count }, (_, i) => i + 1);
+  return {
+    mode: 'svelte-component',
+    styleTag: null,
+    strategy: 'component-style-block',
+    rulePattern: '.semantic-class { ... }',
+    selectorExamples: variantNumbers.map(() => '.expense-row { padding: 22px; }'),
+    requirements: [
+      'Write each variant as a real Svelte component file (v1.svelte, v2.svelte, ...).',
+      'Keep the prop names from propContract; bind dynamic text with {propName}, not literal snapshot text.',
+      'Put variant CSS in the component <style> block using semantic class selectors.',
+      'Author param-driven CSS against var(--p-<id>, default) and [data-p-<id>] using :global(...) so the runtime knob values reach the mounted root.',
+      'Declare params in componentDir/params.json keyed by variant number (e.g. {"1": [...], "2": [...]}), NOT as a data-impeccable-params attribute.',
+      'Do not use @scope or data-impeccable-variant selectors in component files.',
+      'Do not edit the route source file during generation; only edit files under componentDir.',
+    ],
+    forbidden: [
+      'Do not use @scope blocks in Svelte component variants.',
+      'Do not copy live DOM snapshot text into markup when propContract provides bindings.',
+      'Do not add data-impeccable-* attributes inside component files. Svelte parses { in attribute values as an expression, so data-impeccable-params with JSON breaks the build; use componentDir/params.json instead.',
+    ],
+    paramsFile: 'params.json',
+  };
+}

.github/skills/impeccable/scripts/live-sveltekit-adapter.mjs

@@ -0,0 +1,274 @@
+/**
+ * SvelteKit live-mode adapter.
+ *
+ * SvelteKit must not be patched through src/app.html. That file is a document
+ * template, not framework-owned component chrome. The adapter keeps SvelteKit
+ * work limited to mounting a dev-only shadow host from +layout.svelte; the
+ * actual live UI remains the shared plain-DOM browser chrome.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+
+export const SVELTE_LIVE_ROOT_COMPONENT = 'src/lib/impeccable/ImpeccableLiveRoot.svelte';
+export const SVELTE_LAYOUT_MARKER_OPEN = '<!-- impeccable-live-svelte-start -->';
+export const SVELTE_LAYOUT_MARKER_CLOSE = '<!-- impeccable-live-svelte-end -->';
+export const SVELTE_ROOT_IMPORT = "import ImpeccableLiveRoot from '$lib/impeccable/ImpeccableLiveRoot.svelte';";
+
+export function detectSvelteKitProject(cwd = process.cwd(), config = null) {
+  const appHtml = findSvelteKitAppHtml(cwd, config);
+  if (!appHtml) return null;
+  const hasTemplateMarkers = fileIncludes(path.join(cwd, appHtml), '%sveltekit.body%')
+    && fileIncludes(path.join(cwd, appHtml), '%sveltekit.head%');
+  if (!hasTemplateMarkers) return null;
+
+  const hasSvelteConfig = fs.existsSync(path.join(cwd, 'svelte.config.js'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.mjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.cjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.ts'));
+  const hasKitPackage = packageHasSvelteKit(cwd);
+  if (!hasSvelteConfig && !hasKitPackage) return null;
+
+  return {
+    appHtml,
+    layoutFile: findSvelteKitLayout(cwd),
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function applySvelteKitLiveAdapter({ cwd = process.cwd(), port, config = null } = {}) {
+  if (!Number.isFinite(Number(port))) {
+    throw new Error('SvelteKit live adapter requires a numeric port');
+  }
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  ensureSvelteLiveRootComponent(cwd, Number(port));
+
+  const layoutRel = detected.layoutFile;
+  const layoutAbs = path.join(cwd, layoutRel);
+  fs.mkdirSync(path.dirname(layoutAbs), { recursive: true });
+  const layoutExisted = fs.existsSync(layoutAbs);
+  const before = layoutExisted ? fs.readFileSync(layoutAbs, 'utf-8') : defaultSvelteLayout();
+  const after = patchSvelteLayout(before);
+  fs.writeFileSync(layoutAbs, after, 'utf-8');
+
+  return {
+    file: layoutRel,
+    adapter: 'sveltekit',
+    inserted: after !== before || !layoutExisted,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function removeSvelteKitLiveAdapter({ cwd = process.cwd(), config = null } = {}) {
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  const layoutAbs = path.join(cwd, detected.layoutFile);
+  let removed = false;
+  if (fs.existsSync(layoutAbs)) {
+    const before = fs.readFileSync(layoutAbs, 'utf-8');
+    const after = unpatchSvelteLayout(before);
+    if (after !== before) {
+      fs.writeFileSync(layoutAbs, after, 'utf-8');
+      removed = true;
+    }
+  }
+
+  const rootAbs = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  if (fs.existsSync(rootAbs)) {
+    fs.rmSync(rootAbs, { force: true });
+    removed = true;
+  }
+
+  pruneEmptyDir(path.dirname(rootAbs), path.join(cwd, 'src'));
+
+  return {
+    file: detected.layoutFile,
+    adapter: 'sveltekit',
+    removed,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function patchSvelteLayout(content) {
+  let out = String(content || '');
+  if (!out.includes(SVELTE_ROOT_IMPORT)) {
+    const scriptMatch = out.match(/<script(?:\s[^>]*)?>/i);
+    if (scriptMatch) {
+      const insertAt = scriptMatch.index + scriptMatch[0].length;
+      out = out.slice(0, insertAt) + '\n  ' + SVELTE_ROOT_IMPORT + out.slice(insertAt);
+    } else {
+      out = `<script>\n  ${SVELTE_ROOT_IMPORT}\n</script>\n\n` + out;
+    }
+  }
+
+  if (!out.includes(SVELTE_LAYOUT_MARKER_OPEN)) {
+    const block = `${SVELTE_LAYOUT_MARKER_OPEN}\n<ImpeccableLiveRoot />\n${SVELTE_LAYOUT_MARKER_CLOSE}\n`;
+    const renderMatch = out.match(/\{@render\s+children(?:\?\.)?\(\)\s*\}/);
+    const slotMatch = out.match(/<slot\s*\/?>/);
+    const match = renderMatch || slotMatch;
+    if (match) {
+      out = out.slice(0, match.index) + block + out.slice(match.index);
+    } else {
+      out = out.replace(/\s*$/, '\n\n' + block);
+    }
+  }
+
+  return out;
+}
+
+export function unpatchSvelteLayout(content) {
+  let out = String(content || '');
+  const blockRe = new RegExp(
+    '([ \\t]*)' + escapeRegExp(SVELTE_LAYOUT_MARKER_OPEN)
+    + '\\n<ImpeccableLiveRoot\\s*/>\\n'
+    + escapeRegExp(SVELTE_LAYOUT_MARKER_CLOSE)
+    + '\\n?',
+    'g',
+  );
+  out = out.replace(blockRe, '$1');
+  out = out.replace(new RegExp('^\\s*' + escapeRegExp(SVELTE_ROOT_IMPORT) + '\\s*\\n?', 'gm'), '');
+  out = out.replace(/<script>\s*<\/script>\s*\n?/g, '');
+  return out.replace(/\n{3,}/g, '\n\n');
+}
+
+export function ensureSvelteLiveRootComponent(cwd, port) {
+  const file = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, buildSvelteLiveRootComponent(port), 'utf-8');
+  return file;
+}
+
+export function buildSvelteLiveRootComponent(port) {
+  return `<script>
+  import { onMount } from 'svelte';
+
+  const LIVE_URL = 'http://localhost:${Number(port)}/live.js';
+  const HOST_ID = 'impeccable-live-root';
+
+  onMount(() => {
+    let host = document.querySelector('impeccable-live-root#' + HOST_ID) || document.getElementById(HOST_ID);
+    if (!host) {
+      host = document.createElement('impeccable-live-root');
+      host.id = HOST_ID;
+      document.body.appendChild(host);
+    }
+
+    host.dataset.impeccableLiveAdapter = 'sveltekit';
+    host.style.setProperty('all', 'initial', 'important');
+    host.style.setProperty('display', 'block', 'important');
+    host.style.setProperty('position', 'fixed', 'important');
+    host.style.setProperty('top', '0', 'important');
+    host.style.setProperty('left', '0', 'important');
+    host.style.setProperty('width', '0', 'important');
+    host.style.setProperty('height', '0', 'important');
+    host.style.setProperty('overflow', 'visible', 'important');
+    host.style.setProperty('z-index', '2147483000', 'important');
+    host.style.setProperty('pointer-events', 'none', 'important');
+
+    const root = host.shadowRoot || host.attachShadow({ mode: 'open' });
+    if (!root.querySelector('style[data-impeccable-live-reset]')) {
+      const reset = document.createElement('style');
+      reset.dataset.impeccableLiveReset = 'true';
+      reset.textContent = ':host, :host *, * { box-sizing: border-box; }';
+      root.appendChild(reset);
+    }
+
+    window.__IMPECCABLE_LIVE_ADAPTER__ = 'sveltekit';
+    window.__IMPECCABLE_LIVE_UI_ROOT__ = root;
+    window.__IMPECCABLE_LIVE_CHROME_MOUNT__ = {
+      adapter: 'sveltekit',
+      version: 1,
+      host,
+      root,
+    };
+
+    const script = document.createElement('script');
+    script.src = LIVE_URL;
+    script.async = true;
+    script.dataset.impeccableLiveScript = 'true';
+    document.head.appendChild(script);
+
+    return () => {
+      script.remove();
+      if (window.__IMPECCABLE_LIVE_UI_ROOT__ === root) delete window.__IMPECCABLE_LIVE_UI_ROOT__;
+      if (window.__IMPECCABLE_LIVE_CHROME_MOUNT__?.root === root) delete window.__IMPECCABLE_LIVE_CHROME_MOUNT__;
+      if (window.__IMPECCABLE_LIVE_ADAPTER__ === 'sveltekit') delete window.__IMPECCABLE_LIVE_ADAPTER__;
+    };
+  });
+</script>
+`;
+}
+
+function findSvelteKitAppHtml(cwd, config) {
+  const files = Array.isArray(config?.files) ? config.files : ['src/app.html'];
+  for (const rel of files) {
+    if (rel.includes('*')) continue;
+    const normalized = rel.split(path.sep).join('/');
+    if (!normalized.endsWith('app.html')) continue;
+    const abs = path.join(cwd, normalized);
+    if (fs.existsSync(abs)) return normalized;
+  }
+  const fallback = 'src/app.html';
+  return fs.existsSync(path.join(cwd, fallback)) ? fallback : null;
+}
+
+function findSvelteKitLayout(cwd) {
+  const candidates = [
+    'src/routes/+layout.svelte',
+    'src/routes/(app)/+layout.svelte',
+  ];
+  for (const rel of candidates) {
+    if (fs.existsSync(path.join(cwd, rel))) return rel;
+  }
+  return 'src/routes/+layout.svelte';
+}
+
+function defaultSvelteLayout() {
+  return `<script>\n  let { children } = $props();\n</script>\n\n{@render children?.()}\n`;
+}
+
+function packageHasSvelteKit(cwd) {
+  const file = path.join(cwd, 'package.json');
+  if (!fs.existsSync(file)) return false;
+  try {
+    const pkg = JSON.parse(fs.readFileSync(file, 'utf-8'));
+    const deps = {
+      ...(pkg.dependencies || {}),
+      ...(pkg.devDependencies || {}),
+      ...(pkg.peerDependencies || {}),
+    };
+    return Boolean(deps['@sveltejs/kit'] || deps['@sveltejs/vite-plugin-svelte'] || deps.svelte);
+  } catch {
+    return false;
+  }
+}
+
+function fileIncludes(file, text) {
+  try {
+    return fs.readFileSync(file, 'utf-8').includes(text);
+  } catch {
+    return false;
+  }
+}
+
+function pruneEmptyDir(dir, stopDir) {
+  let current = dir;
+  while (current.startsWith(stopDir) && current !== stopDir) {
+    try {
+      if (fs.readdirSync(current).length > 0) return;
+      fs.rmdirSync(current);
+      current = path.dirname(current);
+    } catch {
+      return;
+    }
+  }
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}

.github/skills/impeccable/scripts/live-ui-core.mjs

@@ -0,0 +1,179 @@
+/**
+ * Framework-neutral Impeccable live chrome contract.
+ *
+ * The production browser bundle is intentionally plain DOM so Svelte, React,
+ * Vue, and static adapters can all mount the same chrome. This module is the
+ * testable contract/inventory for that bundle; live-browser.js mirrors these
+ * values at runtime because it is served as a standalone script.
+ */
+
+export const LIVE_CHROME_MOUNT_CONTRACT = Object.freeze([
+  'root',
+  'transport',
+  'state',
+  'actions',
+]);
+
+export const LIVE_UI_SURFACES = Object.freeze([
+  {
+    key: 'global-bottom-bar',
+    ids: [
+      'impeccable-live-global-bar',
+      'impeccable-live-global-bar-brand',
+      'impeccable-live-pick-toggle',
+      'impeccable-live-insert-toggle',
+      'impeccable-live-detect-toggle',
+      'impeccable-live-detect-badge',
+      'impeccable-live-design-toggle',
+      'impeccable-live-page-chat',
+      'impeccable-live-page-chat-input',
+      'impeccable-live-page-chat-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'active', 'tooltip'],
+  },
+  {
+    key: 'pending-copy-edit-dock',
+    ids: ['impeccable-live-pending-dock'],
+    states: ['closed', 'open', 'hover', 'pressed', 'loading', 'rollback', 'keep-fixing'],
+  },
+  {
+    key: 'element-selection-chrome',
+    ids: [
+      'impeccable-live-highlight',
+      'impeccable-live-tooltip',
+      'impeccable-live-bar',
+      'impeccable-live-configure-input-wrap',
+      'impeccable-live-input',
+      'impeccable-live-configure-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'disabled'],
+  },
+  {
+    key: 'action-picker',
+    ids: ['impeccable-live-picker'],
+    states: ['closed', 'open', 'option-hover', 'option-focus'],
+  },
+  {
+    key: 'edit-chrome',
+    ids: ['impeccable-live-edit-badge'],
+    states: ['enabled', 'disabled', 'editing', 'cancel', 'save', 'edited-content'],
+  },
+  {
+    key: 'generating-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-shader'],
+    states: ['action-label', 'animated-dots', 'generating', 'done'],
+  },
+  {
+    key: 'variant-cycling-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-params-panel'],
+    states: ['variant-1', 'variant-2', 'variant-3', 'left-disabled', 'right-disabled', 'dot-click', 'accept', 'discard'],
+  },
+  {
+    key: 'variant-params-panel',
+    ids: ['impeccable-live-params-panel'],
+    states: ['closed', 'open-above', 'open-below', 'range', 'steps', 'toggle'],
+  },
+  {
+    key: 'saving-confirmed-rows',
+    ids: ['impeccable-live-bar'],
+    states: ['saving', 'applying-variant', 'confirmed'],
+  },
+  {
+    key: 'insert-mode-chrome',
+    ids: [
+      'impeccable-live-insert-line',
+      'impeccable-live-insert-placeholder',
+      'impeccable-live-placeholder-resize',
+      'impeccable-live-insert-input',
+      'impeccable-live-insert-voice',
+      'impeccable-live-insert-create',
+      'impeccable-live-insert-create-tooltip',
+    ],
+    states: ['toggle-active', 'line', 'placeholder', 'resize', 'enabled', 'disabled', 'tooltip'],
+  },
+  {
+    key: 'annotation-chrome',
+    ids: [
+      'impeccable-live-annot',
+      'impeccable-live-annot-svg',
+      'impeccable-live-annot-pins',
+      'impeccable-live-annot-clear',
+    ],
+    states: ['overlay', 'drawing', 'pin', 'pin-edit', 'clear'],
+  },
+  {
+    key: 'design-system-panel',
+    ids: ['impeccable-live-design-host'],
+    states: ['closed', 'open', 'tabs', 'token-tiles', 'copy'],
+  },
+  {
+    key: 'toasts-and-errors',
+    ids: ['impeccable-live-toast'],
+    states: ['normal', 'error', 'no-variants-mounted'],
+  },
+  {
+    key: 'css-isolation-boundary',
+    ids: ['impeccable-live-root'],
+    states: ['shadow-root', 'style-tags', 'hostile-css'],
+  },
+]);
+
+export const LIVE_UI_COMPONENT_IDS = Object.freeze([
+  ...new Set(LIVE_UI_SURFACES.flatMap((surface) => surface.ids)),
+]);
+
+export function resolveLiveUiRoot(env = globalThis) {
+  const doc = env?.document;
+  const explicit = env?.__IMPECCABLE_LIVE_UI_ROOT__
+    || env?.window?.__IMPECCABLE_LIVE_UI_ROOT__;
+  if (explicit && typeof explicit.appendChild === 'function') return explicit;
+  return doc?.body || null;
+}
+
+export function getLiveUiElementById(id, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (!id) return null;
+  if (root?.getElementById) {
+    const found = root.getElementById(id);
+    if (found) return found;
+  }
+  if (root?.querySelector) {
+    const found = root.querySelector('#' + escapeCssIdent(id));
+    if (found) return found;
+  }
+  return doc?.getElementById?.(id) || null;
+}
+
+export function appendToLiveUiRoot(el, env = globalThis) {
+  const root = resolveLiveUiRoot(env);
+  if (!root) throw new Error('Impeccable live UI root is not available');
+  root.appendChild(el);
+  return el;
+}
+
+export function appendStyleToLiveUiRoot(styleEl, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (root && root !== doc?.body) {
+    root.appendChild(styleEl);
+  } else {
+    (doc?.head || doc?.body || root).appendChild(styleEl);
+  }
+  return styleEl;
+}
+
+export function activeElementDeep(doc = globalThis.document) {
+  let active = doc?.activeElement || null;
+  while (active?.shadowRoot?.activeElement) {
+    active = active.shadowRoot.activeElement;
+  }
+  return active;
+}
+
+function escapeCssIdent(value) {
+  if (typeof CSS !== 'undefined' && typeof CSS.escape === 'function') {
+    return CSS.escape(String(value));
+  }
+  return String(value).replace(/([ !"#$%&'()*+,./:;<=>?@[\\\]^`{|}~])/g, '\\$1');
+}

.github/skills/impeccable/scripts/live-wrap.mjs

@@ -15,6 +15,11 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -262,6 +267,8 @@ The agent should insert variant HTML at insertLine.`);
     .map((l) => (l.trim() === '' ? '' : indent + extra + l.slice(originalBaseIndent)))
     .join('\n');
   const originalIndented = reindentOriginal('    ');
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+  const useSvelteComponent = shouldUseSvelteComponentInjection(targetFile);
 
   // Wrapper attributes differ by syntax. HTML allows plain string attrs;
   // JSX requires object-literal style and parses string attrs as HTML (which
@@ -302,38 +309,75 @@ The agent should insert variant HTML at insertLine.`);
     indent + commentSyntax.open + ' impeccable-variants-end ' + id + ' ' + commentSyntax.close,
   ];
 
-  // Replace the original element with the wrapper
+  let outputFile = targetFile;
-  const newLines = [
+  let outputLines;
-    ...lines.slice(0, startLine),
+  let outputStartLine = startLine + 1;
-    ...wrapperLines,
+  let outputEndLine = startLine + wrapperLines.length + (originalLines.length - 1);
-    ...lines.slice(endLine + 1),
+  let insertLine;
-  ];
+  let svelteSession = null;
-  fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
 
-  // Calculate insert line (the "insert below this line" comment).
+  if (useSvelteComponent) {
-  // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // Svelte/SvelteKit resets component-local state on markup HMR updates.
-  // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // Keep generation source-neutral: agents write real variant components
-  // original-div + content + close-original-div; JSX: outer-div +
+    // under the generated componentDir, the browser mounts them into the live
-  // start-comment + Original-comment + original-div + content +
+    // DOM, and live-accept.mjs inlines the accepted variant back into the route.
-  // close-original-div). Multi-line originals push the marker by their
+    svelteSession = scaffoldSvelteComponentSession({
-  // extra line count.
+      id,
-  const insertLine = startLine + 6 + (originalLines.length - 1);
+      count,
+      sourceFile: relTargetFile,
+      sourceStartLine: startLine + 1,
+      sourceEndLine: endLine + 1,
+      originalLines,
+      cwd: process.cwd(),
+    });
+    outputFile = path.resolve(process.cwd(), svelteSession.manifestFile);
+    outputStartLine = 1;
+    outputEndLine = 1;
+    insertLine = 1;
+  } else {
+    // Replace the original element with the wrapper
+    const newLines = [
+      ...lines.slice(0, startLine),
+      ...wrapperLines,
+      ...lines.slice(endLine + 1),
+    ];
+    fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
+
+    // Calculate insert line (the "insert below this line" comment).
+    // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // original-div + content + close-original-div; JSX: outer-div +
+    // start-comment + Original-comment + original-div + content +
+    // close-original-div). Multi-line originals push the marker by their
+    // extra line count.
+    insertLine = startLine + 6 + (originalLines.length - 1) + 1;
+  }
+
+  const outputRelFile = path.relative(process.cwd(), outputFile).split(path.sep).join('/');
+
+  const svelteComponentAuthoring = useSvelteComponent ? buildSvelteComponentCssAuthoring(count) : null;
 
   console.log(JSON.stringify({
-    file: path.relative(process.cwd(), targetFile),
+    file: outputRelFile,
-    startLine: startLine + 1,       // 1-indexed for the agent
+    sourceFile: useSvelteComponent ? relTargetFile : undefined,
+    previewMode: useSvelteComponent ? 'svelte-component' : undefined,
+    componentDir: svelteSession?.componentDir,
+    propContract: svelteSession?.propContract,
+    sourceStartLine: useSvelteComponent ? startLine + 1 : undefined,
+    sourceEndLine: useSvelteComponent ? endLine + 1 : undefined,
+    startLine: outputStartLine,       // 1-indexed for the agent
     // wrapperLines is an array but one element (the original-content slot)
     // is a `\n`-joined multi-line string, so the actual file-row count is
     // wrapperLines.length + (originalLines.length - 1). Without the offset,
     // endLine pointed inside the wrapper for any picked element that
     // spanned more than one source line.
-    endLine: startLine + wrapperLines.length + (originalLines.length - 1), // 1-indexed
+    endLine: outputEndLine, // 1-indexed
-    insertLine: insertLine + 1,     // 1-indexed: where variants go
+    insertLine,            // 1-indexed: where variants go
     commentSyntax: commentSyntax,
-    styleMode: styleMode.mode,
+    styleMode: useSvelteComponent ? 'svelte-component' : styleMode.mode,
-    styleTag: styleMode.styleTag,
+    styleTag: useSvelteComponent ? null : styleMode.styleTag,
-    cssSelectorPrefixExamples: buildCssSelectorPrefixExamples(styleMode.mode, count),
+    cssSelectorPrefixExamples: useSvelteComponent ? [] : buildCssSelectorPrefixExamples(styleMode.mode, count),
-    cssAuthoring: buildCssAuthoring(styleMode, count),
+    cssAuthoring: useSvelteComponent ? svelteComponentAuthoring : buildCssAuthoring(styleMode, count),
     originalLineCount: originalLines.length,
   }));
 }
@@ -527,6 +571,14 @@ function splitClassList(classes) {
   return String(classes).split(/[,\s]+/).map(c => c.trim()).filter(Boolean);
 }
 
+function attrEscapeDouble(str) {
+  return String(str)
+    .replace(/&/g, '&')
+    .replace(/"/g, '"')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;');
+}
+
 function detectCommentSyntax(filePath) {
   const ext = path.extname(filePath).toLowerCase();
   if (ext === '.jsx' || ext === '.tsx') {

.gitignore

@@ -40,14 +40,16 @@ Thumbs.db
 # Impeccable-owned project files are split: generated sidecars/config may be
 # tracked, but runtime recovery state and local assets should stay local.
 .impeccable/live/server.json
+.impeccable/hook.cache.json
 .impeccable/live/sessions/
+.impeccable/live/previews/
 .impeccable/live/annotations/
 .impeccable/live/cache/
 .impeccable/live/manual-edit-apply-transaction.json
 .impeccable/live/manual-edit-events.jsonl
 .impeccable/live/manual-edit-evidence/
 .impeccable/live/pending-manual-edits.json
-.impeccable/hook.cache.json
+.impeccable/live/deferred-svelte-component-accepts.json
 .impeccable/history/
 # Per-run critique snapshots are local artifacts. ignore.md (also under
 # this dir) carries deferrals the user may want to share, so it's
@@ -58,6 +60,8 @@ Thumbs.db
 # Legacy live mode session file + annotation screenshots
 .impeccable-live.json
 .impeccable-live/
+src/lib/impeccable/ImpeccableLiveRoot.svelte
+src/lib/impeccable/__runtime.js
 
 # Legacy per-project live mode injection config. New installs use
 # .impeccable/live/config.json in the project root instead.

.kiro/skills/impeccable/reference/live.md

@@ -111,7 +111,9 @@ node .kiro/skills/impeccable/scripts/live-insert.mjs --id EVENT_ID --count EVENT
 
 The scaffold has **no** `data-impeccable-variant="original"`. Variants are net-new HTML+CSS inserted at `insertLine`. Load `brand.md` or `product.md` (freeform only, no action sub-command). Write all variants in one edit, then `--reply done`.
 
-On accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
+For Svelte/SvelteKit targets, `live-insert.mjs` returns `previewMode: "svelte-component"` with `mode: "insert"`, `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each inserted variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`. Insert variants must be non-empty net-new content with a single top-level root, no `data-impeccable-*` attributes, and CSS in each component's `<style>` block. Do **not** edit the route source during generation; the browser mounts the temporary component before/after the live anchor while the user cycles variants. On Accept, `live-accept.mjs` inserts the selected component markup into `sourceFile` immediately and deletes the temp session after the source write succeeds.
+
+For non-Svelte targets, on accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
 
 ### Replace mode (default)
 
@@ -149,6 +151,25 @@ If `--text` matches multiple candidates equally well, wrap exits with `{ error:
 
 Output on success: `{ file, insertLine, commentSyntax, styleMode, styleTag, cssSelectorPrefixExamples, cssAuthoring }`.
 
+For Svelte/SvelteKit targets, `live-wrap.mjs` returns `previewMode: "svelte-component"` with `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`; use the `propContract` prop names for dynamic text (`{propName}`), not literal snapshot strings. Put variant CSS in each component's `<style>` block with semantic class selectors (no `@scope`, no `data-impeccable-*`). Reply with `--file` set to the manifest path; the browser dynamically imports and mounts the compiled components so Svelte HMR does not reset page state while the user cycles variants. On Accept, `live-accept.mjs` inlines the accepted component back into `sourceFile` immediately after source promotion succeeds.
+
+**Params on the Svelte component path go in a sidecar, never as an attribute.** Svelte parses `{` inside an attribute value as the start of an expression, so a `data-impeccable-params='[{…}]'` attribute on a component element fails to compile (`Expected token }`). Declare params for this path in `componentDir/params.json`, keyed by variant number, using the exact param schema from section 7:
+
+```json
+{
+  "1": [
+    {"id":"density","kind":"steps","default":"snug","label":"Density","options":[
+      {"value":"airy","label":"Airy"},{"value":"snug","label":"Snug"},{"value":"packed","label":"Packed"}
+    ]}
+  ],
+  "2": [
+    {"id":"accent","kind":"range","min":0,"max":1,"step":0.05,"default":0.5,"label":"Accent"}
+  ]
+}
+```
+
+Author the component `<style>` against `var(--p-<id>, default)` for `range`/`toggle` and `[data-p-<id>="…"]` for `steps`; wrap those selectors in `:global(...)` so the knob values the runtime sets on the mounted root reach your rules. The browser reads `params.json`, docks the panel, and drives `--p-*` / `data-p-*` on the mounted component exactly as it does for the HTML/JSX path.
+
 `styleMode` controls how preview CSS must be authored. Treat it as a detected capability mode, not a framework guess:
 
 - `scoped`: use `@scope ([data-impeccable-variant="N"])` rules.
@@ -340,7 +361,7 @@ Each variant can expose **coarse** knobs alongside the full HTML/CSS replacement
 
 **Hard cap per variant**: at most **four** parameters so the panel stays legible; rare fifth only if the reference explicitly allows it.
 
-**How to declare.** Put a JSON manifest on the variant wrapper:
+**How to declare.** Put a JSON manifest on the variant wrapper (HTML/JSX path). **On the Svelte `svelte-component` path, do not use this attribute** (Svelte can't compile `{` inside an attribute value). Declare params in `componentDir/params.json` keyed by variant number instead (see the Svelte component paragraph in the wrap section). The param schema below is identical for both paths.
 
 ```html
 <div data-impeccable-variant="1" data-impeccable-params='[
@@ -454,7 +475,7 @@ Do these five steps in the current thread, synchronously, before the next poll.
 1. **Locate the carbonize block** in the source file (`_acceptResult.file`). It's bracketed by `<!-- impeccable-carbonize-start SESSION_ID -->` and `<!-- impeccable-carbonize-end SESSION_ID -->` and contains a `<style data-impeccable-css="SESSION_ID">` element. If the variant declared parameters, an `<!-- impeccable-param-values SESSION_ID: {...} -->` comment sits alongside the style tag with the user's chosen values; read it first; it drives steps 3 and 4 below.
 2. **Move the CSS rules** into the project's real stylesheet. Which stylesheet depends on the project (e.g. `site/styles/workflow.css` for an Astro project, or the component's co-located CSS file for a Vite/Next project; pick whichever already owns styling for the surrounding element).
 3. **Bake in parameter values while rewriting selectors.** For `@scope ([data-impeccable-variant="N"])` wrappers: retarget to real, semantic classes on the accepted HTML (`.why-visual--v2 .v2-label { … }`). For `:scope[data-p-<id>="VALUE"]` selectors: keep only the branch matching the chosen value from the param-values comment; drop the others (they're dead after accept). For `var(--p-<id>, DEFAULT)` in the CSS: either substitute the literal value, or if the param is still useful as a knob going forward, leave the var and update its initial declaration to the chosen value.
-4. **Unwrap the accepted content.** Delete the `<div data-impeccable-variant="N" style="display: contents">` that wraps it. Drop `data-impeccable-params` and any `data-p-*` attributes from it; those are live-mode plumbing, not source.
+4. **Unwrap the accepted content.** Delete the inner `<div data-impeccable-variant="N" style="display: contents">` that wraps it. On JSX/TSX, also delete the outer `<div data-impeccable-carbonize="SESSION_ID" style={{ display: 'contents' }}>` wrapper if present (accept adds it so ternary/`return` slots keep a single root). Drop `data-impeccable-params` and any `data-p-*` attributes; those are live-mode plumbing, not source.
 5. **Delete the inline `<style>` block, the `<!-- impeccable-param-values -->` comment if present, and both `<!-- impeccable-carbonize-start/end -->` markers.** Also drop any `@scope` rules for variants other than the accepted one; those are dead code now.
 
 After the file is clean, run `live-complete.mjs --id SESSION_ID`, verify it reports `phase: "completed"`, then poll again.

.kiro/skills/impeccable/scripts/live-accept.mjs

@@ -17,6 +17,12 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer, writeBuffer as writeManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  findSvelteComponentManifest,
+  inlineSvelteComponentAccept,
+  removeSvelteComponentSession,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -41,6 +47,9 @@ Required:
 
 Options:
   --page-url URL     Current browser page URL; scopes staged copy-edit cleanup
+  --defer-source-write
+                     Deprecated compatibility flag. Svelte component accepts
+                     now write the real source immediately.
 
 Output (JSON):
   { handled, file, carbonize }`);
@@ -64,18 +73,67 @@ Output (JSON):
 
   // Find the file containing this session's markers
   const found = findSessionFile(id, process.cwd());
-  if (!found) {
+  const svelteComponentManifest = found ? null : findSvelteComponentManifest(id, process.cwd());
+
+  if (!found && !svelteComponentManifest) {
     console.log(JSON.stringify({ handled: false, error: 'Session markers not found for id: ' + id }));
     process.exit(0);
   }
 
+  if (svelteComponentManifest) {
+    if (isDiscard) {
+      removeSvelteComponentSession(id, process.cwd());
+      console.log(JSON.stringify({
+        handled: true,
+        file: svelteComponentManifest.sourceFile,
+        carbonize: false,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      }));
+      return;
+    }
+
+    let result;
+    try {
+      result = inlineSvelteComponentAccept(
+        svelteComponentManifest,
+        variantNum,
+        paramValues,
+        process.cwd(),
+      );
+    } catch (err) {
+      result = {
+        handled: false,
+        error: err.message,
+        file: svelteComponentManifest.sourceFile,
+        sourceFile: svelteComponentManifest.sourceFile,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      };
+    }
+    if (result.carbonize) {
+      result.todo = 'REQUIRED before next poll: carbonize cleanup in ' + result.file + '. See reference/live.md "Required after accept".';
+    }
+    console.log(JSON.stringify({ handled: result.handled !== false, ...result }));
+    return;
+  }
+
   const { file: targetFile, content, lines } = found;
   const relFile = path.relative(process.cwd(), targetFile);
+  const previewBlock = findMarkerBlock(id, lines);
+  const sourceShadowPreview = previewBlock
+    ? readSourceShadowPreviewMeta(content, id)
+    : null;
+
+  if (sourceShadowPreview) {
+    console.log(JSON.stringify({
+      handled: false,
+      error: 'source_shadow_preview_deprecated',
+      hint: 'Svelte live mode now uses svelte-component injection. Re-wrap the element and regenerate variants.',
+    }));
+    process.exit(0);
+  }
 
-  // Bail if the session lives in a generated file. The agent manually wrote
-  // the wrapper there for preview, and is responsible for writing the
-  // accepted variant to true source (or cleaning up on discard). See
-  // "Handle fallback" in live.md.
   if (isGeneratedFile(targetFile, { cwd: process.cwd() })) {
     console.log(JSON.stringify({
       handled: false,
@@ -207,6 +265,71 @@ function handleDiscard(id, lines, targetFile) {
 // Accept
 // ---------------------------------------------------------------------------
 
+/**
+ * Build carbonize stitch-in lines. JSX targets occupy a single child slot
+ * (ternary branch, return value, etc.) — the same constraint as live-wrap.
+ * When isJsx, tuck markers + <style> + variant wrapper inside one outer
+ * <div data-impeccable-carbonize> so the slot keeps a single root node.
+ */
+function buildCarbonizeReplacement({
+  indent,
+  commentSyntax,
+  isJsx,
+  id,
+  variantNum,
+  cssContent,
+  paramValues,
+  restored,
+}) {
+  const lines = [];
+  if (!cssContent) {
+    lines.push(...restored);
+    return lines;
+  }
+
+  const variantStyleAttr = isJsx
+    ? "style={{ display: 'contents' }}"
+    : 'style="display: contents"';
+
+  const pushCarbonizeBody = (bodyIndent) => {
+    const bodyRestored = reindentContent(restored, indent, bodyIndent + '  ');
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    for (const cssLine of cssContent) {
+      lines.push(bodyIndent + cssLine.trimStart());
+    }
+    lines.push(bodyIndent + (isJsx ? '`}</style>' : '</style>'));
+    if (paramValues && Object.keys(paramValues).length > 0) {
+      lines.push(
+        bodyIndent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close,
+      );
+    }
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<div data-impeccable-variant="' + variantNum + '" ' + variantStyleAttr + '>');
+    lines.push(...bodyRestored);
+    lines.push(bodyIndent + '</div>');
+  };
+
+  if (isJsx) {
+    const wrapperStyle = 'style={{ display: "contents" }}';
+    lines.push(indent + '<div data-impeccable-carbonize="' + id + '" ' + wrapperStyle + '>');
+    pushCarbonizeBody(indent + '  ');
+    lines.push(indent + '</div>');
+  } else {
+    pushCarbonizeBody(indent);
+  }
+
+  return lines;
+}
+
+function reindentContent(contentLines, fromIndent, toIndent) {
+  return contentLines.map((line) => {
+    if (line.trim() === '') return '';
+    if (line.startsWith(fromIndent)) return toIndent + line.slice(fromIndent.length);
+    return toIndent + line.trimStart();
+  });
+}
+
 function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const block = findMarkerBlock(id, lines);
   if (!block) return { handled: false, error: 'Markers not found' };
@@ -235,45 +358,17 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const hasHelperAttrs = variantText.includes('data-impeccable-variant');
   const needsCarbonize = !!(cssContent || hasHelperAttrs);
 
-  // Build the replacement
   const restored = deindentContent(variantContent, indent);
-  const replacement = [];
+  const replacement = buildCarbonizeReplacement({
-
+    indent,
-  if (cssContent) {
+    commentSyntax,
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    isJsx,
-    // JSX targets need the CSS body wrapped in a template literal so that the
+    id,
-    // `{` and `}` in CSS rules don't get parsed as JSX expressions.
+    variantNum,
-    replacement.push(indent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    cssContent,
-    // Re-indent CSS content to match
+    paramValues,
-    for (const cssLine of cssContent) {
+    restored,
-      replacement.push(indent + cssLine.trimStart());
+  });
-    }
-    replacement.push(indent + (isJsx ? '`}</style>' : '</style>'));
-    if (paramValues && Object.keys(paramValues).length > 0) {
-      // Preserve the user's knob positions for the carbonize-cleanup agent
-      // to bake into the final CSS when it collapses scoped rules.
-      replacement.push(indent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close);
-    }
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
-  }
-
-  // Keep the `@scope ([data-impeccable-variant="N"])` selectors in the
-  // carbonize CSS block working visually by re-wrapping the accepted content
-  // in a data-impeccable-variant="N" div with `display: contents` (so layout
-  // isn't affected). The carbonize agent strips this attribute + wrapper when
-  // it moves the CSS to a proper stylesheet.
-  //
-  // Style attribute syntax has to follow the host file's flavor — JSX files
-  // need the object form, otherwise React 19 throws "Failed to set indexed
-  // property [0] on CSSStyleDeclaration" while parsing the string char-by-char.
-  if (cssContent) {
-    const styleAttr = isJsx ? "style={{ display: 'contents' }}" : 'style="display: contents"';
-    replacement.push(indent + '<div data-impeccable-variant="' + variantNum + '" ' + styleAttr + '>');
-    replacement.push(...restored);
-    replacement.push(indent + '</div>');
-  } else {
-    replacement.push(...restored);
-  }
 
   const newLines = [
     ...lines.slice(0, replaceRange.start),
@@ -285,6 +380,34 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   return { carbonize: needsCarbonize, acceptedOriginalText: originalContent.join('\n') };
 }
 
+function readSourceShadowPreviewMeta(content, id) {
+  const escaped = escapeRegExp(id);
+  const wrapperRe = new RegExp('<[^>]+data-impeccable-variants=(["\'])' + escaped + '\\1[^>]*>');
+  const match = String(content || '').match(wrapperRe);
+  if (!match) return null;
+  const tag = match[0];
+  if (readHtmlAttr(tag, 'data-impeccable-preview') !== 'source-shadow') return null;
+  const sourceFile = readHtmlAttr(tag, 'data-impeccable-source-file');
+  const sourceStartLine = Number(readHtmlAttr(tag, 'data-impeccable-source-start'));
+  const sourceEndLine = Number(readHtmlAttr(tag, 'data-impeccable-source-end'));
+  if (!sourceFile || !Number.isFinite(sourceStartLine) || !Number.isFinite(sourceEndLine)) return null;
+  return { sourceFile, sourceStartLine, sourceEndLine };
+}
+
+function readHtmlAttr(tag, name) {
+  const match = String(tag || '').match(new RegExp('\\s' + escapeRegExp(name) + '\\s*=\\s*(["\'])(.*?)\\1'));
+  if (!match) return null;
+  return decodeHtmlAttr(match[2]);
+}
+
+function decodeHtmlAttr(value) {
+  return String(value || '')
+    .replace(/&quot;/g, '"')
+    .replace(/&lt;/g, '<')
+    .replace(/&gt;/g, '>')
+    .replace(/&amp;/g, '&');
+}
+
 // ---------------------------------------------------------------------------
 // Parsing helpers
 // ---------------------------------------------------------------------------
@@ -686,4 +809,4 @@ if (_running?.endsWith('live-accept.mjs') || _running?.endsWith('live-accept.mjs
   acceptCli();
 }
 
-export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock };
+export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock, applyDeferredSvelteComponentAccepts };

.kiro/skills/impeccable/scripts/live-completion.mjs

@@ -3,6 +3,7 @@ export function completionTypeForAcceptResult(eventType, acceptResult) {
   if (acceptResult?.handled === true && acceptResult?.carbonize === true) return 'agent_done';
   if (acceptResult?.handled === true) return 'complete';
   if (acceptResult?.mode === 'error') return 'error';
+  if (eventType === 'accept' && acceptResult?.previewMode === 'svelte-component') return 'error';
   return 'agent_done';
 }
 

.kiro/skills/impeccable/scripts/live-inject.mjs

@@ -17,11 +17,38 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { resolveLiveConfigPath } from './impeccable-paths.mjs';
+import {
+  applySvelteKitLiveAdapter,
+  detectSvelteKitProject,
+  removeSvelteKitLiveAdapter,
+} from './live-sveltekit-adapter.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const CONFIG_PATH = resolveLiveConfigPath({ cwd: process.cwd(), scriptsDir: __dirname });
 const MARKER_OPEN_TEXT = 'impeccable-live-start';
 const MARKER_CLOSE_TEXT = 'impeccable-live-end';
+const IGNORE_MARKER_OPEN = '# impeccable-live-ignore-start';
+const IGNORE_MARKER_CLOSE = '# impeccable-live-ignore-end';
+
+export const LIVE_IGNORE_PATTERNS = Object.freeze([
+  '.impeccable/hook.cache.json',
+  '.impeccable/live/server.json',
+  '.impeccable/live/sessions/',
+  '.impeccable/live/previews/',
+  '.impeccable/live/annotations/',
+  '.impeccable/live/cache/',
+  '.impeccable/live/manual-edit-apply-transaction.json',
+  '.impeccable/live/manual-edit-events.jsonl',
+  '.impeccable/live/manual-edit-evidence/',
+  '.impeccable/live/pending-manual-edits.json',
+  '.impeccable/live/deferred-svelte-component-accepts.json',
+  '.impeccable-live.json',
+  '.impeccable-live/',
+  'node_modules/.impeccable-live/',
+  'src/lib/impeccable/ImpeccableLiveRoot.svelte',
+  'src/lib/impeccable/__runtime.js',
+  'src/lib/impeccable/[0-9a-f]*/',
+]);
 
 /**
  * Hard-excluded directory patterns. These are NEVER user-facing pages and
@@ -83,8 +110,14 @@ Output (JSON):
   validateConfig(config);
 
   const resolvedFiles = resolveFiles(process.cwd(), config);
+  const svelteKit = detectSvelteKitProject(process.cwd(), config);
 
   if (args.includes('--remove')) {
+    if (svelteKit) {
+      const adapterResult = removeSvelteKitLiveAdapter({ cwd: process.cwd(), config });
+      console.log(JSON.stringify({ ok: true, adapter: 'sveltekit', results: [adapterResult] }));
+      return;
+    }
     const results = resolvedFiles.map((relFile) => {
       const absFile = path.resolve(process.cwd(), relFile);
       if (!fs.existsSync(absFile)) return { file: relFile, error: 'file_not_found' };
@@ -110,6 +143,13 @@ Output (JSON):
     console.error(JSON.stringify({ ok: false, error: 'missing_port' }));
     process.exit(1);
   }
+  const gitIgnore = ensureLiveGitIgnores(process.cwd());
+
+  if (svelteKit) {
+    const adapterResult = applySvelteKitLiveAdapter({ cwd: process.cwd(), port, config });
+    console.log(JSON.stringify({ ok: true, port, adapter: 'sveltekit', gitIgnore, results: [adapterResult] }));
+    return;
+  }
 
   const results = resolvedFiles.map((relFile) => {
     const absFile = path.resolve(process.cwd(), relFile);
@@ -129,10 +169,68 @@ Output (JSON):
     };
   });
   const anyInserted = results.some((r) => r.inserted);
-  console.log(JSON.stringify({ ok: anyInserted, port, results }));
+  console.log(JSON.stringify({ ok: anyInserted, port, gitIgnore, results }));
   if (!anyInserted) process.exit(1);
 }
 
+export function ensureLiveGitIgnores(cwd = process.cwd()) {
+  const target = resolveIgnoreTarget(cwd);
+  const existing = fs.existsSync(target.path) ? fs.readFileSync(target.path, 'utf-8') : '';
+  const block = [
+    IGNORE_MARKER_OPEN,
+    ...LIVE_IGNORE_PATTERNS,
+    IGNORE_MARKER_CLOSE,
+  ].join('\n');
+  const markerRe = new RegExp(`${escapeRegExp(IGNORE_MARKER_OPEN)}[\\s\\S]*?${escapeRegExp(IGNORE_MARKER_CLOSE)}`);
+
+  let updated;
+  if (markerRe.test(existing)) {
+    updated = existing.replace(markerRe, block);
+  } else {
+    const prefix = existing.length === 0 ? '' : existing.endsWith('\n') ? existing : existing + '\n';
+    updated = `${prefix}${prefix.endsWith('\n\n') || prefix === '' ? '' : '\n'}${block}\n`;
+  }
+
+  if (updated !== existing) {
+    fs.mkdirSync(path.dirname(target.path), { recursive: true });
+    fs.writeFileSync(target.path, updated, 'utf-8');
+  }
+
+  return {
+    file: path.relative(cwd, target.path).split(path.sep).join('/'),
+    mode: target.mode,
+    changed: updated !== existing,
+    patterns: [...LIVE_IGNORE_PATTERNS],
+  };
+}
+
+function resolveIgnoreTarget(cwd) {
+  const gitExcludePath = resolveGitInfoExcludePath(cwd);
+  if (gitExcludePath) {
+    return { path: gitExcludePath, mode: 'git-info-exclude' };
+  }
+  return { path: path.join(cwd, '.gitignore'), mode: 'gitignore' };
+}
+
+function resolveGitInfoExcludePath(cwd) {
+  const dotGit = path.join(cwd, '.git');
+  if (!fs.existsSync(dotGit)) return null;
+
+  const stat = fs.statSync(dotGit);
+  if (stat.isDirectory()) return path.join(dotGit, 'info', 'exclude');
+  if (!stat.isFile()) return null;
+
+  const body = fs.readFileSync(dotGit, 'utf-8').trim();
+  const match = body.match(/^gitdir:\s*(.+)$/i);
+  if (!match) return null;
+  const gitDir = path.isAbsolute(match[1]) ? match[1] : path.resolve(cwd, match[1]);
+  return path.join(gitDir, 'info', 'exclude');
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
 /**
  * Expand config.files (which may contain glob patterns) into a literal list
  * of existing file paths relative to rootDir. Literal entries pass through;

.kiro/skills/impeccable/scripts/live-insert.mjs

@@ -21,6 +21,11 @@ import {
   buildCssAuthoring,
   buildCssSelectorPrefixExamples,
 } from './live-wrap.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentInsertSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const INSERT_POSITIONS = new Set(['before', 'after']);
 
@@ -192,6 +197,41 @@ Output (JSON):
   const styleMode = detectStyleMode(targetFile);
   const isJsx = commentSyntax.open === '{/*';
   const spliceIndex = computeInsertLine(startLine, endLine, position);
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+
+  if (shouldUseSvelteComponentInjection(targetFile)) {
+    const session = scaffoldSvelteComponentInsertSession({
+      id,
+      count,
+      sourceFile: relTargetFile,
+      insertLine: spliceIndex + 1,
+      position,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      anchorLines: lines.slice(startLine, endLine + 1),
+      cwd: process.cwd(),
+    });
+    console.log(JSON.stringify({
+      mode: 'insert',
+      position,
+      file: session.manifestFile,
+      sourceFile: relTargetFile,
+      previewMode: 'svelte-component',
+      componentDir: session.componentDir,
+      propContract: session.propContract,
+      insertLine: 1,
+      sourceInsertLine: spliceIndex + 1,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      commentSyntax,
+      styleMode: 'svelte-component',
+      styleTag: null,
+      cssSelectorPrefixExamples: [],
+      cssAuthoring: buildSvelteComponentCssAuthoring(count),
+    }));
+    return;
+  }
+
   const indent = lines[spliceIndex]?.match(/^(\s*)/)?.[1]
     ?? lines[startLine]?.match(/^(\s*)/)?.[1]
     ?? '';
@@ -216,7 +256,7 @@ Output (JSON):
   console.log(JSON.stringify({
     mode: 'insert',
     position,
-    file: path.relative(process.cwd(), targetFile),
+    file: relTargetFile,
     insertLine: insertLine + 1,
     commentSyntax,
     styleMode: styleMode.mode,

.kiro/skills/impeccable/scripts/live-poll.mjs

@@ -20,6 +20,7 @@ import { readLiveServerInfo } from './impeccable-paths.mjs';
 // that ceiling and loop in `pollOnce` to synthesize a long poll without
 // depending on the standalone undici package.
 export const PER_REQUEST_TIMEOUT_MS = 270_000;
+export const DEFAULT_EVENT_LEASE_MS = 600_000;
 
 const EVENT_TYPES_NEEDING_AGENT_REPLY = new Set(['generate', 'steer', 'manual_edit_apply']);
 
@@ -156,7 +157,7 @@ export async function fetchNextEvent(base, token, { totalDeadline } = {}) {
       ? totalDeadline - Date.now()
       : PER_REQUEST_TIMEOUT_MS;
     const slice = Math.min(Math.max(remaining, 1000), PER_REQUEST_TIMEOUT_MS);
-    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}`);
+    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}&leaseMs=${DEFAULT_EVENT_LEASE_MS}`);
 
     if (res.status === 401) {
       const err = new Error('Authentication failed. The server token may have changed.');
@@ -317,7 +318,7 @@ Modes:
 Options:
   --timeout=MS        One-shot poll timeout in ms (default: 600000). Ignored in --stream mode
   --ack-timeout=MS    Stream mode: max wait for --reply after generate/steer (default: 600000)
-  --file PATH         Attach a source file path to the reply (generate flow)
+  --file PATH         Attach a source file path to the reply (generate/steer flow)
   --data JSON         Attach a JSON result object to the reply (manual_edit_apply flow). Must be valid JSON
   --help              Show this help message
 

.kiro/skills/impeccable/scripts/live-server.mjs

@@ -42,6 +42,10 @@ import {
 } from './live-manual-edits-buffer.mjs';
 import { buildManualEditEvidence } from './live-manual-edit-evidence.mjs';
 import { commitManualEdits } from './live-commit-manual-edits.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  removeAllSvelteComponentSessions,
+} from './live-svelte-component.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 // PRODUCT.md / DESIGN.md live wherever context.mjs resolves. The generated
@@ -103,6 +107,7 @@ const MIN_MANUAL_EDIT_APPLY_CHUNK_SIZE = 1;
 const MAX_MANUAL_EDIT_APPLY_CHUNK_SIZE = 20;
 const MANUAL_APPLY_COMPACT_TEXT_LIMIT = 240;
 const MANUAL_APPLY_COMPACT_NEARBY_LIMIT = 4;
+const POLL_LEASE_EXPIRY_TIMER_GRACE_MS = 2;
 const DEBUG_MANUAL_EDIT_EVENTS = /^(1|true|yes)$/i.test(process.env.IMPECCABLE_LIVE_DEBUG_EVENTS || '');
 
 function tombstoneTimedOutApplyId(eventId, details = {}) {
@@ -897,6 +902,8 @@ function leaseEvent(entry, leaseMs) {
     return entry.event;
   }
   entry.leaseUntil = Date.now() + leaseMs;
+  scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return entry.event;
 }
 
@@ -907,9 +914,16 @@ function acknowledgePendingEvent(id) {
   const acknowledged = state.pendingEvents[idx].event;
   state.pendingEvents.splice(idx, 1);
   scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return acknowledged;
 }
 
+function findPendingEventById(id) {
+  if (!id) return null;
+  const entry = state.pendingEvents.find((item) => item.event?.id === id);
+  return entry?.event || null;
+}
+
 function manualApplyReplyCommand(eventOrId = 'EVENT_ID') {
   const id = typeof eventOrId === 'string' ? eventOrId : eventOrId?.id || 'EVENT_ID';
   return `live-poll.mjs --reply ${id} done --data '<json>'`;
@@ -955,6 +969,42 @@ function summarizePendingEventForStatus(entry) {
   return summary;
 }
 
+function summarizeActiveSessionForClient(snapshot = {}) {
+  return {
+    id: snapshot.id,
+    phase: snapshot.phase,
+    pageUrl: snapshot.pageUrl ?? null,
+    sourceFile: snapshot.sourceFile ?? null,
+    previewFile: snapshot.previewFile ?? null,
+    previewMode: snapshot.previewMode ?? null,
+    expectedVariants: snapshot.expectedVariants ?? 0,
+    arrivedVariants: snapshot.arrivedVariants ?? 0,
+    visibleVariant: snapshot.visibleVariant ?? null,
+    checkpointRevision: snapshot.checkpointRevision ?? 0,
+    paramValues: snapshot.paramValues || {},
+  };
+}
+
+function activeSessionSummaries() {
+  if (!state.sessionStore) return [];
+  return state.sessionStore.listActiveSessions().map((snapshot) => summarizeActiveSessionForClient(snapshot));
+}
+
+function cancelQueuedAnonymousExitEvents() {
+  let removed = 0;
+  for (let i = state.pendingEvents.length - 1; i >= 0; i -= 1) {
+    const event = state.pendingEvents[i]?.event;
+    if (event?.type !== 'exit' || event.id) continue;
+    state.pendingEvents.splice(i, 1);
+    removed += 1;
+  }
+  if (removed > 0) {
+    scheduleLeaseFlush();
+    broadcastAgentPollingIfChanged();
+  }
+  return removed;
+}
+
 function cancelPendingManualApplyEvents(pageUrl, reason = 'manual_edit_discarded') {
   const canceledById = new Map();
   const shouldCancel = (event) => event?.type === 'manual_edit_apply' && (!pageUrl || event.pageUrl === pageUrl);
@@ -1001,7 +1051,6 @@ function scheduleLeaseFlush() {
     clearTimeout(state.leaseTimer);
     state.leaseTimer = null;
   }
-  if (state.pendingPolls.length === 0) return;
   const now = Date.now();
   const nextLeaseUntil = state.pendingEvents
     .map((entry) => entry.leaseUntil || 0)
@@ -1011,7 +1060,8 @@ function scheduleLeaseFlush() {
   state.leaseTimer = setTimeout(() => {
     state.leaseTimer = null;
     flushPendingPolls();
-  }, Math.max(0, nextLeaseUntil - now));
+    broadcastAgentPollingIfChanged();
+  }, Math.max(0, nextLeaseUntil - now + POLL_LEASE_EXPIRY_TIMER_GRACE_MS));
 }
 
 function flushPendingPolls() {
@@ -1032,7 +1082,9 @@ function flushPendingPolls() {
 }
 
 function agentPollingConnected() {
-  return state.pendingPolls.length > 0;
+  const now = Date.now();
+  return state.pendingPolls.length > 0
+    || state.pendingEvents.some((entry) => entry.leaseUntil && entry.leaseUntil > now);
 }
 
 function broadcastAgentPollingIfChanged() {
@@ -1318,7 +1370,7 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/status') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401, { 'Content-Type': 'application/json' }); res.end(JSON.stringify({ error: 'Unauthorized' })); return; }
-      const sessions = state.sessionStore ? state.sessionStore.listActiveSessions() : [];
+      const sessions = activeSessionSummaries();
       res.writeHead(200, { 'Content-Type': 'application/json' });
       res.end(JSON.stringify({
         status: 'ok',
@@ -1423,6 +1475,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/events' && req.method === 'GET') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401); res.end('Unauthorized'); return; }
+      clearTimeout(state.exitTimer);
+      state.exitTimer = null;
+      cancelQueuedAnonymousExitEvents();
       res.writeHead(200, {
         'Content-Type': 'text/event-stream',
         'Cache-Control': 'no-cache',
@@ -1432,10 +1487,10 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
         type: 'connected',
         hasProjectContext: hasProjectContext(),
         agentPolling: agentPollingConnected(),
+        activeSessions: activeSessionSummaries(),
       }) + '\n\n');
 
       state.sseClients.add(res);
-      clearTimeout(state.exitTimer);
 
       // Keepalive: SSE comment every 30s prevents silent connection drops.
       const heartbeat = setInterval(() => {
@@ -1827,6 +1882,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
             return;
           }
         }
+        if (msg.type === 'exit') {
+          cleanupSvelteComponentSessionsBeforeExit();
+        }
         if (msg.type !== 'checkpoint') {
           enqueueEvent(msg);
         }
@@ -1905,6 +1963,36 @@ function handlePollGet(req, res, url) {
   });
 }
 
+function sessionFileMetadataFromPollReply(file) {
+  if (!file || typeof file !== 'string') return { file };
+  const normalized = file.split(path.sep).join('/');
+  const base = { file: normalized };
+  if (!normalized.endsWith('/manifest.json') && normalized !== 'manifest.json') return base;
+  if (!normalized.includes('node_modules/.impeccable-live/') && !normalized.includes('src/lib/impeccable/')) return base;
+
+  let full;
+  try {
+    full = path.resolve(process.cwd(), normalized);
+    const rel = path.relative(process.cwd(), full);
+    if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) return base;
+  } catch {
+    return base;
+  }
+
+  try {
+    const manifest = JSON.parse(fs.readFileSync(full, 'utf-8'));
+    if (manifest?.previewMode !== 'svelte-component' || !manifest.sourceFile) return base;
+    return {
+      file: String(manifest.sourceFile).split(path.sep).join('/'),
+      sourceFile: String(manifest.sourceFile).split(path.sep).join('/'),
+      previewFile: normalized,
+      previewMode: 'svelte-component',
+    };
+  } catch {
+    return base;
+  }
+}
+
 function handlePollPost(req, res) {
   let body = '';
   req.on('data', (c) => { body += c; });
@@ -1965,6 +2053,16 @@ function handlePollPost(req, res) {
       res.end(JSON.stringify({ error: 'stale_manual_edit_apply_reply', ...rollback }));
       return;
     }
+    const pendingEventBeforeAck = findPendingEventById(msg.id);
+    if (pendingEventBeforeAck?.type === 'steer' && msg.type === 'steer_done'
+        && !msg.file && !(typeof msg.message === 'string' && msg.message.trim())) {
+      res.writeHead(400, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({
+        error: 'steer_done_requires_file_or_message',
+        hint: 'Reply with --file after writing source, or include a message explaining an intentional no-op.',
+      }));
+      return;
+    }
     const acknowledgedEvent = acknowledgePendingEvent(msg.id);
     let skipJournalReply = false;
     let existingSession = null;
@@ -1987,6 +2085,7 @@ function handlePollPost(req, res) {
       }));
       return;
     }
+    const replyFileMeta = sessionFileMetadataFromPollReply(msg.file);
     if (state.sessionStore && msg.id && !skipJournalReply) {
       try {
         const eventType = msg.type === 'steer_done'
@@ -2001,7 +2100,10 @@ function handlePollPost(req, res) {
         state.sessionStore.appendEvent({
           type: eventType,
           id: msg.id,
-          file: msg.file,
+          file: replyFileMeta.file,
+          sourceFile: replyFileMeta.sourceFile,
+          previewFile: replyFileMeta.previewFile,
+          previewMode: replyFileMeta.previewMode,
           message: msg.message,
           sourceEventType: acknowledgedEvent?.type,
           carbonize: msg.data?.carbonize === true,
@@ -2010,7 +2112,16 @@ function handlePollPost(req, res) {
     }
     flushPendingPolls();
     // Forward the reply to the browser via SSE
-    broadcast({ type: msg.type || 'done', id: msg.id, message: msg.message, file: msg.file, data: msg.data });
+    broadcast({
+      type: msg.type || 'done',
+      id: msg.id,
+      message: msg.message,
+      file: msg.file,
+      sourceFile: replyFileMeta.sourceFile,
+      previewFile: replyFileMeta.previewFile,
+      previewMode: replyFileMeta.previewMode,
+      data: msg.data,
+    });
     res.writeHead(200, { 'Content-Type': 'application/json' });
     res.end(JSON.stringify({ ok: true }));
   });
@@ -2023,6 +2134,7 @@ function handlePollPost(req, res) {
 let httpServer = null;
 
 function shutdown() {
+  cleanupSvelteComponentSessionsBeforeExit();
   removeLiveServerInfo(process.cwd());
   if (state.leaseTimer) clearTimeout(state.leaseTimer);
   state.leaseTimer = null;
@@ -2037,6 +2149,25 @@ function shutdown() {
   process.exit(0);
 }
 
+function cleanupSvelteComponentSessionsBeforeExit() {
+  try {
+    removeAllSvelteComponentSessions(process.cwd());
+  } catch (err) {
+    console.warn('[impeccable] Svelte component session cleanup failed:', err.message);
+  }
+}
+
+function applyLegacyDeferredAcceptsOnStartup() {
+  try {
+    const result = applyDeferredSvelteComponentAccepts(process.cwd());
+    if (result.applied > 0 || result.failed > 0) {
+      console.log('[impeccable] applied legacy deferred Svelte component accepts:', JSON.stringify(result));
+    }
+  } catch (err) {
+    console.warn('[impeccable] legacy deferred Svelte component accept apply failed:', err.message);
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Main
 // ---------------------------------------------------------------------------
@@ -2162,6 +2293,7 @@ rollbackManualApplyTransaction({
   cwd: process.cwd(),
   reason: 'manual_edit_server_start_recovered_abandoned_transaction',
 });
+applyLegacyDeferredAcceptsOnStartup();
 restorePendingEventsFromStore();
 pruneStaleManualApplyEvidence(process.cwd());
 const portArg = args.find(a => a.startsWith('--port='));

.kiro/skills/impeccable/scripts/live-session-store.mjs

@@ -106,6 +106,8 @@ function baseSnapshot(id) {
     phase: 'new',
     pageUrl: null,
     sourceFile: null,
+    previewFile: null,
+    previewMode: null,
     expectedVariants: 0,
     arrivedVariants: 0,
     visibleVariant: null,
@@ -177,8 +179,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
     case 'variants_ready':
     case 'agent_done':
       next.phase = event.carbonize === true ? 'carbonize_required' : 'variants_ready';
-      next.sourceFile = event.file ?? next.sourceFile;
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
-      next.arrivedVariants = event.arrivedVariants ?? (next.arrivedVariants ?? next.expectedVariants);
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.arrivedVariants = event.arrivedVariants ?? (next.expectedVariants || next.arrivedVariants || 0);
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       if (event.carbonize === true) {
@@ -190,12 +194,19 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       }
       break;
     case 'checkpoint':
+      if (COMPLETED_PHASES.has(next.phase)) {
+        next.diagnostics.push({ error: 'checkpoint_after_terminal_ignored', phase: event.phase ?? null, revision: event.revision ?? null });
+        break;
+      }
       if ((event.revision ?? 0) >= (next.checkpointRevision ?? 0)) {
         next.phase = event.phase ?? next.phase;
         next.checkpointRevision = event.revision ?? next.checkpointRevision;
         next.activeOwner = event.owner ?? next.activeOwner;
         next.arrivedVariants = event.arrivedVariants ?? next.arrivedVariants;
         next.visibleVariant = event.visibleVariant ?? next.visibleVariant;
+        next.sourceFile = event.sourceFile ?? next.sourceFile;
+        next.previewFile = event.previewFile ?? next.previewFile;
+        next.previewMode = event.previewMode ?? next.previewMode;
         if (event.paramValues) next.paramValues = { ...event.paramValues };
       } else {
         next.diagnostics.push({ error: 'stale_checkpoint_ignored', revision: event.revision });
@@ -223,6 +234,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'steer_done':
       next.phase = 'steer_done';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.message = event.message ?? next.message;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;
@@ -238,6 +253,9 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'complete':
       next.phase = 'completed';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;

.kiro/skills/impeccable/scripts/live-svelte-component.mjs

@@ -0,0 +1,826 @@
+/**
+ * Svelte live-mode component injection helpers.
+ *
+ * Variants are real .svelte components under node_modules/.impeccable-live/<session-id>/.
+ * The browser mounts them via Svelte 5 mount(); accept inlines the chosen
+ * variant back into the route source with props mapped to original bindings.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+import os from 'node:os';
+import { createHash } from 'node:crypto';
+
+export const SVELTE_COMPONENT_ROOT = 'node_modules/.impeccable-live';
+export const SVELTE_RUNTIME_FILE = `${SVELTE_COMPONENT_ROOT}/__runtime.js`;
+export const DEFERRED_ACCEPTS_FILE = '.impeccable/live/deferred-svelte-component-accepts.json';
+
+const MUSTACHE_RE = /\{([^{}]+)\}/g;
+
+export function shouldUseSvelteComponentInjection(filePath) {
+  if (/^(0|false|no)$/i.test(process.env.IMPECCABLE_LIVE_SVELTE_COMPONENT || '')) return false;
+  return path.extname(filePath).toLowerCase() === '.svelte';
+}
+
+export function componentSessionDir(id, cwd = process.cwd()) {
+  return path.join(cwd, SVELTE_COMPONENT_ROOT, id);
+}
+
+export function manifestPathForSession(id, cwd = process.cwd()) {
+  return path.join(componentSessionDir(id, cwd), 'manifest.json');
+}
+
+export function ensureRuntimeHelper(cwd = process.cwd()) {
+  const file = path.join(cwd, SVELTE_RUNTIME_FILE);
+  if (fs.existsSync(file)) return file;
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, `export { mount, unmount } from 'svelte';\n`, 'utf-8');
+  return file;
+}
+
+/**
+ * Extract ordered unique mustache expressions from markup (not inside <!-- -->).
+ */
+export function extractMustacheExpressions(text) {
+  const expressions = [];
+  const seen = new Set();
+  const lines = String(text || '').split('\n');
+  for (const line of lines) {
+    const trimmed = line.trim();
+    if (trimmed.startsWith('<!--')) continue;
+    let match;
+    MUSTACHE_RE.lastIndex = 0;
+    while ((match = MUSTACHE_RE.exec(line)) !== null) {
+      const expr = match[1].trim();
+      if (!expr || seen.has(expr)) continue;
+      seen.add(expr);
+      expressions.push(expr);
+    }
+  }
+  return expressions;
+}
+
+export function buildPropContract(expressions) {
+  return expressions.map((expr, index) => {
+    const derived = derivePropName(expr, index);
+    return {
+      prop: derived,
+      expr,
+      placeholder: `{${expr}}`,
+    };
+  });
+}
+
+function derivePropName(expr, index) {
+  const tail = expr.match(/(?:\.|\[)(\w+)\s*\]?$/);
+  if (tail && tail[1] && /^[A-Za-z_$][\w$]*$/.test(tail[1])) {
+    return tail[1];
+  }
+  return `prop${index}`;
+}
+
+export function substituteExprsWithProps(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(entry.placeholder).join(`{${entry.prop}}`);
+  }
+  return out;
+}
+
+export function substitutePropsWithExprs(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(`{${entry.prop}}`).join(`{${entry.expr}}`);
+  }
+  return out;
+}
+
+export function parseSvelteComponentFile(content) {
+  const text = String(content || '');
+  const scriptMatch = text.match(/^([\s\S]*?)<script\b[^>]*>[\s\S]*?<\/script>/i);
+  const withoutScript = scriptMatch ? text.slice(scriptMatch[0].length) : text;
+  const styleMatch = withoutScript.match(/<style\b[^>]*>[\s\S]*?<\/style\s*>/i);
+  const styleBlock = styleMatch ? styleMatch[0] : '';
+  const markup = styleMatch
+    ? withoutScript.slice(0, styleMatch.index).trim()
+    : withoutScript.trim();
+  const cssLines = styleBlock
+    ? styleBlock
+      .replace(/^<style\b[^>]*>/i, '')
+      .replace(/<\/style\s*>$/i, '')
+      .split('\n')
+      .map((line) => line.trimEnd())
+    : [];
+  while (cssLines.length > 0 && cssLines[0].trim() === '') cssLines.shift();
+  while (cssLines.length > 0 && cssLines[cssLines.length - 1].trim() === '') cssLines.pop();
+  return { markup, cssLines, styleBlock };
+}
+
+function buildPropsScript(contract) {
+  if (contract.length === 0) {
+    return '<script>\n  /** @type {Record<string, never>} */\n  let {} = $props();\n</script>\n';
+  }
+  const names = contract.map((c) => c.prop).join(', ');
+  const typeFields = contract.map((c) => `    ${c.prop}: string;`).join('\n');
+  return `<script>\n  /** @type {{\n${typeFields}\n  }} */\n  let { ${names} } = $props();\n</script>\n`;
+}
+
+function buildVariantStub(variantNum, originalWithProps, contract) {
+  const propsComment = contract.length > 0
+    ? `\n<!-- Props: ${contract.map((c) => `${c.prop} <- {${c.expr}}`).join(', ')} -->\n`
+    : '';
+  return `${buildPropsScript(contract)}${propsComment}${originalWithProps.trim()}\n\n<style>\n  /* Variant ${variantNum}: add scoped CSS here */\n</style>\n`;
+}
+
+function buildInsertVariantStub(variantNum) {
+  return `${buildPropsScript([])}<div class="impeccable-insert-preview">Insert variant ${variantNum}</div>\n\n<style>\n  .impeccable-insert-preview { display: block; }\n</style>\n`;
+}
+
+export function scaffoldSvelteComponentSession({
+  id,
+  count,
+  sourceFile,
+  sourceStartLine,
+  sourceEndLine,
+  originalLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const originalMarkup = originalLines.join('\n');
+  const contract = buildPropContract(extractMustacheExpressions(originalMarkup));
+  const originalWithProps = substituteExprsWithProps(originalMarkup, contract);
+
+  const manifest = {
+    id,
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    sourceStartLine,
+    sourceEndLine,
+    count,
+    propContract: contract,
+    originalMarkup,
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildVariantStub(n, originalWithProps, contract), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: contract,
+  };
+}
+
+export function scaffoldSvelteComponentInsertSession({
+  id,
+  count,
+  sourceFile,
+  insertLine,
+  position,
+  anchorStartLine,
+  anchorEndLine,
+  anchorLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const anchorMarkup = (anchorLines || []).join('\n');
+  const manifest = {
+    id,
+    mode: 'insert',
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    insertLine,
+    position,
+    anchorStartLine,
+    anchorEndLine,
+    originalMarkup: anchorMarkup,
+    anchorMarkup,
+    count,
+    propContract: [],
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildInsertVariantStub(n), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: [],
+  };
+}
+
+export function findSvelteComponentManifest(id, cwd = process.cwd()) {
+  const direct = manifestPathForSession(id, cwd);
+  if (fs.existsSync(direct)) {
+    return readManifest(direct);
+  }
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return null;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    const candidate = path.join(root, entry.name, 'manifest.json');
+    if (!fs.existsSync(candidate)) continue;
+    try {
+      const manifest = readManifest(candidate);
+      if (manifest?.id === id) return { ...manifest, manifestPath: candidate };
+    } catch { /* skip */ }
+  }
+  return null;
+}
+
+export function readManifest(manifestPath) {
+  const data = JSON.parse(fs.readFileSync(manifestPath, 'utf-8'));
+  return {
+    ...data,
+    manifestPath,
+  };
+}
+
+export function resolveSourceFile(sourceFile, cwd = process.cwd()) {
+  if (!sourceFile || path.isAbsolute(sourceFile)) {
+    throw new Error('Invalid svelte-component source file');
+  }
+  const full = path.resolve(cwd, sourceFile);
+  const rel = path.relative(cwd, full);
+  if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) {
+    throw new Error('Svelte-component source file escapes project root');
+  }
+  if (!fs.existsSync(full)) {
+    throw new Error('Svelte-component source file not found: ' + sourceFile);
+  }
+  return full;
+}
+
+function appendCssToSvelteStyle(lines, cssLines) {
+  const closeIdx = findLastStyleCloseLine(lines);
+  const prepared = ['', ...cssLines.map((line) => (line.trim() === '' ? '' : '  ' + line.trimStart()))];
+  if (closeIdx === -1) {
+    return [...lines, '', '<style>', ...prepared.slice(1), '</style>'];
+  }
+  return [
+    ...lines.slice(0, closeIdx),
+    ...prepared,
+    ...lines.slice(closeIdx),
+  ];
+}
+
+function findLastStyleCloseLine(lines) {
+  for (let i = lines.length - 1; i >= 0; i--) {
+    if (/<\/style\s*>/.test(lines[i])) return i;
+  }
+  return -1;
+}
+
+function bakeParamValuesInCss(cssLines, paramValues) {
+  if (!paramValues || Object.keys(paramValues).length === 0) return cssLines;
+  return cssLines.map((line) => {
+    let out = line;
+    for (const [key, value] of Object.entries(paramValues)) {
+      const varName = `--p-${key}`;
+      out = out.replace(new RegExp(`var\\(${escapeRegExp(varName)}(?:,\\s*[^)]+)?\\)`, 'g'), String(value));
+    }
+    return out;
+  });
+}
+
+function sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues = null, rootTag = 'div') {
+  const css = String((cssLines || []).join('\n'));
+  if (!/data-impeccable-variant|impeccable-variant-ready/.test(css)) return cssLines;
+
+  const rules = parseCssRules(css);
+  const output = [];
+  for (const rule of rules) {
+    appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag);
+  }
+  return output.join('\n')
+    .split('\n')
+    .map((line) => line.trimEnd())
+    .filter((line) => line.trim() !== '');
+}
+
+function appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag) {
+  const prelude = rule.prelude.trim();
+  const body = rule.body.trim();
+  if (!prelude || !body || /--impeccable-variant-ready\s*:/.test(body)) return;
+
+  if (/^@scope\b/i.test(prelude)) {
+    if (/data-impeccable-variant/.test(prelude) && !selectorHasVariant(prelude, variantNum)) return;
+    const inner = parseCssRules(body);
+    for (const innerRule of inner) {
+      const rewrittenPrelude = rewriteAcceptedSvelteSelector(innerRule.prelude, variantNum, paramValues, rootTag, true);
+      if (!rewrittenPrelude || /--impeccable-variant-ready\s*:/.test(innerRule.body)) continue;
+      output.push(formatCssRule(rewrittenPrelude, innerRule.body.trim()));
+    }
+    return;
+  }
+
+  const rewrittenPrelude = rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, false);
+  if (!rewrittenPrelude) return;
+  output.push(formatCssRule(rewrittenPrelude, body));
+}
+
+function parseCssRules(css) {
+  const rules = [];
+  const text = String(css || '');
+  let i = 0;
+  while (i < text.length) {
+    while (i < text.length && /\s/.test(text[i])) i++;
+    const preludeStart = i;
+    while (i < text.length && text[i] !== '{') i++;
+    if (i >= text.length) break;
+    const prelude = text.slice(preludeStart, i).trim();
+    i++;
+    const bodyStart = i;
+    let depth = 1;
+    let quote = null;
+    let comment = false;
+    while (i < text.length && depth > 0) {
+      const ch = text[i];
+      const next = text[i + 1];
+      if (comment) {
+        if (ch === '*' && next === '/') {
+          comment = false;
+          i += 2;
+          continue;
+        }
+        i++;
+        continue;
+      }
+      if (quote) {
+        if (ch === '\\') {
+          i += 2;
+          continue;
+        }
+        if (ch === quote) quote = null;
+        i++;
+        continue;
+      }
+      if (ch === '/' && next === '*') {
+        comment = true;
+        i += 2;
+        continue;
+      }
+      if (ch === '"' || ch === "'") {
+        quote = ch;
+        i++;
+        continue;
+      }
+      if (ch === '{') depth++;
+      else if (ch === '}') depth--;
+      i++;
+    }
+    const body = text.slice(bodyStart, Math.max(bodyStart, i - 1));
+    if (prelude) rules.push({ prelude, body });
+  }
+  return rules;
+}
+
+function rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, fromScope) {
+  const selectors = splitSelectorList(prelude);
+  const rewritten = [];
+  for (const selector of selectors) {
+    const next = rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope);
+    if (next) rewritten.push(next);
+  }
+  return rewritten.join(', ');
+}
+
+function rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope) {
+  let out = selector.trim();
+  const hasVariant = /data-impeccable-variant/.test(out);
+  if (hasVariant && !selectorHasVariant(out, variantNum)) return '';
+  if (hasVariant) {
+    out = out.replace(variantSelectorRegex(variantNum), '');
+    out = out.replace(/\[data-impeccable-variant=(["']).*?\1\]/g, '');
+  }
+
+  const paramResult = rewriteParamSelectors(out, paramValues);
+  if (!paramResult.keep) return '';
+  out = paramResult.selector;
+
+  out = out
+    .replace(/:scope(?:\[[^\]]+\])?\s*>\s*/g, '')
+    .replace(/:scope(?:\[[^\]]+\])?/g, rootTag || '')
+    .replace(/\s+/g, ' ')
+    .trim();
+
+  out = out.replace(/^[>+~]\s*/, '').trim();
+  if (!out && (hasVariant || fromScope)) return rootTag || ':global(*)';
+  return out;
+}
+
+function rewriteParamSelectors(selector, paramValues) {
+  let keep = true;
+  const next = selector.replace(/\[data-p-([A-Za-z0-9_-]+)(?:=(["'])(.*?)\2)?\]/g, (_match, key, _quote, expected) => {
+    if (!paramValues || !Object.prototype.hasOwnProperty.call(paramValues, key)) return '';
+    const actual = paramValues[key];
+    if (expected != null && String(actual) !== String(expected)) {
+      keep = false;
+      return '';
+    }
+    if (expected == null && (actual === false || actual == null || actual === 'false' || actual === 'off' || actual === '0')) {
+      keep = false;
+      return '';
+    }
+    return '';
+  });
+  return { keep, selector: next };
+}
+
+function splitSelectorList(prelude) {
+  const selectors = [];
+  let start = 0;
+  let bracket = 0;
+  let paren = 0;
+  let quote = null;
+  for (let i = 0; i < prelude.length; i++) {
+    const ch = prelude[i];
+    if (quote) {
+      if (ch === '\\') i++;
+      else if (ch === quote) quote = null;
+      continue;
+    }
+    if (ch === '"' || ch === "'") {
+      quote = ch;
+      continue;
+    }
+    if (ch === '[') bracket++;
+    else if (ch === ']') bracket = Math.max(0, bracket - 1);
+    else if (ch === '(') paren++;
+    else if (ch === ')') paren = Math.max(0, paren - 1);
+    else if (ch === ',' && bracket === 0 && paren === 0) {
+      selectors.push(prelude.slice(start, i));
+      start = i + 1;
+    }
+  }
+  selectors.push(prelude.slice(start));
+  return selectors;
+}
+
+function selectorHasVariant(selector, variantNum) {
+  return variantSelectorRegex(variantNum).test(selector);
+}
+
+function variantSelectorRegex(variantNum) {
+  return new RegExp(`\\[data-impeccable-variant=(["'])${escapeRegExp(String(variantNum))}\\1\\]`, 'g');
+}
+
+function formatCssRule(selector, body) {
+  return `${selector} { ${body.trim()} }`;
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+export function inlineSvelteComponentAccept(manifest, variantNum, paramValues = null, cwd = process.cwd()) {
+  const sourceFile = resolveSourceFile(manifest.sourceFile, cwd);
+  const variantPath = path.join(cwd, manifest.componentDir, `v${variantNum}.svelte`);
+  const resultBase = {
+    file: manifest.sourceFile,
+    sourceFile: manifest.sourceFile,
+    previewMode: 'svelte-component',
+    componentDir: manifest.componentDir,
+    carbonize: false,
+  };
+  if (!fs.existsSync(variantPath)) {
+    return { handled: false, error: `Variant ${variantNum} not found`, ...resultBase };
+  }
+
+  const { markup, cssLines } = parseSvelteComponentFile(fs.readFileSync(variantPath, 'utf-8'));
+  if (manifest.mode === 'insert') {
+    return inlineSvelteComponentInsertAccept({
+      manifest,
+      markup,
+      cssLines,
+      variantNum,
+      paramValues,
+      sourceFile,
+      resultBase,
+      cwd,
+    });
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const contract = manifest.propContract || [];
+  const mergedMarkup = mergeOriginalTopLevelAttrs(markup, manifest.originalMarkup || '');
+  const restoredMarkup = substitutePropsWithExprs(mergedMarkup, contract)
+    .split('\n')
+    .map((line) => line.trimEnd());
+
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const start = Number(manifest.sourceStartLine) - 1;
+  const end = Number(manifest.sourceEndLine) - 1;
+  if (!Number.isInteger(start) || !Number.isInteger(end) || start < 0 || end < start || end >= sourceLines.length) {
+    return { handled: false, error: 'Invalid source line range for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const indent = sourceLines[start].match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, start),
+    ...indentedMarkup,
+    ...sourceLines.slice(end + 1),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function inlineSvelteComponentInsertAccept({
+  manifest,
+  markup,
+  cssLines,
+  variantNum,
+  paramValues,
+  sourceFile,
+  resultBase,
+  cwd,
+}) {
+  if (!svelteMarkupHasVisibleContent(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant is empty', ...resultBase };
+  }
+  if (/\bdata-impeccable-[\w-]*\s*=/.test(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant contains preview-only data-impeccable attributes', ...resultBase };
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const restoredMarkup = String(markup || '')
+    .split('\n')
+    .map((line) => line.trimEnd());
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const insertIndex = Number(manifest.insertLine) - 1;
+  if (!Number.isInteger(insertIndex) || insertIndex < 0 || insertIndex > sourceLines.length) {
+    return { handled: false, error: 'Invalid insert line for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const nearbyLine = sourceLines[insertIndex] ?? sourceLines[insertIndex - 1] ?? '';
+  const indent = nearbyLine.match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, insertIndex),
+    ...indentedMarkup,
+    ...sourceLines.slice(insertIndex),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function svelteMarkupHasVisibleContent(markup) {
+  const text = String(markup || '')
+    .replace(/<script[\s\S]*?<\/script>/gi, '')
+    .replace(/<style[\s\S]*?<\/style>/gi, '')
+    .replace(/<!--[\s\S]*?-->/g, '')
+    .replace(/<[^>]+>/g, ' ')
+    .replace(/\s+/g, ' ')
+    .trim();
+  if (text.length > 0) return true;
+  return /<(img|svg|canvas|video|audio|picture|input|button|select|textarea)\b/i.test(markup || '');
+}
+
+function mergeOriginalTopLevelAttrs(markup, originalMarkup) {
+  const variantOpen = matchOpeningTag(markup);
+  const originalOpen = matchOpeningTag(originalMarkup);
+  if (!variantOpen || !originalOpen) return markup;
+  if (variantOpen.tag.toLowerCase() !== originalOpen.tag.toLowerCase()) return markup;
+
+  const variantAttrs = parseAttrSegments(variantOpen.attrs);
+  const originalAttrs = parseAttrSegments(originalOpen.attrs);
+  const additions = [];
+  let attrs = variantOpen.attrs;
+
+  const originalClass = originalAttrs.get('class');
+  const variantClass = variantAttrs.get('class');
+  if (originalClass && variantClass) {
+    const merged = mergeStaticClassAttr(originalClass, variantClass);
+    if (merged) {
+      attrs = attrs.slice(0, variantClass.start) + merged + attrs.slice(variantClass.end);
+      variantAttrs.set('class', { ...variantClass, raw: merged });
+    }
+  } else if (originalClass && !variantClass) {
+    additions.push(originalClass.raw);
+  }
+
+  for (const [name, attr] of originalAttrs) {
+    if (name === 'class') continue;
+    if (!variantAttrs.has(name)) additions.push(attr.raw);
+  }
+
+  if (additions.length === 0 && attrs === variantOpen.attrs) return markup;
+  const nextOpen = variantOpen.prefix
+    + variantOpen.tag
+    + attrs
+    + additions.map((attr) => ' ' + attr.trim()).join('')
+    + variantOpen.close;
+  return markup.slice(0, variantOpen.index) + nextOpen + markup.slice(variantOpen.index + variantOpen.raw.length);
+}
+
+function matchOpeningTag(markup) {
+  const match = String(markup || '').match(/^(\s*<)([A-Za-z][\w:-]*)([^>]*?)(\/?>)/);
+  if (!match) return null;
+  return {
+    raw: match[0],
+    prefix: match[1],
+    tag: match[2],
+    attrs: match[3] || '',
+    close: match[4],
+    index: match.index || 0,
+  };
+}
+
+function parseAttrSegments(attrs) {
+  const out = new Map();
+  const re = /([A-Za-z_:][\w:.-]*)(?:\s*=\s*(?:"[^"]*"|'[^']*'|\{[^}]*\}|[^\s"'>=]+))?/g;
+  let match;
+  while ((match = re.exec(attrs))) {
+    const raw = match[0];
+    const name = match[1];
+    out.set(name, {
+      name,
+      raw,
+      start: match.index,
+      end: match.index + raw.length,
+    });
+  }
+  return out;
+}
+
+function mergeStaticClassAttr(originalClass, variantClass) {
+  const originalValue = originalClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  const variantValue = variantClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  if (!originalValue || !variantValue) return null;
+  const quote = variantValue[1];
+  const classes = [
+    ...variantValue[2].split(/\s+/),
+    ...originalValue[2].split(/\s+/),
+  ].filter(Boolean);
+  return `class=${quote}${[...new Set(classes)].join(' ')}${quote}`;
+}
+
+export function removeSvelteComponentSession(id, cwd = process.cwd()) {
+  const dir = componentSessionDir(id, cwd);
+  try {
+    fs.rmSync(dir, { recursive: true, force: true });
+  } catch { /* non-fatal */ }
+}
+
+export function removeAllSvelteComponentSessions(cwd = process.cwd()) {
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    if (entry.name.startsWith('__')) continue;
+    try {
+      fs.rmSync(path.join(root, entry.name), { recursive: true, force: true });
+    } catch { /* non-fatal */ }
+  }
+}
+
+export function deferredAcceptsPath(cwd = process.cwd()) {
+  const key = createHash('sha1').update(path.resolve(cwd)).digest('hex').slice(0, 16);
+  return path.join(os.tmpdir(), 'impeccable-live', key, 'deferred-svelte-component-accepts.json');
+}
+
+export function readDeferredAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  try {
+    return JSON.parse(fs.readFileSync(file, 'utf-8'));
+  } catch {
+    return { accepts: [] };
+  }
+}
+
+export function writeDeferredAccept(entry, cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  const data = readDeferredAccepts(cwd);
+  data.accepts = (data.accepts || []).filter((item) => item.id !== entry.id);
+  data.accepts.push({ ...entry, createdAt: new Date().toISOString() });
+  fs.writeFileSync(file, JSON.stringify(data, null, 2) + '\n', 'utf-8');
+}
+
+export function applyDeferredSvelteComponentAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  const data = readDeferredAccepts(cwd);
+  const pending = Array.isArray(data.accepts) ? data.accepts : [];
+  const results = [];
+  const remaining = [];
+  for (const entry of pending) {
+    try {
+      const manifest = findSvelteComponentManifest(entry.id, cwd);
+      if (!manifest) {
+        results.push({ id: entry.id, ok: false, error: 'manifest not found' });
+        remaining.push(entry);
+        continue;
+      }
+      const result = inlineSvelteComponentAccept(
+        manifest,
+        entry.variantNum,
+        entry.paramValues || null,
+        cwd,
+      );
+      results.push({ id: entry.id, ok: result.handled !== false, result });
+      if (result.handled === false) remaining.push(entry);
+    } catch (err) {
+      results.push({ id: entry.id, ok: false, error: err.message });
+      remaining.push(entry);
+    }
+  }
+  if (remaining.length > 0) {
+    fs.writeFileSync(file, JSON.stringify({ accepts: remaining }, null, 2) + '\n', 'utf-8');
+  } else {
+    try { fs.rmSync(file, { force: true }); } catch {}
+  }
+  return { applied: results.filter((r) => r.ok).length, failed: results.filter((r) => !r.ok).length, results };
+}
+
+export function buildSvelteComponentCssAuthoring(count) {
+  const variantNumbers = Array.from({ length: count }, (_, i) => i + 1);
+  return {
+    mode: 'svelte-component',
+    styleTag: null,
+    strategy: 'component-style-block',
+    rulePattern: '.semantic-class { ... }',
+    selectorExamples: variantNumbers.map(() => '.expense-row { padding: 22px; }'),
+    requirements: [
+      'Write each variant as a real Svelte component file (v1.svelte, v2.svelte, ...).',
+      'Keep the prop names from propContract; bind dynamic text with {propName}, not literal snapshot text.',
+      'Put variant CSS in the component <style> block using semantic class selectors.',
+      'Author param-driven CSS against var(--p-<id>, default) and [data-p-<id>] using :global(...) so the runtime knob values reach the mounted root.',
+      'Declare params in componentDir/params.json keyed by variant number (e.g. {"1": [...], "2": [...]}), NOT as a data-impeccable-params attribute.',
+      'Do not use @scope or data-impeccable-variant selectors in component files.',
+      'Do not edit the route source file during generation; only edit files under componentDir.',
+    ],
+    forbidden: [
+      'Do not use @scope blocks in Svelte component variants.',
+      'Do not copy live DOM snapshot text into markup when propContract provides bindings.',
+      'Do not add data-impeccable-* attributes inside component files. Svelte parses { in attribute values as an expression, so data-impeccable-params with JSON breaks the build; use componentDir/params.json instead.',
+    ],
+    paramsFile: 'params.json',
+  };
+}

.kiro/skills/impeccable/scripts/live-sveltekit-adapter.mjs

@@ -0,0 +1,274 @@
+/**
+ * SvelteKit live-mode adapter.
+ *
+ * SvelteKit must not be patched through src/app.html. That file is a document
+ * template, not framework-owned component chrome. The adapter keeps SvelteKit
+ * work limited to mounting a dev-only shadow host from +layout.svelte; the
+ * actual live UI remains the shared plain-DOM browser chrome.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+
+export const SVELTE_LIVE_ROOT_COMPONENT = 'src/lib/impeccable/ImpeccableLiveRoot.svelte';
+export const SVELTE_LAYOUT_MARKER_OPEN = '<!-- impeccable-live-svelte-start -->';
+export const SVELTE_LAYOUT_MARKER_CLOSE = '<!-- impeccable-live-svelte-end -->';
+export const SVELTE_ROOT_IMPORT = "import ImpeccableLiveRoot from '$lib/impeccable/ImpeccableLiveRoot.svelte';";
+
+export function detectSvelteKitProject(cwd = process.cwd(), config = null) {
+  const appHtml = findSvelteKitAppHtml(cwd, config);
+  if (!appHtml) return null;
+  const hasTemplateMarkers = fileIncludes(path.join(cwd, appHtml), '%sveltekit.body%')
+    && fileIncludes(path.join(cwd, appHtml), '%sveltekit.head%');
+  if (!hasTemplateMarkers) return null;
+
+  const hasSvelteConfig = fs.existsSync(path.join(cwd, 'svelte.config.js'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.mjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.cjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.ts'));
+  const hasKitPackage = packageHasSvelteKit(cwd);
+  if (!hasSvelteConfig && !hasKitPackage) return null;
+
+  return {
+    appHtml,
+    layoutFile: findSvelteKitLayout(cwd),
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function applySvelteKitLiveAdapter({ cwd = process.cwd(), port, config = null } = {}) {
+  if (!Number.isFinite(Number(port))) {
+    throw new Error('SvelteKit live adapter requires a numeric port');
+  }
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  ensureSvelteLiveRootComponent(cwd, Number(port));
+
+  const layoutRel = detected.layoutFile;
+  const layoutAbs = path.join(cwd, layoutRel);
+  fs.mkdirSync(path.dirname(layoutAbs), { recursive: true });
+  const layoutExisted = fs.existsSync(layoutAbs);
+  const before = layoutExisted ? fs.readFileSync(layoutAbs, 'utf-8') : defaultSvelteLayout();
+  const after = patchSvelteLayout(before);
+  fs.writeFileSync(layoutAbs, after, 'utf-8');
+
+  return {
+    file: layoutRel,
+    adapter: 'sveltekit',
+    inserted: after !== before || !layoutExisted,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function removeSvelteKitLiveAdapter({ cwd = process.cwd(), config = null } = {}) {
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  const layoutAbs = path.join(cwd, detected.layoutFile);
+  let removed = false;
+  if (fs.existsSync(layoutAbs)) {
+    const before = fs.readFileSync(layoutAbs, 'utf-8');
+    const after = unpatchSvelteLayout(before);
+    if (after !== before) {
+      fs.writeFileSync(layoutAbs, after, 'utf-8');
+      removed = true;
+    }
+  }
+
+  const rootAbs = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  if (fs.existsSync(rootAbs)) {
+    fs.rmSync(rootAbs, { force: true });
+    removed = true;
+  }
+
+  pruneEmptyDir(path.dirname(rootAbs), path.join(cwd, 'src'));
+
+  return {
+    file: detected.layoutFile,
+    adapter: 'sveltekit',
+    removed,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function patchSvelteLayout(content) {
+  let out = String(content || '');
+  if (!out.includes(SVELTE_ROOT_IMPORT)) {
+    const scriptMatch = out.match(/<script(?:\s[^>]*)?>/i);
+    if (scriptMatch) {
+      const insertAt = scriptMatch.index + scriptMatch[0].length;
+      out = out.slice(0, insertAt) + '\n  ' + SVELTE_ROOT_IMPORT + out.slice(insertAt);
+    } else {
+      out = `<script>\n  ${SVELTE_ROOT_IMPORT}\n</script>\n\n` + out;
+    }
+  }
+
+  if (!out.includes(SVELTE_LAYOUT_MARKER_OPEN)) {
+    const block = `${SVELTE_LAYOUT_MARKER_OPEN}\n<ImpeccableLiveRoot />\n${SVELTE_LAYOUT_MARKER_CLOSE}\n`;
+    const renderMatch = out.match(/\{@render\s+children(?:\?\.)?\(\)\s*\}/);
+    const slotMatch = out.match(/<slot\s*\/?>/);
+    const match = renderMatch || slotMatch;
+    if (match) {
+      out = out.slice(0, match.index) + block + out.slice(match.index);
+    } else {
+      out = out.replace(/\s*$/, '\n\n' + block);
+    }
+  }
+
+  return out;
+}
+
+export function unpatchSvelteLayout(content) {
+  let out = String(content || '');
+  const blockRe = new RegExp(
+    '([ \\t]*)' + escapeRegExp(SVELTE_LAYOUT_MARKER_OPEN)
+    + '\\n<ImpeccableLiveRoot\\s*/>\\n'
+    + escapeRegExp(SVELTE_LAYOUT_MARKER_CLOSE)
+    + '\\n?',
+    'g',
+  );
+  out = out.replace(blockRe, '$1');
+  out = out.replace(new RegExp('^\\s*' + escapeRegExp(SVELTE_ROOT_IMPORT) + '\\s*\\n?', 'gm'), '');
+  out = out.replace(/<script>\s*<\/script>\s*\n?/g, '');
+  return out.replace(/\n{3,}/g, '\n\n');
+}
+
+export function ensureSvelteLiveRootComponent(cwd, port) {
+  const file = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, buildSvelteLiveRootComponent(port), 'utf-8');
+  return file;
+}
+
+export function buildSvelteLiveRootComponent(port) {
+  return `<script>
+  import { onMount } from 'svelte';
+
+  const LIVE_URL = 'http://localhost:${Number(port)}/live.js';
+  const HOST_ID = 'impeccable-live-root';
+
+  onMount(() => {
+    let host = document.querySelector('impeccable-live-root#' + HOST_ID) || document.getElementById(HOST_ID);
+    if (!host) {
+      host = document.createElement('impeccable-live-root');
+      host.id = HOST_ID;
+      document.body.appendChild(host);
+    }
+
+    host.dataset.impeccableLiveAdapter = 'sveltekit';
+    host.style.setProperty('all', 'initial', 'important');
+    host.style.setProperty('display', 'block', 'important');
+    host.style.setProperty('position', 'fixed', 'important');
+    host.style.setProperty('top', '0', 'important');
+    host.style.setProperty('left', '0', 'important');
+    host.style.setProperty('width', '0', 'important');
+    host.style.setProperty('height', '0', 'important');
+    host.style.setProperty('overflow', 'visible', 'important');
+    host.style.setProperty('z-index', '2147483000', 'important');
+    host.style.setProperty('pointer-events', 'none', 'important');
+
+    const root = host.shadowRoot || host.attachShadow({ mode: 'open' });
+    if (!root.querySelector('style[data-impeccable-live-reset]')) {
+      const reset = document.createElement('style');
+      reset.dataset.impeccableLiveReset = 'true';
+      reset.textContent = ':host, :host *, * { box-sizing: border-box; }';
+      root.appendChild(reset);
+    }
+
+    window.__IMPECCABLE_LIVE_ADAPTER__ = 'sveltekit';
+    window.__IMPECCABLE_LIVE_UI_ROOT__ = root;
+    window.__IMPECCABLE_LIVE_CHROME_MOUNT__ = {
+      adapter: 'sveltekit',
+      version: 1,
+      host,
+      root,
+    };
+
+    const script = document.createElement('script');
+    script.src = LIVE_URL;
+    script.async = true;
+    script.dataset.impeccableLiveScript = 'true';
+    document.head.appendChild(script);
+
+    return () => {
+      script.remove();
+      if (window.__IMPECCABLE_LIVE_UI_ROOT__ === root) delete window.__IMPECCABLE_LIVE_UI_ROOT__;
+      if (window.__IMPECCABLE_LIVE_CHROME_MOUNT__?.root === root) delete window.__IMPECCABLE_LIVE_CHROME_MOUNT__;
+      if (window.__IMPECCABLE_LIVE_ADAPTER__ === 'sveltekit') delete window.__IMPECCABLE_LIVE_ADAPTER__;
+    };
+  });
+</script>
+`;
+}
+
+function findSvelteKitAppHtml(cwd, config) {
+  const files = Array.isArray(config?.files) ? config.files : ['src/app.html'];
+  for (const rel of files) {
+    if (rel.includes('*')) continue;
+    const normalized = rel.split(path.sep).join('/');
+    if (!normalized.endsWith('app.html')) continue;
+    const abs = path.join(cwd, normalized);
+    if (fs.existsSync(abs)) return normalized;
+  }
+  const fallback = 'src/app.html';
+  return fs.existsSync(path.join(cwd, fallback)) ? fallback : null;
+}
+
+function findSvelteKitLayout(cwd) {
+  const candidates = [
+    'src/routes/+layout.svelte',
+    'src/routes/(app)/+layout.svelte',
+  ];
+  for (const rel of candidates) {
+    if (fs.existsSync(path.join(cwd, rel))) return rel;
+  }
+  return 'src/routes/+layout.svelte';
+}
+
+function defaultSvelteLayout() {
+  return `<script>\n  let { children } = $props();\n</script>\n\n{@render children?.()}\n`;
+}
+
+function packageHasSvelteKit(cwd) {
+  const file = path.join(cwd, 'package.json');
+  if (!fs.existsSync(file)) return false;
+  try {
+    const pkg = JSON.parse(fs.readFileSync(file, 'utf-8'));
+    const deps = {
+      ...(pkg.dependencies || {}),
+      ...(pkg.devDependencies || {}),
+      ...(pkg.peerDependencies || {}),
+    };
+    return Boolean(deps['@sveltejs/kit'] || deps['@sveltejs/vite-plugin-svelte'] || deps.svelte);
+  } catch {
+    return false;
+  }
+}
+
+function fileIncludes(file, text) {
+  try {
+    return fs.readFileSync(file, 'utf-8').includes(text);
+  } catch {
+    return false;
+  }
+}
+
+function pruneEmptyDir(dir, stopDir) {
+  let current = dir;
+  while (current.startsWith(stopDir) && current !== stopDir) {
+    try {
+      if (fs.readdirSync(current).length > 0) return;
+      fs.rmdirSync(current);
+      current = path.dirname(current);
+    } catch {
+      return;
+    }
+  }
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}

.kiro/skills/impeccable/scripts/live-ui-core.mjs

@@ -0,0 +1,179 @@
+/**
+ * Framework-neutral Impeccable live chrome contract.
+ *
+ * The production browser bundle is intentionally plain DOM so Svelte, React,
+ * Vue, and static adapters can all mount the same chrome. This module is the
+ * testable contract/inventory for that bundle; live-browser.js mirrors these
+ * values at runtime because it is served as a standalone script.
+ */
+
+export const LIVE_CHROME_MOUNT_CONTRACT = Object.freeze([
+  'root',
+  'transport',
+  'state',
+  'actions',
+]);
+
+export const LIVE_UI_SURFACES = Object.freeze([
+  {
+    key: 'global-bottom-bar',
+    ids: [
+      'impeccable-live-global-bar',
+      'impeccable-live-global-bar-brand',
+      'impeccable-live-pick-toggle',
+      'impeccable-live-insert-toggle',
+      'impeccable-live-detect-toggle',
+      'impeccable-live-detect-badge',
+      'impeccable-live-design-toggle',
+      'impeccable-live-page-chat',
+      'impeccable-live-page-chat-input',
+      'impeccable-live-page-chat-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'active', 'tooltip'],
+  },
+  {
+    key: 'pending-copy-edit-dock',
+    ids: ['impeccable-live-pending-dock'],
+    states: ['closed', 'open', 'hover', 'pressed', 'loading', 'rollback', 'keep-fixing'],
+  },
+  {
+    key: 'element-selection-chrome',
+    ids: [
+      'impeccable-live-highlight',
+      'impeccable-live-tooltip',
+      'impeccable-live-bar',
+      'impeccable-live-configure-input-wrap',
+      'impeccable-live-input',
+      'impeccable-live-configure-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'disabled'],
+  },
+  {
+    key: 'action-picker',
+    ids: ['impeccable-live-picker'],
+    states: ['closed', 'open', 'option-hover', 'option-focus'],
+  },
+  {
+    key: 'edit-chrome',
+    ids: ['impeccable-live-edit-badge'],
+    states: ['enabled', 'disabled', 'editing', 'cancel', 'save', 'edited-content'],
+  },
+  {
+    key: 'generating-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-shader'],
+    states: ['action-label', 'animated-dots', 'generating', 'done'],
+  },
+  {
+    key: 'variant-cycling-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-params-panel'],
+    states: ['variant-1', 'variant-2', 'variant-3', 'left-disabled', 'right-disabled', 'dot-click', 'accept', 'discard'],
+  },
+  {
+    key: 'variant-params-panel',
+    ids: ['impeccable-live-params-panel'],
+    states: ['closed', 'open-above', 'open-below', 'range', 'steps', 'toggle'],
+  },
+  {
+    key: 'saving-confirmed-rows',
+    ids: ['impeccable-live-bar'],
+    states: ['saving', 'applying-variant', 'confirmed'],
+  },
+  {
+    key: 'insert-mode-chrome',
+    ids: [
+      'impeccable-live-insert-line',
+      'impeccable-live-insert-placeholder',
+      'impeccable-live-placeholder-resize',
+      'impeccable-live-insert-input',
+      'impeccable-live-insert-voice',
+      'impeccable-live-insert-create',
+      'impeccable-live-insert-create-tooltip',
+    ],
+    states: ['toggle-active', 'line', 'placeholder', 'resize', 'enabled', 'disabled', 'tooltip'],
+  },
+  {
+    key: 'annotation-chrome',
+    ids: [
+      'impeccable-live-annot',
+      'impeccable-live-annot-svg',
+      'impeccable-live-annot-pins',
+      'impeccable-live-annot-clear',
+    ],
+    states: ['overlay', 'drawing', 'pin', 'pin-edit', 'clear'],
+  },
+  {
+    key: 'design-system-panel',
+    ids: ['impeccable-live-design-host'],
+    states: ['closed', 'open', 'tabs', 'token-tiles', 'copy'],
+  },
+  {
+    key: 'toasts-and-errors',
+    ids: ['impeccable-live-toast'],
+    states: ['normal', 'error', 'no-variants-mounted'],
+  },
+  {
+    key: 'css-isolation-boundary',
+    ids: ['impeccable-live-root'],
+    states: ['shadow-root', 'style-tags', 'hostile-css'],
+  },
+]);
+
+export const LIVE_UI_COMPONENT_IDS = Object.freeze([
+  ...new Set(LIVE_UI_SURFACES.flatMap((surface) => surface.ids)),
+]);
+
+export function resolveLiveUiRoot(env = globalThis) {
+  const doc = env?.document;
+  const explicit = env?.__IMPECCABLE_LIVE_UI_ROOT__
+    || env?.window?.__IMPECCABLE_LIVE_UI_ROOT__;
+  if (explicit && typeof explicit.appendChild === 'function') return explicit;
+  return doc?.body || null;
+}
+
+export function getLiveUiElementById(id, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (!id) return null;
+  if (root?.getElementById) {
+    const found = root.getElementById(id);
+    if (found) return found;
+  }
+  if (root?.querySelector) {
+    const found = root.querySelector('#' + escapeCssIdent(id));
+    if (found) return found;
+  }
+  return doc?.getElementById?.(id) || null;
+}
+
+export function appendToLiveUiRoot(el, env = globalThis) {
+  const root = resolveLiveUiRoot(env);
+  if (!root) throw new Error('Impeccable live UI root is not available');
+  root.appendChild(el);
+  return el;
+}
+
+export function appendStyleToLiveUiRoot(styleEl, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (root && root !== doc?.body) {
+    root.appendChild(styleEl);
+  } else {
+    (doc?.head || doc?.body || root).appendChild(styleEl);
+  }
+  return styleEl;
+}
+
+export function activeElementDeep(doc = globalThis.document) {
+  let active = doc?.activeElement || null;
+  while (active?.shadowRoot?.activeElement) {
+    active = active.shadowRoot.activeElement;
+  }
+  return active;
+}
+
+function escapeCssIdent(value) {
+  if (typeof CSS !== 'undefined' && typeof CSS.escape === 'function') {
+    return CSS.escape(String(value));
+  }
+  return String(value).replace(/([ !"#$%&'()*+,./:;<=>?@[\\\]^`{|}~])/g, '\\$1');
+}

.kiro/skills/impeccable/scripts/live-wrap.mjs

@@ -15,6 +15,11 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -262,6 +267,8 @@ The agent should insert variant HTML at insertLine.`);
     .map((l) => (l.trim() === '' ? '' : indent + extra + l.slice(originalBaseIndent)))
     .join('\n');
   const originalIndented = reindentOriginal('    ');
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+  const useSvelteComponent = shouldUseSvelteComponentInjection(targetFile);
 
   // Wrapper attributes differ by syntax. HTML allows plain string attrs;
   // JSX requires object-literal style and parses string attrs as HTML (which
@@ -302,38 +309,75 @@ The agent should insert variant HTML at insertLine.`);
     indent + commentSyntax.open + ' impeccable-variants-end ' + id + ' ' + commentSyntax.close,
   ];
 
-  // Replace the original element with the wrapper
+  let outputFile = targetFile;
-  const newLines = [
+  let outputLines;
-    ...lines.slice(0, startLine),
+  let outputStartLine = startLine + 1;
-    ...wrapperLines,
+  let outputEndLine = startLine + wrapperLines.length + (originalLines.length - 1);
-    ...lines.slice(endLine + 1),
+  let insertLine;
-  ];
+  let svelteSession = null;
-  fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
 
-  // Calculate insert line (the "insert below this line" comment).
+  if (useSvelteComponent) {
-  // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // Svelte/SvelteKit resets component-local state on markup HMR updates.
-  // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // Keep generation source-neutral: agents write real variant components
-  // original-div + content + close-original-div; JSX: outer-div +
+    // under the generated componentDir, the browser mounts them into the live
-  // start-comment + Original-comment + original-div + content +
+    // DOM, and live-accept.mjs inlines the accepted variant back into the route.
-  // close-original-div). Multi-line originals push the marker by their
+    svelteSession = scaffoldSvelteComponentSession({
-  // extra line count.
+      id,
-  const insertLine = startLine + 6 + (originalLines.length - 1);
+      count,
+      sourceFile: relTargetFile,
+      sourceStartLine: startLine + 1,
+      sourceEndLine: endLine + 1,
+      originalLines,
+      cwd: process.cwd(),
+    });
+    outputFile = path.resolve(process.cwd(), svelteSession.manifestFile);
+    outputStartLine = 1;
+    outputEndLine = 1;
+    insertLine = 1;
+  } else {
+    // Replace the original element with the wrapper
+    const newLines = [
+      ...lines.slice(0, startLine),
+      ...wrapperLines,
+      ...lines.slice(endLine + 1),
+    ];
+    fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
+
+    // Calculate insert line (the "insert below this line" comment).
+    // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // original-div + content + close-original-div; JSX: outer-div +
+    // start-comment + Original-comment + original-div + content +
+    // close-original-div). Multi-line originals push the marker by their
+    // extra line count.
+    insertLine = startLine + 6 + (originalLines.length - 1) + 1;
+  }
+
+  const outputRelFile = path.relative(process.cwd(), outputFile).split(path.sep).join('/');
+
+  const svelteComponentAuthoring = useSvelteComponent ? buildSvelteComponentCssAuthoring(count) : null;
 
   console.log(JSON.stringify({
-    file: path.relative(process.cwd(), targetFile),
+    file: outputRelFile,
-    startLine: startLine + 1,       // 1-indexed for the agent
+    sourceFile: useSvelteComponent ? relTargetFile : undefined,
+    previewMode: useSvelteComponent ? 'svelte-component' : undefined,
+    componentDir: svelteSession?.componentDir,
+    propContract: svelteSession?.propContract,
+    sourceStartLine: useSvelteComponent ? startLine + 1 : undefined,
+    sourceEndLine: useSvelteComponent ? endLine + 1 : undefined,
+    startLine: outputStartLine,       // 1-indexed for the agent
     // wrapperLines is an array but one element (the original-content slot)
     // is a `\n`-joined multi-line string, so the actual file-row count is
     // wrapperLines.length + (originalLines.length - 1). Without the offset,
     // endLine pointed inside the wrapper for any picked element that
     // spanned more than one source line.
-    endLine: startLine + wrapperLines.length + (originalLines.length - 1), // 1-indexed
+    endLine: outputEndLine, // 1-indexed
-    insertLine: insertLine + 1,     // 1-indexed: where variants go
+    insertLine,            // 1-indexed: where variants go
     commentSyntax: commentSyntax,
-    styleMode: styleMode.mode,
+    styleMode: useSvelteComponent ? 'svelte-component' : styleMode.mode,
-    styleTag: styleMode.styleTag,
+    styleTag: useSvelteComponent ? null : styleMode.styleTag,
-    cssSelectorPrefixExamples: buildCssSelectorPrefixExamples(styleMode.mode, count),
+    cssSelectorPrefixExamples: useSvelteComponent ? [] : buildCssSelectorPrefixExamples(styleMode.mode, count),
-    cssAuthoring: buildCssAuthoring(styleMode, count),
+    cssAuthoring: useSvelteComponent ? svelteComponentAuthoring : buildCssAuthoring(styleMode, count),
     originalLineCount: originalLines.length,
   }));
 }
@@ -527,6 +571,14 @@ function splitClassList(classes) {
   return String(classes).split(/[,\s]+/).map(c => c.trim()).filter(Boolean);
 }
 
+function attrEscapeDouble(str) {
+  return String(str)
+    .replace(/&/g, '&')
+    .replace(/"/g, '"')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;');
+}
+
 function detectCommentSyntax(filePath) {
   const ext = path.extname(filePath).toLowerCase();
   if (ext === '.jsx' || ext === '.tsx') {

.opencode/skills/impeccable/reference/live.md

@@ -111,7 +111,9 @@ node .opencode/skills/impeccable/scripts/live-insert.mjs --id EVENT_ID --count E
 
 The scaffold has **no** `data-impeccable-variant="original"`. Variants are net-new HTML+CSS inserted at `insertLine`. Load `brand.md` or `product.md` (freeform only, no action sub-command). Write all variants in one edit, then `--reply done`.
 
-On accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
+For Svelte/SvelteKit targets, `live-insert.mjs` returns `previewMode: "svelte-component"` with `mode: "insert"`, `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each inserted variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`. Insert variants must be non-empty net-new content with a single top-level root, no `data-impeccable-*` attributes, and CSS in each component's `<style>` block. Do **not** edit the route source during generation; the browser mounts the temporary component before/after the live anchor while the user cycles variants. On Accept, `live-accept.mjs` inserts the selected component markup into `sourceFile` immediately and deletes the temp session after the source write succeeds.
+
+For non-Svelte targets, on accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
 
 ### Replace mode (default)
 
@@ -149,6 +151,25 @@ If `--text` matches multiple candidates equally well, wrap exits with `{ error:
 
 Output on success: `{ file, insertLine, commentSyntax, styleMode, styleTag, cssSelectorPrefixExamples, cssAuthoring }`.
 
+For Svelte/SvelteKit targets, `live-wrap.mjs` returns `previewMode: "svelte-component"` with `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`; use the `propContract` prop names for dynamic text (`{propName}`), not literal snapshot strings. Put variant CSS in each component's `<style>` block with semantic class selectors (no `@scope`, no `data-impeccable-*`). Reply with `--file` set to the manifest path; the browser dynamically imports and mounts the compiled components so Svelte HMR does not reset page state while the user cycles variants. On Accept, `live-accept.mjs` inlines the accepted component back into `sourceFile` immediately after source promotion succeeds.
+
+**Params on the Svelte component path go in a sidecar, never as an attribute.** Svelte parses `{` inside an attribute value as the start of an expression, so a `data-impeccable-params='[{…}]'` attribute on a component element fails to compile (`Expected token }`). Declare params for this path in `componentDir/params.json`, keyed by variant number, using the exact param schema from section 7:
+
+```json
+{
+  "1": [
+    {"id":"density","kind":"steps","default":"snug","label":"Density","options":[
+      {"value":"airy","label":"Airy"},{"value":"snug","label":"Snug"},{"value":"packed","label":"Packed"}
+    ]}
+  ],
+  "2": [
+    {"id":"accent","kind":"range","min":0,"max":1,"step":0.05,"default":0.5,"label":"Accent"}
+  ]
+}
+```
+
+Author the component `<style>` against `var(--p-<id>, default)` for `range`/`toggle` and `[data-p-<id>="…"]` for `steps`; wrap those selectors in `:global(...)` so the knob values the runtime sets on the mounted root reach your rules. The browser reads `params.json`, docks the panel, and drives `--p-*` / `data-p-*` on the mounted component exactly as it does for the HTML/JSX path.
+
 `styleMode` controls how preview CSS must be authored. Treat it as a detected capability mode, not a framework guess:
 
 - `scoped`: use `@scope ([data-impeccable-variant="N"])` rules.
@@ -340,7 +361,7 @@ Each variant can expose **coarse** knobs alongside the full HTML/CSS replacement
 
 **Hard cap per variant**: at most **four** parameters so the panel stays legible; rare fifth only if the reference explicitly allows it.
 
-**How to declare.** Put a JSON manifest on the variant wrapper:
+**How to declare.** Put a JSON manifest on the variant wrapper (HTML/JSX path). **On the Svelte `svelte-component` path, do not use this attribute** (Svelte can't compile `{` inside an attribute value). Declare params in `componentDir/params.json` keyed by variant number instead (see the Svelte component paragraph in the wrap section). The param schema below is identical for both paths.
 
 ```html
 <div data-impeccable-variant="1" data-impeccable-params='[
@@ -454,7 +475,7 @@ Do these five steps in the current thread, synchronously, before the next poll.
 1. **Locate the carbonize block** in the source file (`_acceptResult.file`). It's bracketed by `<!-- impeccable-carbonize-start SESSION_ID -->` and `<!-- impeccable-carbonize-end SESSION_ID -->` and contains a `<style data-impeccable-css="SESSION_ID">` element. If the variant declared parameters, an `<!-- impeccable-param-values SESSION_ID: {...} -->` comment sits alongside the style tag with the user's chosen values; read it first; it drives steps 3 and 4 below.
 2. **Move the CSS rules** into the project's real stylesheet. Which stylesheet depends on the project (e.g. `site/styles/workflow.css` for an Astro project, or the component's co-located CSS file for a Vite/Next project; pick whichever already owns styling for the surrounding element).
 3. **Bake in parameter values while rewriting selectors.** For `@scope ([data-impeccable-variant="N"])` wrappers: retarget to real, semantic classes on the accepted HTML (`.why-visual--v2 .v2-label { … }`). For `:scope[data-p-<id>="VALUE"]` selectors: keep only the branch matching the chosen value from the param-values comment; drop the others (they're dead after accept). For `var(--p-<id>, DEFAULT)` in the CSS: either substitute the literal value, or if the param is still useful as a knob going forward, leave the var and update its initial declaration to the chosen value.
-4. **Unwrap the accepted content.** Delete the `<div data-impeccable-variant="N" style="display: contents">` that wraps it. Drop `data-impeccable-params` and any `data-p-*` attributes from it; those are live-mode plumbing, not source.
+4. **Unwrap the accepted content.** Delete the inner `<div data-impeccable-variant="N" style="display: contents">` that wraps it. On JSX/TSX, also delete the outer `<div data-impeccable-carbonize="SESSION_ID" style={{ display: 'contents' }}>` wrapper if present (accept adds it so ternary/`return` slots keep a single root). Drop `data-impeccable-params` and any `data-p-*` attributes; those are live-mode plumbing, not source.
 5. **Delete the inline `<style>` block, the `<!-- impeccable-param-values -->` comment if present, and both `<!-- impeccable-carbonize-start/end -->` markers.** Also drop any `@scope` rules for variants other than the accepted one; those are dead code now.
 
 After the file is clean, run `live-complete.mjs --id SESSION_ID`, verify it reports `phase: "completed"`, then poll again.

.opencode/skills/impeccable/scripts/live-accept.mjs

@@ -17,6 +17,12 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer, writeBuffer as writeManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  findSvelteComponentManifest,
+  inlineSvelteComponentAccept,
+  removeSvelteComponentSession,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -41,6 +47,9 @@ Required:
 
 Options:
   --page-url URL     Current browser page URL; scopes staged copy-edit cleanup
+  --defer-source-write
+                     Deprecated compatibility flag. Svelte component accepts
+                     now write the real source immediately.
 
 Output (JSON):
   { handled, file, carbonize }`);
@@ -64,18 +73,67 @@ Output (JSON):
 
   // Find the file containing this session's markers
   const found = findSessionFile(id, process.cwd());
-  if (!found) {
+  const svelteComponentManifest = found ? null : findSvelteComponentManifest(id, process.cwd());
+
+  if (!found && !svelteComponentManifest) {
     console.log(JSON.stringify({ handled: false, error: 'Session markers not found for id: ' + id }));
     process.exit(0);
   }
 
+  if (svelteComponentManifest) {
+    if (isDiscard) {
+      removeSvelteComponentSession(id, process.cwd());
+      console.log(JSON.stringify({
+        handled: true,
+        file: svelteComponentManifest.sourceFile,
+        carbonize: false,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      }));
+      return;
+    }
+
+    let result;
+    try {
+      result = inlineSvelteComponentAccept(
+        svelteComponentManifest,
+        variantNum,
+        paramValues,
+        process.cwd(),
+      );
+    } catch (err) {
+      result = {
+        handled: false,
+        error: err.message,
+        file: svelteComponentManifest.sourceFile,
+        sourceFile: svelteComponentManifest.sourceFile,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      };
+    }
+    if (result.carbonize) {
+      result.todo = 'REQUIRED before next poll: carbonize cleanup in ' + result.file + '. See reference/live.md "Required after accept".';
+    }
+    console.log(JSON.stringify({ handled: result.handled !== false, ...result }));
+    return;
+  }
+
   const { file: targetFile, content, lines } = found;
   const relFile = path.relative(process.cwd(), targetFile);
+  const previewBlock = findMarkerBlock(id, lines);
+  const sourceShadowPreview = previewBlock
+    ? readSourceShadowPreviewMeta(content, id)
+    : null;
+
+  if (sourceShadowPreview) {
+    console.log(JSON.stringify({
+      handled: false,
+      error: 'source_shadow_preview_deprecated',
+      hint: 'Svelte live mode now uses svelte-component injection. Re-wrap the element and regenerate variants.',
+    }));
+    process.exit(0);
+  }
 
-  // Bail if the session lives in a generated file. The agent manually wrote
-  // the wrapper there for preview, and is responsible for writing the
-  // accepted variant to true source (or cleaning up on discard). See
-  // "Handle fallback" in live.md.
   if (isGeneratedFile(targetFile, { cwd: process.cwd() })) {
     console.log(JSON.stringify({
       handled: false,
@@ -207,6 +265,71 @@ function handleDiscard(id, lines, targetFile) {
 // Accept
 // ---------------------------------------------------------------------------
 
+/**
+ * Build carbonize stitch-in lines. JSX targets occupy a single child slot
+ * (ternary branch, return value, etc.) — the same constraint as live-wrap.
+ * When isJsx, tuck markers + <style> + variant wrapper inside one outer
+ * <div data-impeccable-carbonize> so the slot keeps a single root node.
+ */
+function buildCarbonizeReplacement({
+  indent,
+  commentSyntax,
+  isJsx,
+  id,
+  variantNum,
+  cssContent,
+  paramValues,
+  restored,
+}) {
+  const lines = [];
+  if (!cssContent) {
+    lines.push(...restored);
+    return lines;
+  }
+
+  const variantStyleAttr = isJsx
+    ? "style={{ display: 'contents' }}"
+    : 'style="display: contents"';
+
+  const pushCarbonizeBody = (bodyIndent) => {
+    const bodyRestored = reindentContent(restored, indent, bodyIndent + '  ');
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    for (const cssLine of cssContent) {
+      lines.push(bodyIndent + cssLine.trimStart());
+    }
+    lines.push(bodyIndent + (isJsx ? '`}</style>' : '</style>'));
+    if (paramValues && Object.keys(paramValues).length > 0) {
+      lines.push(
+        bodyIndent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close,
+      );
+    }
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<div data-impeccable-variant="' + variantNum + '" ' + variantStyleAttr + '>');
+    lines.push(...bodyRestored);
+    lines.push(bodyIndent + '</div>');
+  };
+
+  if (isJsx) {
+    const wrapperStyle = 'style={{ display: "contents" }}';
+    lines.push(indent + '<div data-impeccable-carbonize="' + id + '" ' + wrapperStyle + '>');
+    pushCarbonizeBody(indent + '  ');
+    lines.push(indent + '</div>');
+  } else {
+    pushCarbonizeBody(indent);
+  }
+
+  return lines;
+}
+
+function reindentContent(contentLines, fromIndent, toIndent) {
+  return contentLines.map((line) => {
+    if (line.trim() === '') return '';
+    if (line.startsWith(fromIndent)) return toIndent + line.slice(fromIndent.length);
+    return toIndent + line.trimStart();
+  });
+}
+
 function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const block = findMarkerBlock(id, lines);
   if (!block) return { handled: false, error: 'Markers not found' };
@@ -235,45 +358,17 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const hasHelperAttrs = variantText.includes('data-impeccable-variant');
   const needsCarbonize = !!(cssContent || hasHelperAttrs);
 
-  // Build the replacement
   const restored = deindentContent(variantContent, indent);
-  const replacement = [];
+  const replacement = buildCarbonizeReplacement({
-
+    indent,
-  if (cssContent) {
+    commentSyntax,
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    isJsx,
-    // JSX targets need the CSS body wrapped in a template literal so that the
+    id,
-    // `{` and `}` in CSS rules don't get parsed as JSX expressions.
+    variantNum,
-    replacement.push(indent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    cssContent,
-    // Re-indent CSS content to match
+    paramValues,
-    for (const cssLine of cssContent) {
+    restored,
-      replacement.push(indent + cssLine.trimStart());
+  });
-    }
-    replacement.push(indent + (isJsx ? '`}</style>' : '</style>'));
-    if (paramValues && Object.keys(paramValues).length > 0) {
-      // Preserve the user's knob positions for the carbonize-cleanup agent
-      // to bake into the final CSS when it collapses scoped rules.
-      replacement.push(indent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close);
-    }
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
-  }
-
-  // Keep the `@scope ([data-impeccable-variant="N"])` selectors in the
-  // carbonize CSS block working visually by re-wrapping the accepted content
-  // in a data-impeccable-variant="N" div with `display: contents` (so layout
-  // isn't affected). The carbonize agent strips this attribute + wrapper when
-  // it moves the CSS to a proper stylesheet.
-  //
-  // Style attribute syntax has to follow the host file's flavor — JSX files
-  // need the object form, otherwise React 19 throws "Failed to set indexed
-  // property [0] on CSSStyleDeclaration" while parsing the string char-by-char.
-  if (cssContent) {
-    const styleAttr = isJsx ? "style={{ display: 'contents' }}" : 'style="display: contents"';
-    replacement.push(indent + '<div data-impeccable-variant="' + variantNum + '" ' + styleAttr + '>');
-    replacement.push(...restored);
-    replacement.push(indent + '</div>');
-  } else {
-    replacement.push(...restored);
-  }
 
   const newLines = [
     ...lines.slice(0, replaceRange.start),
@@ -285,6 +380,34 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   return { carbonize: needsCarbonize, acceptedOriginalText: originalContent.join('\n') };
 }
 
+function readSourceShadowPreviewMeta(content, id) {
+  const escaped = escapeRegExp(id);
+  const wrapperRe = new RegExp('<[^>]+data-impeccable-variants=(["\'])' + escaped + '\\1[^>]*>');
+  const match = String(content || '').match(wrapperRe);
+  if (!match) return null;
+  const tag = match[0];
+  if (readHtmlAttr(tag, 'data-impeccable-preview') !== 'source-shadow') return null;
+  const sourceFile = readHtmlAttr(tag, 'data-impeccable-source-file');
+  const sourceStartLine = Number(readHtmlAttr(tag, 'data-impeccable-source-start'));
+  const sourceEndLine = Number(readHtmlAttr(tag, 'data-impeccable-source-end'));
+  if (!sourceFile || !Number.isFinite(sourceStartLine) || !Number.isFinite(sourceEndLine)) return null;
+  return { sourceFile, sourceStartLine, sourceEndLine };
+}
+
+function readHtmlAttr(tag, name) {
+  const match = String(tag || '').match(new RegExp('\\s' + escapeRegExp(name) + '\\s*=\\s*(["\'])(.*?)\\1'));
+  if (!match) return null;
+  return decodeHtmlAttr(match[2]);
+}
+
+function decodeHtmlAttr(value) {
+  return String(value || '')
+    .replace(/&quot;/g, '"')
+    .replace(/&lt;/g, '<')
+    .replace(/&gt;/g, '>')
+    .replace(/&amp;/g, '&');
+}
+
 // ---------------------------------------------------------------------------
 // Parsing helpers
 // ---------------------------------------------------------------------------
@@ -686,4 +809,4 @@ if (_running?.endsWith('live-accept.mjs') || _running?.endsWith('live-accept.mjs
   acceptCli();
 }
 
-export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock };
+export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock, applyDeferredSvelteComponentAccepts };

.opencode/skills/impeccable/scripts/live-completion.mjs

@@ -3,6 +3,7 @@ export function completionTypeForAcceptResult(eventType, acceptResult) {
   if (acceptResult?.handled === true && acceptResult?.carbonize === true) return 'agent_done';
   if (acceptResult?.handled === true) return 'complete';
   if (acceptResult?.mode === 'error') return 'error';
+  if (eventType === 'accept' && acceptResult?.previewMode === 'svelte-component') return 'error';
   return 'agent_done';
 }
 

.opencode/skills/impeccable/scripts/live-inject.mjs

@@ -17,11 +17,38 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { resolveLiveConfigPath } from './impeccable-paths.mjs';
+import {
+  applySvelteKitLiveAdapter,
+  detectSvelteKitProject,
+  removeSvelteKitLiveAdapter,
+} from './live-sveltekit-adapter.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const CONFIG_PATH = resolveLiveConfigPath({ cwd: process.cwd(), scriptsDir: __dirname });
 const MARKER_OPEN_TEXT = 'impeccable-live-start';
 const MARKER_CLOSE_TEXT = 'impeccable-live-end';
+const IGNORE_MARKER_OPEN = '# impeccable-live-ignore-start';
+const IGNORE_MARKER_CLOSE = '# impeccable-live-ignore-end';
+
+export const LIVE_IGNORE_PATTERNS = Object.freeze([
+  '.impeccable/hook.cache.json',
+  '.impeccable/live/server.json',
+  '.impeccable/live/sessions/',
+  '.impeccable/live/previews/',
+  '.impeccable/live/annotations/',
+  '.impeccable/live/cache/',
+  '.impeccable/live/manual-edit-apply-transaction.json',
+  '.impeccable/live/manual-edit-events.jsonl',
+  '.impeccable/live/manual-edit-evidence/',
+  '.impeccable/live/pending-manual-edits.json',
+  '.impeccable/live/deferred-svelte-component-accepts.json',
+  '.impeccable-live.json',
+  '.impeccable-live/',
+  'node_modules/.impeccable-live/',
+  'src/lib/impeccable/ImpeccableLiveRoot.svelte',
+  'src/lib/impeccable/__runtime.js',
+  'src/lib/impeccable/[0-9a-f]*/',
+]);
 
 /**
  * Hard-excluded directory patterns. These are NEVER user-facing pages and
@@ -83,8 +110,14 @@ Output (JSON):
   validateConfig(config);
 
   const resolvedFiles = resolveFiles(process.cwd(), config);
+  const svelteKit = detectSvelteKitProject(process.cwd(), config);
 
   if (args.includes('--remove')) {
+    if (svelteKit) {
+      const adapterResult = removeSvelteKitLiveAdapter({ cwd: process.cwd(), config });
+      console.log(JSON.stringify({ ok: true, adapter: 'sveltekit', results: [adapterResult] }));
+      return;
+    }
     const results = resolvedFiles.map((relFile) => {
       const absFile = path.resolve(process.cwd(), relFile);
       if (!fs.existsSync(absFile)) return { file: relFile, error: 'file_not_found' };
@@ -110,6 +143,13 @@ Output (JSON):
     console.error(JSON.stringify({ ok: false, error: 'missing_port' }));
     process.exit(1);
   }
+  const gitIgnore = ensureLiveGitIgnores(process.cwd());
+
+  if (svelteKit) {
+    const adapterResult = applySvelteKitLiveAdapter({ cwd: process.cwd(), port, config });
+    console.log(JSON.stringify({ ok: true, port, adapter: 'sveltekit', gitIgnore, results: [adapterResult] }));
+    return;
+  }
 
   const results = resolvedFiles.map((relFile) => {
     const absFile = path.resolve(process.cwd(), relFile);
@@ -129,10 +169,68 @@ Output (JSON):
     };
   });
   const anyInserted = results.some((r) => r.inserted);
-  console.log(JSON.stringify({ ok: anyInserted, port, results }));
+  console.log(JSON.stringify({ ok: anyInserted, port, gitIgnore, results }));
   if (!anyInserted) process.exit(1);
 }
 
+export function ensureLiveGitIgnores(cwd = process.cwd()) {
+  const target = resolveIgnoreTarget(cwd);
+  const existing = fs.existsSync(target.path) ? fs.readFileSync(target.path, 'utf-8') : '';
+  const block = [
+    IGNORE_MARKER_OPEN,
+    ...LIVE_IGNORE_PATTERNS,
+    IGNORE_MARKER_CLOSE,
+  ].join('\n');
+  const markerRe = new RegExp(`${escapeRegExp(IGNORE_MARKER_OPEN)}[\\s\\S]*?${escapeRegExp(IGNORE_MARKER_CLOSE)}`);
+
+  let updated;
+  if (markerRe.test(existing)) {
+    updated = existing.replace(markerRe, block);
+  } else {
+    const prefix = existing.length === 0 ? '' : existing.endsWith('\n') ? existing : existing + '\n';
+    updated = `${prefix}${prefix.endsWith('\n\n') || prefix === '' ? '' : '\n'}${block}\n`;
+  }
+
+  if (updated !== existing) {
+    fs.mkdirSync(path.dirname(target.path), { recursive: true });
+    fs.writeFileSync(target.path, updated, 'utf-8');
+  }
+
+  return {
+    file: path.relative(cwd, target.path).split(path.sep).join('/'),
+    mode: target.mode,
+    changed: updated !== existing,
+    patterns: [...LIVE_IGNORE_PATTERNS],
+  };
+}
+
+function resolveIgnoreTarget(cwd) {
+  const gitExcludePath = resolveGitInfoExcludePath(cwd);
+  if (gitExcludePath) {
+    return { path: gitExcludePath, mode: 'git-info-exclude' };
+  }
+  return { path: path.join(cwd, '.gitignore'), mode: 'gitignore' };
+}
+
+function resolveGitInfoExcludePath(cwd) {
+  const dotGit = path.join(cwd, '.git');
+  if (!fs.existsSync(dotGit)) return null;
+
+  const stat = fs.statSync(dotGit);
+  if (stat.isDirectory()) return path.join(dotGit, 'info', 'exclude');
+  if (!stat.isFile()) return null;
+
+  const body = fs.readFileSync(dotGit, 'utf-8').trim();
+  const match = body.match(/^gitdir:\s*(.+)$/i);
+  if (!match) return null;
+  const gitDir = path.isAbsolute(match[1]) ? match[1] : path.resolve(cwd, match[1]);
+  return path.join(gitDir, 'info', 'exclude');
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
 /**
  * Expand config.files (which may contain glob patterns) into a literal list
  * of existing file paths relative to rootDir. Literal entries pass through;

.opencode/skills/impeccable/scripts/live-insert.mjs

@@ -21,6 +21,11 @@ import {
   buildCssAuthoring,
   buildCssSelectorPrefixExamples,
 } from './live-wrap.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentInsertSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const INSERT_POSITIONS = new Set(['before', 'after']);
 
@@ -192,6 +197,41 @@ Output (JSON):
   const styleMode = detectStyleMode(targetFile);
   const isJsx = commentSyntax.open === '{/*';
   const spliceIndex = computeInsertLine(startLine, endLine, position);
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+
+  if (shouldUseSvelteComponentInjection(targetFile)) {
+    const session = scaffoldSvelteComponentInsertSession({
+      id,
+      count,
+      sourceFile: relTargetFile,
+      insertLine: spliceIndex + 1,
+      position,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      anchorLines: lines.slice(startLine, endLine + 1),
+      cwd: process.cwd(),
+    });
+    console.log(JSON.stringify({
+      mode: 'insert',
+      position,
+      file: session.manifestFile,
+      sourceFile: relTargetFile,
+      previewMode: 'svelte-component',
+      componentDir: session.componentDir,
+      propContract: session.propContract,
+      insertLine: 1,
+      sourceInsertLine: spliceIndex + 1,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      commentSyntax,
+      styleMode: 'svelte-component',
+      styleTag: null,
+      cssSelectorPrefixExamples: [],
+      cssAuthoring: buildSvelteComponentCssAuthoring(count),
+    }));
+    return;
+  }
+
   const indent = lines[spliceIndex]?.match(/^(\s*)/)?.[1]
     ?? lines[startLine]?.match(/^(\s*)/)?.[1]
     ?? '';
@@ -216,7 +256,7 @@ Output (JSON):
   console.log(JSON.stringify({
     mode: 'insert',
     position,
-    file: path.relative(process.cwd(), targetFile),
+    file: relTargetFile,
     insertLine: insertLine + 1,
     commentSyntax,
     styleMode: styleMode.mode,

.opencode/skills/impeccable/scripts/live-poll.mjs

@@ -20,6 +20,7 @@ import { readLiveServerInfo } from './impeccable-paths.mjs';
 // that ceiling and loop in `pollOnce` to synthesize a long poll without
 // depending on the standalone undici package.
 export const PER_REQUEST_TIMEOUT_MS = 270_000;
+export const DEFAULT_EVENT_LEASE_MS = 600_000;
 
 const EVENT_TYPES_NEEDING_AGENT_REPLY = new Set(['generate', 'steer', 'manual_edit_apply']);
 
@@ -156,7 +157,7 @@ export async function fetchNextEvent(base, token, { totalDeadline } = {}) {
       ? totalDeadline - Date.now()
       : PER_REQUEST_TIMEOUT_MS;
     const slice = Math.min(Math.max(remaining, 1000), PER_REQUEST_TIMEOUT_MS);
-    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}`);
+    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}&leaseMs=${DEFAULT_EVENT_LEASE_MS}`);
 
     if (res.status === 401) {
       const err = new Error('Authentication failed. The server token may have changed.');
@@ -317,7 +318,7 @@ Modes:
 Options:
   --timeout=MS        One-shot poll timeout in ms (default: 600000). Ignored in --stream mode
   --ack-timeout=MS    Stream mode: max wait for --reply after generate/steer (default: 600000)
-  --file PATH         Attach a source file path to the reply (generate flow)
+  --file PATH         Attach a source file path to the reply (generate/steer flow)
   --data JSON         Attach a JSON result object to the reply (manual_edit_apply flow). Must be valid JSON
   --help              Show this help message
 

.opencode/skills/impeccable/scripts/live-server.mjs

@@ -42,6 +42,10 @@ import {
 } from './live-manual-edits-buffer.mjs';
 import { buildManualEditEvidence } from './live-manual-edit-evidence.mjs';
 import { commitManualEdits } from './live-commit-manual-edits.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  removeAllSvelteComponentSessions,
+} from './live-svelte-component.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 // PRODUCT.md / DESIGN.md live wherever context.mjs resolves. The generated
@@ -103,6 +107,7 @@ const MIN_MANUAL_EDIT_APPLY_CHUNK_SIZE = 1;
 const MAX_MANUAL_EDIT_APPLY_CHUNK_SIZE = 20;
 const MANUAL_APPLY_COMPACT_TEXT_LIMIT = 240;
 const MANUAL_APPLY_COMPACT_NEARBY_LIMIT = 4;
+const POLL_LEASE_EXPIRY_TIMER_GRACE_MS = 2;
 const DEBUG_MANUAL_EDIT_EVENTS = /^(1|true|yes)$/i.test(process.env.IMPECCABLE_LIVE_DEBUG_EVENTS || '');
 
 function tombstoneTimedOutApplyId(eventId, details = {}) {
@@ -897,6 +902,8 @@ function leaseEvent(entry, leaseMs) {
     return entry.event;
   }
   entry.leaseUntil = Date.now() + leaseMs;
+  scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return entry.event;
 }
 
@@ -907,9 +914,16 @@ function acknowledgePendingEvent(id) {
   const acknowledged = state.pendingEvents[idx].event;
   state.pendingEvents.splice(idx, 1);
   scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return acknowledged;
 }
 
+function findPendingEventById(id) {
+  if (!id) return null;
+  const entry = state.pendingEvents.find((item) => item.event?.id === id);
+  return entry?.event || null;
+}
+
 function manualApplyReplyCommand(eventOrId = 'EVENT_ID') {
   const id = typeof eventOrId === 'string' ? eventOrId : eventOrId?.id || 'EVENT_ID';
   return `live-poll.mjs --reply ${id} done --data '<json>'`;
@@ -955,6 +969,42 @@ function summarizePendingEventForStatus(entry) {
   return summary;
 }
 
+function summarizeActiveSessionForClient(snapshot = {}) {
+  return {
+    id: snapshot.id,
+    phase: snapshot.phase,
+    pageUrl: snapshot.pageUrl ?? null,
+    sourceFile: snapshot.sourceFile ?? null,
+    previewFile: snapshot.previewFile ?? null,
+    previewMode: snapshot.previewMode ?? null,
+    expectedVariants: snapshot.expectedVariants ?? 0,
+    arrivedVariants: snapshot.arrivedVariants ?? 0,
+    visibleVariant: snapshot.visibleVariant ?? null,
+    checkpointRevision: snapshot.checkpointRevision ?? 0,
+    paramValues: snapshot.paramValues || {},
+  };
+}
+
+function activeSessionSummaries() {
+  if (!state.sessionStore) return [];
+  return state.sessionStore.listActiveSessions().map((snapshot) => summarizeActiveSessionForClient(snapshot));
+}
+
+function cancelQueuedAnonymousExitEvents() {
+  let removed = 0;
+  for (let i = state.pendingEvents.length - 1; i >= 0; i -= 1) {
+    const event = state.pendingEvents[i]?.event;
+    if (event?.type !== 'exit' || event.id) continue;
+    state.pendingEvents.splice(i, 1);
+    removed += 1;
+  }
+  if (removed > 0) {
+    scheduleLeaseFlush();
+    broadcastAgentPollingIfChanged();
+  }
+  return removed;
+}
+
 function cancelPendingManualApplyEvents(pageUrl, reason = 'manual_edit_discarded') {
   const canceledById = new Map();
   const shouldCancel = (event) => event?.type === 'manual_edit_apply' && (!pageUrl || event.pageUrl === pageUrl);
@@ -1001,7 +1051,6 @@ function scheduleLeaseFlush() {
     clearTimeout(state.leaseTimer);
     state.leaseTimer = null;
   }
-  if (state.pendingPolls.length === 0) return;
   const now = Date.now();
   const nextLeaseUntil = state.pendingEvents
     .map((entry) => entry.leaseUntil || 0)
@@ -1011,7 +1060,8 @@ function scheduleLeaseFlush() {
   state.leaseTimer = setTimeout(() => {
     state.leaseTimer = null;
     flushPendingPolls();
-  }, Math.max(0, nextLeaseUntil - now));
+    broadcastAgentPollingIfChanged();
+  }, Math.max(0, nextLeaseUntil - now + POLL_LEASE_EXPIRY_TIMER_GRACE_MS));
 }
 
 function flushPendingPolls() {
@@ -1032,7 +1082,9 @@ function flushPendingPolls() {
 }
 
 function agentPollingConnected() {
-  return state.pendingPolls.length > 0;
+  const now = Date.now();
+  return state.pendingPolls.length > 0
+    || state.pendingEvents.some((entry) => entry.leaseUntil && entry.leaseUntil > now);
 }
 
 function broadcastAgentPollingIfChanged() {
@@ -1318,7 +1370,7 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/status') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401, { 'Content-Type': 'application/json' }); res.end(JSON.stringify({ error: 'Unauthorized' })); return; }
-      const sessions = state.sessionStore ? state.sessionStore.listActiveSessions() : [];
+      const sessions = activeSessionSummaries();
       res.writeHead(200, { 'Content-Type': 'application/json' });
       res.end(JSON.stringify({
         status: 'ok',
@@ -1423,6 +1475,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/events' && req.method === 'GET') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401); res.end('Unauthorized'); return; }
+      clearTimeout(state.exitTimer);
+      state.exitTimer = null;
+      cancelQueuedAnonymousExitEvents();
       res.writeHead(200, {
         'Content-Type': 'text/event-stream',
         'Cache-Control': 'no-cache',
@@ -1432,10 +1487,10 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
         type: 'connected',
         hasProjectContext: hasProjectContext(),
         agentPolling: agentPollingConnected(),
+        activeSessions: activeSessionSummaries(),
       }) + '\n\n');
 
       state.sseClients.add(res);
-      clearTimeout(state.exitTimer);
 
       // Keepalive: SSE comment every 30s prevents silent connection drops.
       const heartbeat = setInterval(() => {
@@ -1827,6 +1882,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
             return;
           }
         }
+        if (msg.type === 'exit') {
+          cleanupSvelteComponentSessionsBeforeExit();
+        }
         if (msg.type !== 'checkpoint') {
           enqueueEvent(msg);
         }
@@ -1905,6 +1963,36 @@ function handlePollGet(req, res, url) {
   });
 }
 
+function sessionFileMetadataFromPollReply(file) {
+  if (!file || typeof file !== 'string') return { file };
+  const normalized = file.split(path.sep).join('/');
+  const base = { file: normalized };
+  if (!normalized.endsWith('/manifest.json') && normalized !== 'manifest.json') return base;
+  if (!normalized.includes('node_modules/.impeccable-live/') && !normalized.includes('src/lib/impeccable/')) return base;
+
+  let full;
+  try {
+    full = path.resolve(process.cwd(), normalized);
+    const rel = path.relative(process.cwd(), full);
+    if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) return base;
+  } catch {
+    return base;
+  }
+
+  try {
+    const manifest = JSON.parse(fs.readFileSync(full, 'utf-8'));
+    if (manifest?.previewMode !== 'svelte-component' || !manifest.sourceFile) return base;
+    return {
+      file: String(manifest.sourceFile).split(path.sep).join('/'),
+      sourceFile: String(manifest.sourceFile).split(path.sep).join('/'),
+      previewFile: normalized,
+      previewMode: 'svelte-component',
+    };
+  } catch {
+    return base;
+  }
+}
+
 function handlePollPost(req, res) {
   let body = '';
   req.on('data', (c) => { body += c; });
@@ -1965,6 +2053,16 @@ function handlePollPost(req, res) {
       res.end(JSON.stringify({ error: 'stale_manual_edit_apply_reply', ...rollback }));
       return;
     }
+    const pendingEventBeforeAck = findPendingEventById(msg.id);
+    if (pendingEventBeforeAck?.type === 'steer' && msg.type === 'steer_done'
+        && !msg.file && !(typeof msg.message === 'string' && msg.message.trim())) {
+      res.writeHead(400, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({
+        error: 'steer_done_requires_file_or_message',
+        hint: 'Reply with --file after writing source, or include a message explaining an intentional no-op.',
+      }));
+      return;
+    }
     const acknowledgedEvent = acknowledgePendingEvent(msg.id);
     let skipJournalReply = false;
     let existingSession = null;
@@ -1987,6 +2085,7 @@ function handlePollPost(req, res) {
       }));
       return;
     }
+    const replyFileMeta = sessionFileMetadataFromPollReply(msg.file);
     if (state.sessionStore && msg.id && !skipJournalReply) {
       try {
         const eventType = msg.type === 'steer_done'
@@ -2001,7 +2100,10 @@ function handlePollPost(req, res) {
         state.sessionStore.appendEvent({
           type: eventType,
           id: msg.id,
-          file: msg.file,
+          file: replyFileMeta.file,
+          sourceFile: replyFileMeta.sourceFile,
+          previewFile: replyFileMeta.previewFile,
+          previewMode: replyFileMeta.previewMode,
           message: msg.message,
           sourceEventType: acknowledgedEvent?.type,
           carbonize: msg.data?.carbonize === true,
@@ -2010,7 +2112,16 @@ function handlePollPost(req, res) {
     }
     flushPendingPolls();
     // Forward the reply to the browser via SSE
-    broadcast({ type: msg.type || 'done', id: msg.id, message: msg.message, file: msg.file, data: msg.data });
+    broadcast({
+      type: msg.type || 'done',
+      id: msg.id,
+      message: msg.message,
+      file: msg.file,
+      sourceFile: replyFileMeta.sourceFile,
+      previewFile: replyFileMeta.previewFile,
+      previewMode: replyFileMeta.previewMode,
+      data: msg.data,
+    });
     res.writeHead(200, { 'Content-Type': 'application/json' });
     res.end(JSON.stringify({ ok: true }));
   });
@@ -2023,6 +2134,7 @@ function handlePollPost(req, res) {
 let httpServer = null;
 
 function shutdown() {
+  cleanupSvelteComponentSessionsBeforeExit();
   removeLiveServerInfo(process.cwd());
   if (state.leaseTimer) clearTimeout(state.leaseTimer);
   state.leaseTimer = null;
@@ -2037,6 +2149,25 @@ function shutdown() {
   process.exit(0);
 }
 
+function cleanupSvelteComponentSessionsBeforeExit() {
+  try {
+    removeAllSvelteComponentSessions(process.cwd());
+  } catch (err) {
+    console.warn('[impeccable] Svelte component session cleanup failed:', err.message);
+  }
+}
+
+function applyLegacyDeferredAcceptsOnStartup() {
+  try {
+    const result = applyDeferredSvelteComponentAccepts(process.cwd());
+    if (result.applied > 0 || result.failed > 0) {
+      console.log('[impeccable] applied legacy deferred Svelte component accepts:', JSON.stringify(result));
+    }
+  } catch (err) {
+    console.warn('[impeccable] legacy deferred Svelte component accept apply failed:', err.message);
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Main
 // ---------------------------------------------------------------------------
@@ -2162,6 +2293,7 @@ rollbackManualApplyTransaction({
   cwd: process.cwd(),
   reason: 'manual_edit_server_start_recovered_abandoned_transaction',
 });
+applyLegacyDeferredAcceptsOnStartup();
 restorePendingEventsFromStore();
 pruneStaleManualApplyEvidence(process.cwd());
 const portArg = args.find(a => a.startsWith('--port='));

.opencode/skills/impeccable/scripts/live-session-store.mjs

@@ -106,6 +106,8 @@ function baseSnapshot(id) {
     phase: 'new',
     pageUrl: null,
     sourceFile: null,
+    previewFile: null,
+    previewMode: null,
     expectedVariants: 0,
     arrivedVariants: 0,
     visibleVariant: null,
@@ -177,8 +179,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
     case 'variants_ready':
     case 'agent_done':
       next.phase = event.carbonize === true ? 'carbonize_required' : 'variants_ready';
-      next.sourceFile = event.file ?? next.sourceFile;
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
-      next.arrivedVariants = event.arrivedVariants ?? (next.arrivedVariants ?? next.expectedVariants);
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.arrivedVariants = event.arrivedVariants ?? (next.expectedVariants || next.arrivedVariants || 0);
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       if (event.carbonize === true) {
@@ -190,12 +194,19 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       }
       break;
     case 'checkpoint':
+      if (COMPLETED_PHASES.has(next.phase)) {
+        next.diagnostics.push({ error: 'checkpoint_after_terminal_ignored', phase: event.phase ?? null, revision: event.revision ?? null });
+        break;
+      }
       if ((event.revision ?? 0) >= (next.checkpointRevision ?? 0)) {
         next.phase = event.phase ?? next.phase;
         next.checkpointRevision = event.revision ?? next.checkpointRevision;
         next.activeOwner = event.owner ?? next.activeOwner;
         next.arrivedVariants = event.arrivedVariants ?? next.arrivedVariants;
         next.visibleVariant = event.visibleVariant ?? next.visibleVariant;
+        next.sourceFile = event.sourceFile ?? next.sourceFile;
+        next.previewFile = event.previewFile ?? next.previewFile;
+        next.previewMode = event.previewMode ?? next.previewMode;
         if (event.paramValues) next.paramValues = { ...event.paramValues };
       } else {
         next.diagnostics.push({ error: 'stale_checkpoint_ignored', revision: event.revision });
@@ -223,6 +234,10 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'steer_done':
       next.phase = 'steer_done';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
+      next.message = event.message ?? next.message;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;
@@ -238,6 +253,9 @@ function applyEvent(snapshot, entry, inheritedDiagnostics = []) {
       break;
     case 'complete':
       next.phase = 'completed';
+      next.sourceFile = event.sourceFile ?? event.file ?? next.sourceFile;
+      next.previewFile = event.previewFile ?? next.previewFile;
+      next.previewMode = event.previewMode ?? next.previewMode;
       next.pendingEventSeq = null;
       next.pendingEvent = null;
       break;

.opencode/skills/impeccable/scripts/live-svelte-component.mjs

@@ -0,0 +1,826 @@
+/**
+ * Svelte live-mode component injection helpers.
+ *
+ * Variants are real .svelte components under node_modules/.impeccable-live/<session-id>/.
+ * The browser mounts them via Svelte 5 mount(); accept inlines the chosen
+ * variant back into the route source with props mapped to original bindings.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+import os from 'node:os';
+import { createHash } from 'node:crypto';
+
+export const SVELTE_COMPONENT_ROOT = 'node_modules/.impeccable-live';
+export const SVELTE_RUNTIME_FILE = `${SVELTE_COMPONENT_ROOT}/__runtime.js`;
+export const DEFERRED_ACCEPTS_FILE = '.impeccable/live/deferred-svelte-component-accepts.json';
+
+const MUSTACHE_RE = /\{([^{}]+)\}/g;
+
+export function shouldUseSvelteComponentInjection(filePath) {
+  if (/^(0|false|no)$/i.test(process.env.IMPECCABLE_LIVE_SVELTE_COMPONENT || '')) return false;
+  return path.extname(filePath).toLowerCase() === '.svelte';
+}
+
+export function componentSessionDir(id, cwd = process.cwd()) {
+  return path.join(cwd, SVELTE_COMPONENT_ROOT, id);
+}
+
+export function manifestPathForSession(id, cwd = process.cwd()) {
+  return path.join(componentSessionDir(id, cwd), 'manifest.json');
+}
+
+export function ensureRuntimeHelper(cwd = process.cwd()) {
+  const file = path.join(cwd, SVELTE_RUNTIME_FILE);
+  if (fs.existsSync(file)) return file;
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, `export { mount, unmount } from 'svelte';\n`, 'utf-8');
+  return file;
+}
+
+/**
+ * Extract ordered unique mustache expressions from markup (not inside <!-- -->).
+ */
+export function extractMustacheExpressions(text) {
+  const expressions = [];
+  const seen = new Set();
+  const lines = String(text || '').split('\n');
+  for (const line of lines) {
+    const trimmed = line.trim();
+    if (trimmed.startsWith('<!--')) continue;
+    let match;
+    MUSTACHE_RE.lastIndex = 0;
+    while ((match = MUSTACHE_RE.exec(line)) !== null) {
+      const expr = match[1].trim();
+      if (!expr || seen.has(expr)) continue;
+      seen.add(expr);
+      expressions.push(expr);
+    }
+  }
+  return expressions;
+}
+
+export function buildPropContract(expressions) {
+  return expressions.map((expr, index) => {
+    const derived = derivePropName(expr, index);
+    return {
+      prop: derived,
+      expr,
+      placeholder: `{${expr}}`,
+    };
+  });
+}
+
+function derivePropName(expr, index) {
+  const tail = expr.match(/(?:\.|\[)(\w+)\s*\]?$/);
+  if (tail && tail[1] && /^[A-Za-z_$][\w$]*$/.test(tail[1])) {
+    return tail[1];
+  }
+  return `prop${index}`;
+}
+
+export function substituteExprsWithProps(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(entry.placeholder).join(`{${entry.prop}}`);
+  }
+  return out;
+}
+
+export function substitutePropsWithExprs(markup, contract) {
+  let out = String(markup || '');
+  for (const entry of contract) {
+    out = out.split(`{${entry.prop}}`).join(`{${entry.expr}}`);
+  }
+  return out;
+}
+
+export function parseSvelteComponentFile(content) {
+  const text = String(content || '');
+  const scriptMatch = text.match(/^([\s\S]*?)<script\b[^>]*>[\s\S]*?<\/script>/i);
+  const withoutScript = scriptMatch ? text.slice(scriptMatch[0].length) : text;
+  const styleMatch = withoutScript.match(/<style\b[^>]*>[\s\S]*?<\/style\s*>/i);
+  const styleBlock = styleMatch ? styleMatch[0] : '';
+  const markup = styleMatch
+    ? withoutScript.slice(0, styleMatch.index).trim()
+    : withoutScript.trim();
+  const cssLines = styleBlock
+    ? styleBlock
+      .replace(/^<style\b[^>]*>/i, '')
+      .replace(/<\/style\s*>$/i, '')
+      .split('\n')
+      .map((line) => line.trimEnd())
+    : [];
+  while (cssLines.length > 0 && cssLines[0].trim() === '') cssLines.shift();
+  while (cssLines.length > 0 && cssLines[cssLines.length - 1].trim() === '') cssLines.pop();
+  return { markup, cssLines, styleBlock };
+}
+
+function buildPropsScript(contract) {
+  if (contract.length === 0) {
+    return '<script>\n  /** @type {Record<string, never>} */\n  let {} = $props();\n</script>\n';
+  }
+  const names = contract.map((c) => c.prop).join(', ');
+  const typeFields = contract.map((c) => `    ${c.prop}: string;`).join('\n');
+  return `<script>\n  /** @type {{\n${typeFields}\n  }} */\n  let { ${names} } = $props();\n</script>\n`;
+}
+
+function buildVariantStub(variantNum, originalWithProps, contract) {
+  const propsComment = contract.length > 0
+    ? `\n<!-- Props: ${contract.map((c) => `${c.prop} <- {${c.expr}}`).join(', ')} -->\n`
+    : '';
+  return `${buildPropsScript(contract)}${propsComment}${originalWithProps.trim()}\n\n<style>\n  /* Variant ${variantNum}: add scoped CSS here */\n</style>\n`;
+}
+
+function buildInsertVariantStub(variantNum) {
+  return `${buildPropsScript([])}<div class="impeccable-insert-preview">Insert variant ${variantNum}</div>\n\n<style>\n  .impeccable-insert-preview { display: block; }\n</style>\n`;
+}
+
+export function scaffoldSvelteComponentSession({
+  id,
+  count,
+  sourceFile,
+  sourceStartLine,
+  sourceEndLine,
+  originalLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const originalMarkup = originalLines.join('\n');
+  const contract = buildPropContract(extractMustacheExpressions(originalMarkup));
+  const originalWithProps = substituteExprsWithProps(originalMarkup, contract);
+
+  const manifest = {
+    id,
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    sourceStartLine,
+    sourceEndLine,
+    count,
+    propContract: contract,
+    originalMarkup,
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildVariantStub(n, originalWithProps, contract), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: contract,
+  };
+}
+
+export function scaffoldSvelteComponentInsertSession({
+  id,
+  count,
+  sourceFile,
+  insertLine,
+  position,
+  anchorStartLine,
+  anchorEndLine,
+  anchorLines,
+  cwd = process.cwd(),
+}) {
+  ensureRuntimeHelper(cwd);
+  const dir = componentSessionDir(id, cwd);
+  fs.mkdirSync(dir, { recursive: true });
+
+  const anchorMarkup = (anchorLines || []).join('\n');
+  const manifest = {
+    id,
+    mode: 'insert',
+    previewMode: 'svelte-component',
+    sourceFile: sourceFile.split(path.sep).join('/'),
+    insertLine,
+    position,
+    anchorStartLine,
+    anchorEndLine,
+    originalMarkup: anchorMarkup,
+    anchorMarkup,
+    count,
+    propContract: [],
+    componentDir: path.relative(cwd, dir).split(path.sep).join('/'),
+    runtimeModule: `/${SVELTE_RUNTIME_FILE}`,
+  };
+
+  fs.writeFileSync(path.join(dir, 'manifest.json'), JSON.stringify(manifest, null, 2) + '\n', 'utf-8');
+
+  for (let n = 1; n <= count; n++) {
+    const variantFile = path.join(dir, `v${n}.svelte`);
+    if (!fs.existsSync(variantFile)) {
+      fs.writeFileSync(variantFile, buildInsertVariantStub(n), 'utf-8');
+    }
+  }
+
+  return {
+    manifest,
+    manifestFile: path.relative(cwd, path.join(dir, 'manifest.json')).split(path.sep).join('/'),
+    componentDir: manifest.componentDir,
+    propContract: [],
+  };
+}
+
+export function findSvelteComponentManifest(id, cwd = process.cwd()) {
+  const direct = manifestPathForSession(id, cwd);
+  if (fs.existsSync(direct)) {
+    return readManifest(direct);
+  }
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return null;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    const candidate = path.join(root, entry.name, 'manifest.json');
+    if (!fs.existsSync(candidate)) continue;
+    try {
+      const manifest = readManifest(candidate);
+      if (manifest?.id === id) return { ...manifest, manifestPath: candidate };
+    } catch { /* skip */ }
+  }
+  return null;
+}
+
+export function readManifest(manifestPath) {
+  const data = JSON.parse(fs.readFileSync(manifestPath, 'utf-8'));
+  return {
+    ...data,
+    manifestPath,
+  };
+}
+
+export function resolveSourceFile(sourceFile, cwd = process.cwd()) {
+  if (!sourceFile || path.isAbsolute(sourceFile)) {
+    throw new Error('Invalid svelte-component source file');
+  }
+  const full = path.resolve(cwd, sourceFile);
+  const rel = path.relative(cwd, full);
+  if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) {
+    throw new Error('Svelte-component source file escapes project root');
+  }
+  if (!fs.existsSync(full)) {
+    throw new Error('Svelte-component source file not found: ' + sourceFile);
+  }
+  return full;
+}
+
+function appendCssToSvelteStyle(lines, cssLines) {
+  const closeIdx = findLastStyleCloseLine(lines);
+  const prepared = ['', ...cssLines.map((line) => (line.trim() === '' ? '' : '  ' + line.trimStart()))];
+  if (closeIdx === -1) {
+    return [...lines, '', '<style>', ...prepared.slice(1), '</style>'];
+  }
+  return [
+    ...lines.slice(0, closeIdx),
+    ...prepared,
+    ...lines.slice(closeIdx),
+  ];
+}
+
+function findLastStyleCloseLine(lines) {
+  for (let i = lines.length - 1; i >= 0; i--) {
+    if (/<\/style\s*>/.test(lines[i])) return i;
+  }
+  return -1;
+}
+
+function bakeParamValuesInCss(cssLines, paramValues) {
+  if (!paramValues || Object.keys(paramValues).length === 0) return cssLines;
+  return cssLines.map((line) => {
+    let out = line;
+    for (const [key, value] of Object.entries(paramValues)) {
+      const varName = `--p-${key}`;
+      out = out.replace(new RegExp(`var\\(${escapeRegExp(varName)}(?:,\\s*[^)]+)?\\)`, 'g'), String(value));
+    }
+    return out;
+  });
+}
+
+function sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues = null, rootTag = 'div') {
+  const css = String((cssLines || []).join('\n'));
+  if (!/data-impeccable-variant|impeccable-variant-ready/.test(css)) return cssLines;
+
+  const rules = parseCssRules(css);
+  const output = [];
+  for (const rule of rules) {
+    appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag);
+  }
+  return output.join('\n')
+    .split('\n')
+    .map((line) => line.trimEnd())
+    .filter((line) => line.trim() !== '');
+}
+
+function appendSanitizedCssRule(output, rule, variantNum, paramValues, rootTag) {
+  const prelude = rule.prelude.trim();
+  const body = rule.body.trim();
+  if (!prelude || !body || /--impeccable-variant-ready\s*:/.test(body)) return;
+
+  if (/^@scope\b/i.test(prelude)) {
+    if (/data-impeccable-variant/.test(prelude) && !selectorHasVariant(prelude, variantNum)) return;
+    const inner = parseCssRules(body);
+    for (const innerRule of inner) {
+      const rewrittenPrelude = rewriteAcceptedSvelteSelector(innerRule.prelude, variantNum, paramValues, rootTag, true);
+      if (!rewrittenPrelude || /--impeccable-variant-ready\s*:/.test(innerRule.body)) continue;
+      output.push(formatCssRule(rewrittenPrelude, innerRule.body.trim()));
+    }
+    return;
+  }
+
+  const rewrittenPrelude = rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, false);
+  if (!rewrittenPrelude) return;
+  output.push(formatCssRule(rewrittenPrelude, body));
+}
+
+function parseCssRules(css) {
+  const rules = [];
+  const text = String(css || '');
+  let i = 0;
+  while (i < text.length) {
+    while (i < text.length && /\s/.test(text[i])) i++;
+    const preludeStart = i;
+    while (i < text.length && text[i] !== '{') i++;
+    if (i >= text.length) break;
+    const prelude = text.slice(preludeStart, i).trim();
+    i++;
+    const bodyStart = i;
+    let depth = 1;
+    let quote = null;
+    let comment = false;
+    while (i < text.length && depth > 0) {
+      const ch = text[i];
+      const next = text[i + 1];
+      if (comment) {
+        if (ch === '*' && next === '/') {
+          comment = false;
+          i += 2;
+          continue;
+        }
+        i++;
+        continue;
+      }
+      if (quote) {
+        if (ch === '\\') {
+          i += 2;
+          continue;
+        }
+        if (ch === quote) quote = null;
+        i++;
+        continue;
+      }
+      if (ch === '/' && next === '*') {
+        comment = true;
+        i += 2;
+        continue;
+      }
+      if (ch === '"' || ch === "'") {
+        quote = ch;
+        i++;
+        continue;
+      }
+      if (ch === '{') depth++;
+      else if (ch === '}') depth--;
+      i++;
+    }
+    const body = text.slice(bodyStart, Math.max(bodyStart, i - 1));
+    if (prelude) rules.push({ prelude, body });
+  }
+  return rules;
+}
+
+function rewriteAcceptedSvelteSelector(prelude, variantNum, paramValues, rootTag, fromScope) {
+  const selectors = splitSelectorList(prelude);
+  const rewritten = [];
+  for (const selector of selectors) {
+    const next = rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope);
+    if (next) rewritten.push(next);
+  }
+  return rewritten.join(', ');
+}
+
+function rewriteAcceptedSvelteSelectorPart(selector, variantNum, paramValues, rootTag, fromScope) {
+  let out = selector.trim();
+  const hasVariant = /data-impeccable-variant/.test(out);
+  if (hasVariant && !selectorHasVariant(out, variantNum)) return '';
+  if (hasVariant) {
+    out = out.replace(variantSelectorRegex(variantNum), '');
+    out = out.replace(/\[data-impeccable-variant=(["']).*?\1\]/g, '');
+  }
+
+  const paramResult = rewriteParamSelectors(out, paramValues);
+  if (!paramResult.keep) return '';
+  out = paramResult.selector;
+
+  out = out
+    .replace(/:scope(?:\[[^\]]+\])?\s*>\s*/g, '')
+    .replace(/:scope(?:\[[^\]]+\])?/g, rootTag || '')
+    .replace(/\s+/g, ' ')
+    .trim();
+
+  out = out.replace(/^[>+~]\s*/, '').trim();
+  if (!out && (hasVariant || fromScope)) return rootTag || ':global(*)';
+  return out;
+}
+
+function rewriteParamSelectors(selector, paramValues) {
+  let keep = true;
+  const next = selector.replace(/\[data-p-([A-Za-z0-9_-]+)(?:=(["'])(.*?)\2)?\]/g, (_match, key, _quote, expected) => {
+    if (!paramValues || !Object.prototype.hasOwnProperty.call(paramValues, key)) return '';
+    const actual = paramValues[key];
+    if (expected != null && String(actual) !== String(expected)) {
+      keep = false;
+      return '';
+    }
+    if (expected == null && (actual === false || actual == null || actual === 'false' || actual === 'off' || actual === '0')) {
+      keep = false;
+      return '';
+    }
+    return '';
+  });
+  return { keep, selector: next };
+}
+
+function splitSelectorList(prelude) {
+  const selectors = [];
+  let start = 0;
+  let bracket = 0;
+  let paren = 0;
+  let quote = null;
+  for (let i = 0; i < prelude.length; i++) {
+    const ch = prelude[i];
+    if (quote) {
+      if (ch === '\\') i++;
+      else if (ch === quote) quote = null;
+      continue;
+    }
+    if (ch === '"' || ch === "'") {
+      quote = ch;
+      continue;
+    }
+    if (ch === '[') bracket++;
+    else if (ch === ']') bracket = Math.max(0, bracket - 1);
+    else if (ch === '(') paren++;
+    else if (ch === ')') paren = Math.max(0, paren - 1);
+    else if (ch === ',' && bracket === 0 && paren === 0) {
+      selectors.push(prelude.slice(start, i));
+      start = i + 1;
+    }
+  }
+  selectors.push(prelude.slice(start));
+  return selectors;
+}
+
+function selectorHasVariant(selector, variantNum) {
+  return variantSelectorRegex(variantNum).test(selector);
+}
+
+function variantSelectorRegex(variantNum) {
+  return new RegExp(`\\[data-impeccable-variant=(["'])${escapeRegExp(String(variantNum))}\\1\\]`, 'g');
+}
+
+function formatCssRule(selector, body) {
+  return `${selector} { ${body.trim()} }`;
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+export function inlineSvelteComponentAccept(manifest, variantNum, paramValues = null, cwd = process.cwd()) {
+  const sourceFile = resolveSourceFile(manifest.sourceFile, cwd);
+  const variantPath = path.join(cwd, manifest.componentDir, `v${variantNum}.svelte`);
+  const resultBase = {
+    file: manifest.sourceFile,
+    sourceFile: manifest.sourceFile,
+    previewMode: 'svelte-component',
+    componentDir: manifest.componentDir,
+    carbonize: false,
+  };
+  if (!fs.existsSync(variantPath)) {
+    return { handled: false, error: `Variant ${variantNum} not found`, ...resultBase };
+  }
+
+  const { markup, cssLines } = parseSvelteComponentFile(fs.readFileSync(variantPath, 'utf-8'));
+  if (manifest.mode === 'insert') {
+    return inlineSvelteComponentInsertAccept({
+      manifest,
+      markup,
+      cssLines,
+      variantNum,
+      paramValues,
+      sourceFile,
+      resultBase,
+      cwd,
+    });
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const contract = manifest.propContract || [];
+  const mergedMarkup = mergeOriginalTopLevelAttrs(markup, manifest.originalMarkup || '');
+  const restoredMarkup = substitutePropsWithExprs(mergedMarkup, contract)
+    .split('\n')
+    .map((line) => line.trimEnd());
+
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const start = Number(manifest.sourceStartLine) - 1;
+  const end = Number(manifest.sourceEndLine) - 1;
+  if (!Number.isInteger(start) || !Number.isInteger(end) || start < 0 || end < start || end >= sourceLines.length) {
+    return { handled: false, error: 'Invalid source line range for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const indent = sourceLines[start].match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, start),
+    ...indentedMarkup,
+    ...sourceLines.slice(end + 1),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function inlineSvelteComponentInsertAccept({
+  manifest,
+  markup,
+  cssLines,
+  variantNum,
+  paramValues,
+  sourceFile,
+  resultBase,
+  cwd,
+}) {
+  if (!svelteMarkupHasVisibleContent(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant is empty', ...resultBase };
+  }
+  if (/\bdata-impeccable-[\w-]*\s*=/.test(markup)) {
+    return { handled: false, error: 'Accepted Svelte insert variant contains preview-only data-impeccable attributes', ...resultBase };
+  }
+
+  const rootTag = matchOpeningTag(markup)?.tag || 'div';
+  const restoredMarkup = String(markup || '')
+    .split('\n')
+    .map((line) => line.trimEnd());
+  const sourceContent = fs.readFileSync(sourceFile, 'utf-8');
+  const sourceLines = sourceContent.split('\n');
+  const insertIndex = Number(manifest.insertLine) - 1;
+  if (!Number.isInteger(insertIndex) || insertIndex < 0 || insertIndex > sourceLines.length) {
+    return { handled: false, error: 'Invalid insert line for ' + manifest.sourceFile, ...resultBase };
+  }
+
+  const nearbyLine = sourceLines[insertIndex] ?? sourceLines[insertIndex - 1] ?? '';
+  const indent = nearbyLine.match(/^(\s*)/)?.[1] || '';
+  const indentedMarkup = restoredMarkup.map((line) => {
+    if (line.trim() === '') return '';
+    return indent + line.trimStart();
+  });
+
+  let newLines = [
+    ...sourceLines.slice(0, insertIndex),
+    ...indentedMarkup,
+    ...sourceLines.slice(insertIndex),
+  ];
+
+  const sanitizedCss = sanitizeAcceptedSvelteCss(cssLines, variantNum, paramValues, rootTag);
+  const bakedCss = bakeParamValuesInCss(sanitizedCss, paramValues);
+  if (bakedCss.length > 0) {
+    newLines = appendCssToSvelteStyle(newLines, bakedCss);
+  }
+
+  try {
+    fs.writeFileSync(sourceFile, newLines.join('\n'), 'utf-8');
+  } catch (err) {
+    return { handled: false, error: 'Failed to write Svelte source: ' + err.message, ...resultBase };
+  }
+  removeSvelteComponentSession(manifest.id, cwd);
+
+  return {
+    handled: true,
+    ...resultBase,
+  };
+}
+
+function svelteMarkupHasVisibleContent(markup) {
+  const text = String(markup || '')
+    .replace(/<script[\s\S]*?<\/script>/gi, '')
+    .replace(/<style[\s\S]*?<\/style>/gi, '')
+    .replace(/<!--[\s\S]*?-->/g, '')
+    .replace(/<[^>]+>/g, ' ')
+    .replace(/\s+/g, ' ')
+    .trim();
+  if (text.length > 0) return true;
+  return /<(img|svg|canvas|video|audio|picture|input|button|select|textarea)\b/i.test(markup || '');
+}
+
+function mergeOriginalTopLevelAttrs(markup, originalMarkup) {
+  const variantOpen = matchOpeningTag(markup);
+  const originalOpen = matchOpeningTag(originalMarkup);
+  if (!variantOpen || !originalOpen) return markup;
+  if (variantOpen.tag.toLowerCase() !== originalOpen.tag.toLowerCase()) return markup;
+
+  const variantAttrs = parseAttrSegments(variantOpen.attrs);
+  const originalAttrs = parseAttrSegments(originalOpen.attrs);
+  const additions = [];
+  let attrs = variantOpen.attrs;
+
+  const originalClass = originalAttrs.get('class');
+  const variantClass = variantAttrs.get('class');
+  if (originalClass && variantClass) {
+    const merged = mergeStaticClassAttr(originalClass, variantClass);
+    if (merged) {
+      attrs = attrs.slice(0, variantClass.start) + merged + attrs.slice(variantClass.end);
+      variantAttrs.set('class', { ...variantClass, raw: merged });
+    }
+  } else if (originalClass && !variantClass) {
+    additions.push(originalClass.raw);
+  }
+
+  for (const [name, attr] of originalAttrs) {
+    if (name === 'class') continue;
+    if (!variantAttrs.has(name)) additions.push(attr.raw);
+  }
+
+  if (additions.length === 0 && attrs === variantOpen.attrs) return markup;
+  const nextOpen = variantOpen.prefix
+    + variantOpen.tag
+    + attrs
+    + additions.map((attr) => ' ' + attr.trim()).join('')
+    + variantOpen.close;
+  return markup.slice(0, variantOpen.index) + nextOpen + markup.slice(variantOpen.index + variantOpen.raw.length);
+}
+
+function matchOpeningTag(markup) {
+  const match = String(markup || '').match(/^(\s*<)([A-Za-z][\w:-]*)([^>]*?)(\/?>)/);
+  if (!match) return null;
+  return {
+    raw: match[0],
+    prefix: match[1],
+    tag: match[2],
+    attrs: match[3] || '',
+    close: match[4],
+    index: match.index || 0,
+  };
+}
+
+function parseAttrSegments(attrs) {
+  const out = new Map();
+  const re = /([A-Za-z_:][\w:.-]*)(?:\s*=\s*(?:"[^"]*"|'[^']*'|\{[^}]*\}|[^\s"'>=]+))?/g;
+  let match;
+  while ((match = re.exec(attrs))) {
+    const raw = match[0];
+    const name = match[1];
+    out.set(name, {
+      name,
+      raw,
+      start: match.index,
+      end: match.index + raw.length,
+    });
+  }
+  return out;
+}
+
+function mergeStaticClassAttr(originalClass, variantClass) {
+  const originalValue = originalClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  const variantValue = variantClass.raw.match(/class\s*=\s*(["'])(.*?)\1/);
+  if (!originalValue || !variantValue) return null;
+  const quote = variantValue[1];
+  const classes = [
+    ...variantValue[2].split(/\s+/),
+    ...originalValue[2].split(/\s+/),
+  ].filter(Boolean);
+  return `class=${quote}${[...new Set(classes)].join(' ')}${quote}`;
+}
+
+export function removeSvelteComponentSession(id, cwd = process.cwd()) {
+  const dir = componentSessionDir(id, cwd);
+  try {
+    fs.rmSync(dir, { recursive: true, force: true });
+  } catch { /* non-fatal */ }
+}
+
+export function removeAllSvelteComponentSessions(cwd = process.cwd()) {
+  const root = path.join(cwd, SVELTE_COMPONENT_ROOT);
+  if (!fs.existsSync(root)) return;
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory()) continue;
+    if (entry.name.startsWith('__')) continue;
+    try {
+      fs.rmSync(path.join(root, entry.name), { recursive: true, force: true });
+    } catch { /* non-fatal */ }
+  }
+}
+
+export function deferredAcceptsPath(cwd = process.cwd()) {
+  const key = createHash('sha1').update(path.resolve(cwd)).digest('hex').slice(0, 16);
+  return path.join(os.tmpdir(), 'impeccable-live', key, 'deferred-svelte-component-accepts.json');
+}
+
+export function readDeferredAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  try {
+    return JSON.parse(fs.readFileSync(file, 'utf-8'));
+  } catch {
+    return { accepts: [] };
+  }
+}
+
+export function writeDeferredAccept(entry, cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  const data = readDeferredAccepts(cwd);
+  data.accepts = (data.accepts || []).filter((item) => item.id !== entry.id);
+  data.accepts.push({ ...entry, createdAt: new Date().toISOString() });
+  fs.writeFileSync(file, JSON.stringify(data, null, 2) + '\n', 'utf-8');
+}
+
+export function applyDeferredSvelteComponentAccepts(cwd = process.cwd()) {
+  const file = deferredAcceptsPath(cwd);
+  const data = readDeferredAccepts(cwd);
+  const pending = Array.isArray(data.accepts) ? data.accepts : [];
+  const results = [];
+  const remaining = [];
+  for (const entry of pending) {
+    try {
+      const manifest = findSvelteComponentManifest(entry.id, cwd);
+      if (!manifest) {
+        results.push({ id: entry.id, ok: false, error: 'manifest not found' });
+        remaining.push(entry);
+        continue;
+      }
+      const result = inlineSvelteComponentAccept(
+        manifest,
+        entry.variantNum,
+        entry.paramValues || null,
+        cwd,
+      );
+      results.push({ id: entry.id, ok: result.handled !== false, result });
+      if (result.handled === false) remaining.push(entry);
+    } catch (err) {
+      results.push({ id: entry.id, ok: false, error: err.message });
+      remaining.push(entry);
+    }
+  }
+  if (remaining.length > 0) {
+    fs.writeFileSync(file, JSON.stringify({ accepts: remaining }, null, 2) + '\n', 'utf-8');
+  } else {
+    try { fs.rmSync(file, { force: true }); } catch {}
+  }
+  return { applied: results.filter((r) => r.ok).length, failed: results.filter((r) => !r.ok).length, results };
+}
+
+export function buildSvelteComponentCssAuthoring(count) {
+  const variantNumbers = Array.from({ length: count }, (_, i) => i + 1);
+  return {
+    mode: 'svelte-component',
+    styleTag: null,
+    strategy: 'component-style-block',
+    rulePattern: '.semantic-class { ... }',
+    selectorExamples: variantNumbers.map(() => '.expense-row { padding: 22px; }'),
+    requirements: [
+      'Write each variant as a real Svelte component file (v1.svelte, v2.svelte, ...).',
+      'Keep the prop names from propContract; bind dynamic text with {propName}, not literal snapshot text.',
+      'Put variant CSS in the component <style> block using semantic class selectors.',
+      'Author param-driven CSS against var(--p-<id>, default) and [data-p-<id>] using :global(...) so the runtime knob values reach the mounted root.',
+      'Declare params in componentDir/params.json keyed by variant number (e.g. {"1": [...], "2": [...]}), NOT as a data-impeccable-params attribute.',
+      'Do not use @scope or data-impeccable-variant selectors in component files.',
+      'Do not edit the route source file during generation; only edit files under componentDir.',
+    ],
+    forbidden: [
+      'Do not use @scope blocks in Svelte component variants.',
+      'Do not copy live DOM snapshot text into markup when propContract provides bindings.',
+      'Do not add data-impeccable-* attributes inside component files. Svelte parses { in attribute values as an expression, so data-impeccable-params with JSON breaks the build; use componentDir/params.json instead.',
+    ],
+    paramsFile: 'params.json',
+  };
+}

.opencode/skills/impeccable/scripts/live-sveltekit-adapter.mjs

@@ -0,0 +1,274 @@
+/**
+ * SvelteKit live-mode adapter.
+ *
+ * SvelteKit must not be patched through src/app.html. That file is a document
+ * template, not framework-owned component chrome. The adapter keeps SvelteKit
+ * work limited to mounting a dev-only shadow host from +layout.svelte; the
+ * actual live UI remains the shared plain-DOM browser chrome.
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+
+export const SVELTE_LIVE_ROOT_COMPONENT = 'src/lib/impeccable/ImpeccableLiveRoot.svelte';
+export const SVELTE_LAYOUT_MARKER_OPEN = '<!-- impeccable-live-svelte-start -->';
+export const SVELTE_LAYOUT_MARKER_CLOSE = '<!-- impeccable-live-svelte-end -->';
+export const SVELTE_ROOT_IMPORT = "import ImpeccableLiveRoot from '$lib/impeccable/ImpeccableLiveRoot.svelte';";
+
+export function detectSvelteKitProject(cwd = process.cwd(), config = null) {
+  const appHtml = findSvelteKitAppHtml(cwd, config);
+  if (!appHtml) return null;
+  const hasTemplateMarkers = fileIncludes(path.join(cwd, appHtml), '%sveltekit.body%')
+    && fileIncludes(path.join(cwd, appHtml), '%sveltekit.head%');
+  if (!hasTemplateMarkers) return null;
+
+  const hasSvelteConfig = fs.existsSync(path.join(cwd, 'svelte.config.js'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.mjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.cjs'))
+    || fs.existsSync(path.join(cwd, 'svelte.config.ts'));
+  const hasKitPackage = packageHasSvelteKit(cwd);
+  if (!hasSvelteConfig && !hasKitPackage) return null;
+
+  return {
+    appHtml,
+    layoutFile: findSvelteKitLayout(cwd),
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function applySvelteKitLiveAdapter({ cwd = process.cwd(), port, config = null } = {}) {
+  if (!Number.isFinite(Number(port))) {
+    throw new Error('SvelteKit live adapter requires a numeric port');
+  }
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  ensureSvelteLiveRootComponent(cwd, Number(port));
+
+  const layoutRel = detected.layoutFile;
+  const layoutAbs = path.join(cwd, layoutRel);
+  fs.mkdirSync(path.dirname(layoutAbs), { recursive: true });
+  const layoutExisted = fs.existsSync(layoutAbs);
+  const before = layoutExisted ? fs.readFileSync(layoutAbs, 'utf-8') : defaultSvelteLayout();
+  const after = patchSvelteLayout(before);
+  fs.writeFileSync(layoutAbs, after, 'utf-8');
+
+  return {
+    file: layoutRel,
+    adapter: 'sveltekit',
+    inserted: after !== before || !layoutExisted,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function removeSvelteKitLiveAdapter({ cwd = process.cwd(), config = null } = {}) {
+  const detected = detectSvelteKitProject(cwd, config);
+  if (!detected) return null;
+
+  const layoutAbs = path.join(cwd, detected.layoutFile);
+  let removed = false;
+  if (fs.existsSync(layoutAbs)) {
+    const before = fs.readFileSync(layoutAbs, 'utf-8');
+    const after = unpatchSvelteLayout(before);
+    if (after !== before) {
+      fs.writeFileSync(layoutAbs, after, 'utf-8');
+      removed = true;
+    }
+  }
+
+  const rootAbs = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  if (fs.existsSync(rootAbs)) {
+    fs.rmSync(rootAbs, { force: true });
+    removed = true;
+  }
+
+  pruneEmptyDir(path.dirname(rootAbs), path.join(cwd, 'src'));
+
+  return {
+    file: detected.layoutFile,
+    adapter: 'sveltekit',
+    removed,
+    appHtmlUntouched: true,
+    rootComponent: SVELTE_LIVE_ROOT_COMPONENT,
+  };
+}
+
+export function patchSvelteLayout(content) {
+  let out = String(content || '');
+  if (!out.includes(SVELTE_ROOT_IMPORT)) {
+    const scriptMatch = out.match(/<script(?:\s[^>]*)?>/i);
+    if (scriptMatch) {
+      const insertAt = scriptMatch.index + scriptMatch[0].length;
+      out = out.slice(0, insertAt) + '\n  ' + SVELTE_ROOT_IMPORT + out.slice(insertAt);
+    } else {
+      out = `<script>\n  ${SVELTE_ROOT_IMPORT}\n</script>\n\n` + out;
+    }
+  }
+
+  if (!out.includes(SVELTE_LAYOUT_MARKER_OPEN)) {
+    const block = `${SVELTE_LAYOUT_MARKER_OPEN}\n<ImpeccableLiveRoot />\n${SVELTE_LAYOUT_MARKER_CLOSE}\n`;
+    const renderMatch = out.match(/\{@render\s+children(?:\?\.)?\(\)\s*\}/);
+    const slotMatch = out.match(/<slot\s*\/?>/);
+    const match = renderMatch || slotMatch;
+    if (match) {
+      out = out.slice(0, match.index) + block + out.slice(match.index);
+    } else {
+      out = out.replace(/\s*$/, '\n\n' + block);
+    }
+  }
+
+  return out;
+}
+
+export function unpatchSvelteLayout(content) {
+  let out = String(content || '');
+  const blockRe = new RegExp(
+    '([ \\t]*)' + escapeRegExp(SVELTE_LAYOUT_MARKER_OPEN)
+    + '\\n<ImpeccableLiveRoot\\s*/>\\n'
+    + escapeRegExp(SVELTE_LAYOUT_MARKER_CLOSE)
+    + '\\n?',
+    'g',
+  );
+  out = out.replace(blockRe, '$1');
+  out = out.replace(new RegExp('^\\s*' + escapeRegExp(SVELTE_ROOT_IMPORT) + '\\s*\\n?', 'gm'), '');
+  out = out.replace(/<script>\s*<\/script>\s*\n?/g, '');
+  return out.replace(/\n{3,}/g, '\n\n');
+}
+
+export function ensureSvelteLiveRootComponent(cwd, port) {
+  const file = path.join(cwd, SVELTE_LIVE_ROOT_COMPONENT);
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(file, buildSvelteLiveRootComponent(port), 'utf-8');
+  return file;
+}
+
+export function buildSvelteLiveRootComponent(port) {
+  return `<script>
+  import { onMount } from 'svelte';
+
+  const LIVE_URL = 'http://localhost:${Number(port)}/live.js';
+  const HOST_ID = 'impeccable-live-root';
+
+  onMount(() => {
+    let host = document.querySelector('impeccable-live-root#' + HOST_ID) || document.getElementById(HOST_ID);
+    if (!host) {
+      host = document.createElement('impeccable-live-root');
+      host.id = HOST_ID;
+      document.body.appendChild(host);
+    }
+
+    host.dataset.impeccableLiveAdapter = 'sveltekit';
+    host.style.setProperty('all', 'initial', 'important');
+    host.style.setProperty('display', 'block', 'important');
+    host.style.setProperty('position', 'fixed', 'important');
+    host.style.setProperty('top', '0', 'important');
+    host.style.setProperty('left', '0', 'important');
+    host.style.setProperty('width', '0', 'important');
+    host.style.setProperty('height', '0', 'important');
+    host.style.setProperty('overflow', 'visible', 'important');
+    host.style.setProperty('z-index', '2147483000', 'important');
+    host.style.setProperty('pointer-events', 'none', 'important');
+
+    const root = host.shadowRoot || host.attachShadow({ mode: 'open' });
+    if (!root.querySelector('style[data-impeccable-live-reset]')) {
+      const reset = document.createElement('style');
+      reset.dataset.impeccableLiveReset = 'true';
+      reset.textContent = ':host, :host *, * { box-sizing: border-box; }';
+      root.appendChild(reset);
+    }
+
+    window.__IMPECCABLE_LIVE_ADAPTER__ = 'sveltekit';
+    window.__IMPECCABLE_LIVE_UI_ROOT__ = root;
+    window.__IMPECCABLE_LIVE_CHROME_MOUNT__ = {
+      adapter: 'sveltekit',
+      version: 1,
+      host,
+      root,
+    };
+
+    const script = document.createElement('script');
+    script.src = LIVE_URL;
+    script.async = true;
+    script.dataset.impeccableLiveScript = 'true';
+    document.head.appendChild(script);
+
+    return () => {
+      script.remove();
+      if (window.__IMPECCABLE_LIVE_UI_ROOT__ === root) delete window.__IMPECCABLE_LIVE_UI_ROOT__;
+      if (window.__IMPECCABLE_LIVE_CHROME_MOUNT__?.root === root) delete window.__IMPECCABLE_LIVE_CHROME_MOUNT__;
+      if (window.__IMPECCABLE_LIVE_ADAPTER__ === 'sveltekit') delete window.__IMPECCABLE_LIVE_ADAPTER__;
+    };
+  });
+</script>
+`;
+}
+
+function findSvelteKitAppHtml(cwd, config) {
+  const files = Array.isArray(config?.files) ? config.files : ['src/app.html'];
+  for (const rel of files) {
+    if (rel.includes('*')) continue;
+    const normalized = rel.split(path.sep).join('/');
+    if (!normalized.endsWith('app.html')) continue;
+    const abs = path.join(cwd, normalized);
+    if (fs.existsSync(abs)) return normalized;
+  }
+  const fallback = 'src/app.html';
+  return fs.existsSync(path.join(cwd, fallback)) ? fallback : null;
+}
+
+function findSvelteKitLayout(cwd) {
+  const candidates = [
+    'src/routes/+layout.svelte',
+    'src/routes/(app)/+layout.svelte',
+  ];
+  for (const rel of candidates) {
+    if (fs.existsSync(path.join(cwd, rel))) return rel;
+  }
+  return 'src/routes/+layout.svelte';
+}
+
+function defaultSvelteLayout() {
+  return `<script>\n  let { children } = $props();\n</script>\n\n{@render children?.()}\n`;
+}
+
+function packageHasSvelteKit(cwd) {
+  const file = path.join(cwd, 'package.json');
+  if (!fs.existsSync(file)) return false;
+  try {
+    const pkg = JSON.parse(fs.readFileSync(file, 'utf-8'));
+    const deps = {
+      ...(pkg.dependencies || {}),
+      ...(pkg.devDependencies || {}),
+      ...(pkg.peerDependencies || {}),
+    };
+    return Boolean(deps['@sveltejs/kit'] || deps['@sveltejs/vite-plugin-svelte'] || deps.svelte);
+  } catch {
+    return false;
+  }
+}
+
+function fileIncludes(file, text) {
+  try {
+    return fs.readFileSync(file, 'utf-8').includes(text);
+  } catch {
+    return false;
+  }
+}
+
+function pruneEmptyDir(dir, stopDir) {
+  let current = dir;
+  while (current.startsWith(stopDir) && current !== stopDir) {
+    try {
+      if (fs.readdirSync(current).length > 0) return;
+      fs.rmdirSync(current);
+      current = path.dirname(current);
+    } catch {
+      return;
+    }
+  }
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}

.opencode/skills/impeccable/scripts/live-ui-core.mjs

@@ -0,0 +1,179 @@
+/**
+ * Framework-neutral Impeccable live chrome contract.
+ *
+ * The production browser bundle is intentionally plain DOM so Svelte, React,
+ * Vue, and static adapters can all mount the same chrome. This module is the
+ * testable contract/inventory for that bundle; live-browser.js mirrors these
+ * values at runtime because it is served as a standalone script.
+ */
+
+export const LIVE_CHROME_MOUNT_CONTRACT = Object.freeze([
+  'root',
+  'transport',
+  'state',
+  'actions',
+]);
+
+export const LIVE_UI_SURFACES = Object.freeze([
+  {
+    key: 'global-bottom-bar',
+    ids: [
+      'impeccable-live-global-bar',
+      'impeccable-live-global-bar-brand',
+      'impeccable-live-pick-toggle',
+      'impeccable-live-insert-toggle',
+      'impeccable-live-detect-toggle',
+      'impeccable-live-detect-badge',
+      'impeccable-live-design-toggle',
+      'impeccable-live-page-chat',
+      'impeccable-live-page-chat-input',
+      'impeccable-live-page-chat-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'active', 'tooltip'],
+  },
+  {
+    key: 'pending-copy-edit-dock',
+    ids: ['impeccable-live-pending-dock'],
+    states: ['closed', 'open', 'hover', 'pressed', 'loading', 'rollback', 'keep-fixing'],
+  },
+  {
+    key: 'element-selection-chrome',
+    ids: [
+      'impeccable-live-highlight',
+      'impeccable-live-tooltip',
+      'impeccable-live-bar',
+      'impeccable-live-configure-input-wrap',
+      'impeccable-live-input',
+      'impeccable-live-configure-voice',
+    ],
+    states: ['rest', 'hover', 'focus-visible', 'pressed', 'disabled'],
+  },
+  {
+    key: 'action-picker',
+    ids: ['impeccable-live-picker'],
+    states: ['closed', 'open', 'option-hover', 'option-focus'],
+  },
+  {
+    key: 'edit-chrome',
+    ids: ['impeccable-live-edit-badge'],
+    states: ['enabled', 'disabled', 'editing', 'cancel', 'save', 'edited-content'],
+  },
+  {
+    key: 'generating-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-shader'],
+    states: ['action-label', 'animated-dots', 'generating', 'done'],
+  },
+  {
+    key: 'variant-cycling-row',
+    ids: ['impeccable-live-bar', 'impeccable-live-params-panel'],
+    states: ['variant-1', 'variant-2', 'variant-3', 'left-disabled', 'right-disabled', 'dot-click', 'accept', 'discard'],
+  },
+  {
+    key: 'variant-params-panel',
+    ids: ['impeccable-live-params-panel'],
+    states: ['closed', 'open-above', 'open-below', 'range', 'steps', 'toggle'],
+  },
+  {
+    key: 'saving-confirmed-rows',
+    ids: ['impeccable-live-bar'],
+    states: ['saving', 'applying-variant', 'confirmed'],
+  },
+  {
+    key: 'insert-mode-chrome',
+    ids: [
+      'impeccable-live-insert-line',
+      'impeccable-live-insert-placeholder',
+      'impeccable-live-placeholder-resize',
+      'impeccable-live-insert-input',
+      'impeccable-live-insert-voice',
+      'impeccable-live-insert-create',
+      'impeccable-live-insert-create-tooltip',
+    ],
+    states: ['toggle-active', 'line', 'placeholder', 'resize', 'enabled', 'disabled', 'tooltip'],
+  },
+  {
+    key: 'annotation-chrome',
+    ids: [
+      'impeccable-live-annot',
+      'impeccable-live-annot-svg',
+      'impeccable-live-annot-pins',
+      'impeccable-live-annot-clear',
+    ],
+    states: ['overlay', 'drawing', 'pin', 'pin-edit', 'clear'],
+  },
+  {
+    key: 'design-system-panel',
+    ids: ['impeccable-live-design-host'],
+    states: ['closed', 'open', 'tabs', 'token-tiles', 'copy'],
+  },
+  {
+    key: 'toasts-and-errors',
+    ids: ['impeccable-live-toast'],
+    states: ['normal', 'error', 'no-variants-mounted'],
+  },
+  {
+    key: 'css-isolation-boundary',
+    ids: ['impeccable-live-root'],
+    states: ['shadow-root', 'style-tags', 'hostile-css'],
+  },
+]);
+
+export const LIVE_UI_COMPONENT_IDS = Object.freeze([
+  ...new Set(LIVE_UI_SURFACES.flatMap((surface) => surface.ids)),
+]);
+
+export function resolveLiveUiRoot(env = globalThis) {
+  const doc = env?.document;
+  const explicit = env?.__IMPECCABLE_LIVE_UI_ROOT__
+    || env?.window?.__IMPECCABLE_LIVE_UI_ROOT__;
+  if (explicit && typeof explicit.appendChild === 'function') return explicit;
+  return doc?.body || null;
+}
+
+export function getLiveUiElementById(id, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (!id) return null;
+  if (root?.getElementById) {
+    const found = root.getElementById(id);
+    if (found) return found;
+  }
+  if (root?.querySelector) {
+    const found = root.querySelector('#' + escapeCssIdent(id));
+    if (found) return found;
+  }
+  return doc?.getElementById?.(id) || null;
+}
+
+export function appendToLiveUiRoot(el, env = globalThis) {
+  const root = resolveLiveUiRoot(env);
+  if (!root) throw new Error('Impeccable live UI root is not available');
+  root.appendChild(el);
+  return el;
+}
+
+export function appendStyleToLiveUiRoot(styleEl, env = globalThis) {
+  const doc = env?.document;
+  const root = resolveLiveUiRoot(env);
+  if (root && root !== doc?.body) {
+    root.appendChild(styleEl);
+  } else {
+    (doc?.head || doc?.body || root).appendChild(styleEl);
+  }
+  return styleEl;
+}
+
+export function activeElementDeep(doc = globalThis.document) {
+  let active = doc?.activeElement || null;
+  while (active?.shadowRoot?.activeElement) {
+    active = active.shadowRoot.activeElement;
+  }
+  return active;
+}
+
+function escapeCssIdent(value) {
+  if (typeof CSS !== 'undefined' && typeof CSS.escape === 'function') {
+    return CSS.escape(String(value));
+  }
+  return String(value).replace(/([ !"#$%&'()*+,./:;<=>?@[\\\]^`{|}~])/g, '\\$1');
+}

.opencode/skills/impeccable/scripts/live-wrap.mjs

@@ -15,6 +15,11 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -262,6 +267,8 @@ The agent should insert variant HTML at insertLine.`);
     .map((l) => (l.trim() === '' ? '' : indent + extra + l.slice(originalBaseIndent)))
     .join('\n');
   const originalIndented = reindentOriginal('    ');
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+  const useSvelteComponent = shouldUseSvelteComponentInjection(targetFile);
 
   // Wrapper attributes differ by syntax. HTML allows plain string attrs;
   // JSX requires object-literal style and parses string attrs as HTML (which
@@ -302,38 +309,75 @@ The agent should insert variant HTML at insertLine.`);
     indent + commentSyntax.open + ' impeccable-variants-end ' + id + ' ' + commentSyntax.close,
   ];
 
-  // Replace the original element with the wrapper
+  let outputFile = targetFile;
-  const newLines = [
+  let outputLines;
-    ...lines.slice(0, startLine),
+  let outputStartLine = startLine + 1;
-    ...wrapperLines,
+  let outputEndLine = startLine + wrapperLines.length + (originalLines.length - 1);
-    ...lines.slice(endLine + 1),
+  let insertLine;
-  ];
+  let svelteSession = null;
-  fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
 
-  // Calculate insert line (the "insert below this line" comment).
+  if (useSvelteComponent) {
-  // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // Svelte/SvelteKit resets component-local state on markup HMR updates.
-  // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // Keep generation source-neutral: agents write real variant components
-  // original-div + content + close-original-div; JSX: outer-div +
+    // under the generated componentDir, the browser mounts them into the live
-  // start-comment + Original-comment + original-div + content +
+    // DOM, and live-accept.mjs inlines the accepted variant back into the route.
-  // close-original-div). Multi-line originals push the marker by their
+    svelteSession = scaffoldSvelteComponentSession({
-  // extra line count.
+      id,
-  const insertLine = startLine + 6 + (originalLines.length - 1);
+      count,
+      sourceFile: relTargetFile,
+      sourceStartLine: startLine + 1,
+      sourceEndLine: endLine + 1,
+      originalLines,
+      cwd: process.cwd(),
+    });
+    outputFile = path.resolve(process.cwd(), svelteSession.manifestFile);
+    outputStartLine = 1;
+    outputEndLine = 1;
+    insertLine = 1;
+  } else {
+    // Replace the original element with the wrapper
+    const newLines = [
+      ...lines.slice(0, startLine),
+      ...wrapperLines,
+      ...lines.slice(endLine + 1),
+    ];
+    fs.writeFileSync(targetFile, newLines.join('\n'), 'utf-8');
+
+    // Calculate insert line (the "insert below this line" comment).
+    // 0-indexed file position. Both HTML and JSX wrappers have 6 lines above
+    // the insert marker (HTML: start-comment + outer-div + Original-comment +
+    // original-div + content + close-original-div; JSX: outer-div +
+    // start-comment + Original-comment + original-div + content +
+    // close-original-div). Multi-line originals push the marker by their
+    // extra line count.
+    insertLine = startLine + 6 + (originalLines.length - 1) + 1;
+  }
+
+  const outputRelFile = path.relative(process.cwd(), outputFile).split(path.sep).join('/');
+
+  const svelteComponentAuthoring = useSvelteComponent ? buildSvelteComponentCssAuthoring(count) : null;
 
   console.log(JSON.stringify({
-    file: path.relative(process.cwd(), targetFile),
+    file: outputRelFile,
-    startLine: startLine + 1,       // 1-indexed for the agent
+    sourceFile: useSvelteComponent ? relTargetFile : undefined,
+    previewMode: useSvelteComponent ? 'svelte-component' : undefined,
+    componentDir: svelteSession?.componentDir,
+    propContract: svelteSession?.propContract,
+    sourceStartLine: useSvelteComponent ? startLine + 1 : undefined,
+    sourceEndLine: useSvelteComponent ? endLine + 1 : undefined,
+    startLine: outputStartLine,       // 1-indexed for the agent
     // wrapperLines is an array but one element (the original-content slot)
     // is a `\n`-joined multi-line string, so the actual file-row count is
     // wrapperLines.length + (originalLines.length - 1). Without the offset,
     // endLine pointed inside the wrapper for any picked element that
     // spanned more than one source line.
-    endLine: startLine + wrapperLines.length + (originalLines.length - 1), // 1-indexed
+    endLine: outputEndLine, // 1-indexed
-    insertLine: insertLine + 1,     // 1-indexed: where variants go
+    insertLine,            // 1-indexed: where variants go
     commentSyntax: commentSyntax,
-    styleMode: styleMode.mode,
+    styleMode: useSvelteComponent ? 'svelte-component' : styleMode.mode,
-    styleTag: styleMode.styleTag,
+    styleTag: useSvelteComponent ? null : styleMode.styleTag,
-    cssSelectorPrefixExamples: buildCssSelectorPrefixExamples(styleMode.mode, count),
+    cssSelectorPrefixExamples: useSvelteComponent ? [] : buildCssSelectorPrefixExamples(styleMode.mode, count),
-    cssAuthoring: buildCssAuthoring(styleMode, count),
+    cssAuthoring: useSvelteComponent ? svelteComponentAuthoring : buildCssAuthoring(styleMode, count),
     originalLineCount: originalLines.length,
   }));
 }
@@ -527,6 +571,14 @@ function splitClassList(classes) {
   return String(classes).split(/[,\s]+/).map(c => c.trim()).filter(Boolean);
 }
 
+function attrEscapeDouble(str) {
+  return String(str)
+    .replace(/&/g, '&')
+    .replace(/"/g, '"')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;');
+}
+
 function detectCommentSyntax(filePath) {
   const ext = path.extname(filePath).toLowerCase();
   if (ext === '.jsx' || ext === '.tsx') {

.pi/skills/impeccable/reference/live.md

@@ -111,7 +111,9 @@ node .pi/skills/impeccable/scripts/live-insert.mjs --id EVENT_ID --count EVENT_C
 
 The scaffold has **no** `data-impeccable-variant="original"`. Variants are net-new HTML+CSS inserted at `insertLine`. Load `brand.md` or `product.md` (freeform only, no action sub-command). Write all variants in one edit, then `--reply done`.
 
-On accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
+For Svelte/SvelteKit targets, `live-insert.mjs` returns `previewMode: "svelte-component"` with `mode: "insert"`, `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each inserted variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`. Insert variants must be non-empty net-new content with a single top-level root, no `data-impeccable-*` attributes, and CSS in each component's `<style>` block. Do **not** edit the route source during generation; the browser mounts the temporary component before/after the live anchor while the user cycles variants. On Accept, `live-accept.mjs` inserts the selected component markup into `sourceFile` immediately and deletes the temp session after the source write succeeds.
+
+For non-Svelte targets, on accept/discard, `live-accept.mjs` removes the wrapper block; the anchor element is untouched.
 
 ### Replace mode (default)
 
@@ -149,6 +151,25 @@ If `--text` matches multiple candidates equally well, wrap exits with `{ error:
 
 Output on success: `{ file, insertLine, commentSyntax, styleMode, styleTag, cssSelectorPrefixExamples, cssAuthoring }`.
 
+For Svelte/SvelteKit targets, `live-wrap.mjs` returns `previewMode: "svelte-component"` with `file` pointing at a temporary `node_modules/.impeccable-live/<id>/manifest.json`, `componentDir` pointing at the variant component files, and `sourceFile` pointing at the real `.svelte` route. Write each variant as a real Svelte component (`v1.svelte`, `v2.svelte`, …) under `componentDir`; use the `propContract` prop names for dynamic text (`{propName}`), not literal snapshot strings. Put variant CSS in each component's `<style>` block with semantic class selectors (no `@scope`, no `data-impeccable-*`). Reply with `--file` set to the manifest path; the browser dynamically imports and mounts the compiled components so Svelte HMR does not reset page state while the user cycles variants. On Accept, `live-accept.mjs` inlines the accepted component back into `sourceFile` immediately after source promotion succeeds.
+
+**Params on the Svelte component path go in a sidecar, never as an attribute.** Svelte parses `{` inside an attribute value as the start of an expression, so a `data-impeccable-params='[{…}]'` attribute on a component element fails to compile (`Expected token }`). Declare params for this path in `componentDir/params.json`, keyed by variant number, using the exact param schema from section 7:
+
+```json
+{
+  "1": [
+    {"id":"density","kind":"steps","default":"snug","label":"Density","options":[
+      {"value":"airy","label":"Airy"},{"value":"snug","label":"Snug"},{"value":"packed","label":"Packed"}
+    ]}
+  ],
+  "2": [
+    {"id":"accent","kind":"range","min":0,"max":1,"step":0.05,"default":0.5,"label":"Accent"}
+  ]
+}
+```
+
+Author the component `<style>` against `var(--p-<id>, default)` for `range`/`toggle` and `[data-p-<id>="…"]` for `steps`; wrap those selectors in `:global(...)` so the knob values the runtime sets on the mounted root reach your rules. The browser reads `params.json`, docks the panel, and drives `--p-*` / `data-p-*` on the mounted component exactly as it does for the HTML/JSX path.
+
 `styleMode` controls how preview CSS must be authored. Treat it as a detected capability mode, not a framework guess:
 
 - `scoped`: use `@scope ([data-impeccable-variant="N"])` rules.
@@ -340,7 +361,7 @@ Each variant can expose **coarse** knobs alongside the full HTML/CSS replacement
 
 **Hard cap per variant**: at most **four** parameters so the panel stays legible; rare fifth only if the reference explicitly allows it.
 
-**How to declare.** Put a JSON manifest on the variant wrapper:
+**How to declare.** Put a JSON manifest on the variant wrapper (HTML/JSX path). **On the Svelte `svelte-component` path, do not use this attribute** (Svelte can't compile `{` inside an attribute value). Declare params in `componentDir/params.json` keyed by variant number instead (see the Svelte component paragraph in the wrap section). The param schema below is identical for both paths.
 
 ```html
 <div data-impeccable-variant="1" data-impeccable-params='[
@@ -454,7 +475,7 @@ Do these five steps in the current thread, synchronously, before the next poll.
 1. **Locate the carbonize block** in the source file (`_acceptResult.file`). It's bracketed by `<!-- impeccable-carbonize-start SESSION_ID -->` and `<!-- impeccable-carbonize-end SESSION_ID -->` and contains a `<style data-impeccable-css="SESSION_ID">` element. If the variant declared parameters, an `<!-- impeccable-param-values SESSION_ID: {...} -->` comment sits alongside the style tag with the user's chosen values; read it first; it drives steps 3 and 4 below.
 2. **Move the CSS rules** into the project's real stylesheet. Which stylesheet depends on the project (e.g. `site/styles/workflow.css` for an Astro project, or the component's co-located CSS file for a Vite/Next project; pick whichever already owns styling for the surrounding element).
 3. **Bake in parameter values while rewriting selectors.** For `@scope ([data-impeccable-variant="N"])` wrappers: retarget to real, semantic classes on the accepted HTML (`.why-visual--v2 .v2-label { … }`). For `:scope[data-p-<id>="VALUE"]` selectors: keep only the branch matching the chosen value from the param-values comment; drop the others (they're dead after accept). For `var(--p-<id>, DEFAULT)` in the CSS: either substitute the literal value, or if the param is still useful as a knob going forward, leave the var and update its initial declaration to the chosen value.
-4. **Unwrap the accepted content.** Delete the `<div data-impeccable-variant="N" style="display: contents">` that wraps it. Drop `data-impeccable-params` and any `data-p-*` attributes from it; those are live-mode plumbing, not source.
+4. **Unwrap the accepted content.** Delete the inner `<div data-impeccable-variant="N" style="display: contents">` that wraps it. On JSX/TSX, also delete the outer `<div data-impeccable-carbonize="SESSION_ID" style={{ display: 'contents' }}>` wrapper if present (accept adds it so ternary/`return` slots keep a single root). Drop `data-impeccable-params` and any `data-p-*` attributes; those are live-mode plumbing, not source.
 5. **Delete the inline `<style>` block, the `<!-- impeccable-param-values -->` comment if present, and both `<!-- impeccable-carbonize-start/end -->` markers.** Also drop any `@scope` rules for variants other than the accepted one; those are dead code now.
 
 After the file is clean, run `live-complete.mjs --id SESSION_ID`, verify it reports `phase: "completed"`, then poll again.

.pi/skills/impeccable/scripts/live-accept.mjs

@@ -17,6 +17,12 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { isGeneratedFile } from './is-generated.mjs';
 import { readBuffer as readManualEditsBuffer, writeBuffer as writeManualEditsBuffer } from './live-manual-edits-buffer.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  findSvelteComponentManifest,
+  inlineSvelteComponentAccept,
+  removeSvelteComponentSession,
+} from './live-svelte-component.mjs';
 
 const EXTENSIONS = ['.html', '.jsx', '.tsx', '.vue', '.svelte', '.astro'];
 
@@ -41,6 +47,9 @@ Required:
 
 Options:
   --page-url URL     Current browser page URL; scopes staged copy-edit cleanup
+  --defer-source-write
+                     Deprecated compatibility flag. Svelte component accepts
+                     now write the real source immediately.
 
 Output (JSON):
   { handled, file, carbonize }`);
@@ -64,18 +73,67 @@ Output (JSON):
 
   // Find the file containing this session's markers
   const found = findSessionFile(id, process.cwd());
-  if (!found) {
+  const svelteComponentManifest = found ? null : findSvelteComponentManifest(id, process.cwd());
+
+  if (!found && !svelteComponentManifest) {
     console.log(JSON.stringify({ handled: false, error: 'Session markers not found for id: ' + id }));
     process.exit(0);
   }
 
+  if (svelteComponentManifest) {
+    if (isDiscard) {
+      removeSvelteComponentSession(id, process.cwd());
+      console.log(JSON.stringify({
+        handled: true,
+        file: svelteComponentManifest.sourceFile,
+        carbonize: false,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      }));
+      return;
+    }
+
+    let result;
+    try {
+      result = inlineSvelteComponentAccept(
+        svelteComponentManifest,
+        variantNum,
+        paramValues,
+        process.cwd(),
+      );
+    } catch (err) {
+      result = {
+        handled: false,
+        error: err.message,
+        file: svelteComponentManifest.sourceFile,
+        sourceFile: svelteComponentManifest.sourceFile,
+        previewMode: 'svelte-component',
+        componentDir: svelteComponentManifest.componentDir,
+      };
+    }
+    if (result.carbonize) {
+      result.todo = 'REQUIRED before next poll: carbonize cleanup in ' + result.file + '. See reference/live.md "Required after accept".';
+    }
+    console.log(JSON.stringify({ handled: result.handled !== false, ...result }));
+    return;
+  }
+
   const { file: targetFile, content, lines } = found;
   const relFile = path.relative(process.cwd(), targetFile);
+  const previewBlock = findMarkerBlock(id, lines);
+  const sourceShadowPreview = previewBlock
+    ? readSourceShadowPreviewMeta(content, id)
+    : null;
+
+  if (sourceShadowPreview) {
+    console.log(JSON.stringify({
+      handled: false,
+      error: 'source_shadow_preview_deprecated',
+      hint: 'Svelte live mode now uses svelte-component injection. Re-wrap the element and regenerate variants.',
+    }));
+    process.exit(0);
+  }
 
-  // Bail if the session lives in a generated file. The agent manually wrote
-  // the wrapper there for preview, and is responsible for writing the
-  // accepted variant to true source (or cleaning up on discard). See
-  // "Handle fallback" in live.md.
   if (isGeneratedFile(targetFile, { cwd: process.cwd() })) {
     console.log(JSON.stringify({
       handled: false,
@@ -207,6 +265,71 @@ function handleDiscard(id, lines, targetFile) {
 // Accept
 // ---------------------------------------------------------------------------
 
+/**
+ * Build carbonize stitch-in lines. JSX targets occupy a single child slot
+ * (ternary branch, return value, etc.) — the same constraint as live-wrap.
+ * When isJsx, tuck markers + <style> + variant wrapper inside one outer
+ * <div data-impeccable-carbonize> so the slot keeps a single root node.
+ */
+function buildCarbonizeReplacement({
+  indent,
+  commentSyntax,
+  isJsx,
+  id,
+  variantNum,
+  cssContent,
+  paramValues,
+  restored,
+}) {
+  const lines = [];
+  if (!cssContent) {
+    lines.push(...restored);
+    return lines;
+  }
+
+  const variantStyleAttr = isJsx
+    ? "style={{ display: 'contents' }}"
+    : 'style="display: contents"';
+
+  const pushCarbonizeBody = (bodyIndent) => {
+    const bodyRestored = reindentContent(restored, indent, bodyIndent + '  ');
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    for (const cssLine of cssContent) {
+      lines.push(bodyIndent + cssLine.trimStart());
+    }
+    lines.push(bodyIndent + (isJsx ? '`}</style>' : '</style>'));
+    if (paramValues && Object.keys(paramValues).length > 0) {
+      lines.push(
+        bodyIndent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close,
+      );
+    }
+    lines.push(bodyIndent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
+    lines.push(bodyIndent + '<div data-impeccable-variant="' + variantNum + '" ' + variantStyleAttr + '>');
+    lines.push(...bodyRestored);
+    lines.push(bodyIndent + '</div>');
+  };
+
+  if (isJsx) {
+    const wrapperStyle = 'style={{ display: "contents" }}';
+    lines.push(indent + '<div data-impeccable-carbonize="' + id + '" ' + wrapperStyle + '>');
+    pushCarbonizeBody(indent + '  ');
+    lines.push(indent + '</div>');
+  } else {
+    pushCarbonizeBody(indent);
+  }
+
+  return lines;
+}
+
+function reindentContent(contentLines, fromIndent, toIndent) {
+  return contentLines.map((line) => {
+    if (line.trim() === '') return '';
+    if (line.startsWith(fromIndent)) return toIndent + line.slice(fromIndent.length);
+    return toIndent + line.trimStart();
+  });
+}
+
 function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const block = findMarkerBlock(id, lines);
   if (!block) return { handled: false, error: 'Markers not found' };
@@ -235,45 +358,17 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   const hasHelperAttrs = variantText.includes('data-impeccable-variant');
   const needsCarbonize = !!(cssContent || hasHelperAttrs);
 
-  // Build the replacement
   const restored = deindentContent(variantContent, indent);
-  const replacement = [];
+  const replacement = buildCarbonizeReplacement({
-
+    indent,
-  if (cssContent) {
+    commentSyntax,
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-start ' + id + ' ' + commentSyntax.close);
+    isJsx,
-    // JSX targets need the CSS body wrapped in a template literal so that the
+    id,
-    // `{` and `}` in CSS rules don't get parsed as JSX expressions.
+    variantNum,
-    replacement.push(indent + '<style data-impeccable-css="' + id + '">' + (isJsx ? '{`' : ''));
+    cssContent,
-    // Re-indent CSS content to match
+    paramValues,
-    for (const cssLine of cssContent) {
+    restored,
-      replacement.push(indent + cssLine.trimStart());
+  });
-    }
-    replacement.push(indent + (isJsx ? '`}</style>' : '</style>'));
-    if (paramValues && Object.keys(paramValues).length > 0) {
-      // Preserve the user's knob positions for the carbonize-cleanup agent
-      // to bake into the final CSS when it collapses scoped rules.
-      replacement.push(indent + commentSyntax.open + ' impeccable-param-values ' + id + ': ' + JSON.stringify(paramValues) + ' ' + commentSyntax.close);
-    }
-    replacement.push(indent + commentSyntax.open + ' impeccable-carbonize-end ' + id + ' ' + commentSyntax.close);
-  }
-
-  // Keep the `@scope ([data-impeccable-variant="N"])` selectors in the
-  // carbonize CSS block working visually by re-wrapping the accepted content
-  // in a data-impeccable-variant="N" div with `display: contents` (so layout
-  // isn't affected). The carbonize agent strips this attribute + wrapper when
-  // it moves the CSS to a proper stylesheet.
-  //
-  // Style attribute syntax has to follow the host file's flavor — JSX files
-  // need the object form, otherwise React 19 throws "Failed to set indexed
-  // property [0] on CSSStyleDeclaration" while parsing the string char-by-char.
-  if (cssContent) {
-    const styleAttr = isJsx ? "style={{ display: 'contents' }}" : 'style="display: contents"';
-    replacement.push(indent + '<div data-impeccable-variant="' + variantNum + '" ' + styleAttr + '>');
-    replacement.push(...restored);
-    replacement.push(indent + '</div>');
-  } else {
-    replacement.push(...restored);
-  }
 
   const newLines = [
     ...lines.slice(0, replaceRange.start),
@@ -285,6 +380,34 @@ function handleAccept(id, variantNum, lines, targetFile, paramValues) {
   return { carbonize: needsCarbonize, acceptedOriginalText: originalContent.join('\n') };
 }
 
+function readSourceShadowPreviewMeta(content, id) {
+  const escaped = escapeRegExp(id);
+  const wrapperRe = new RegExp('<[^>]+data-impeccable-variants=(["\'])' + escaped + '\\1[^>]*>');
+  const match = String(content || '').match(wrapperRe);
+  if (!match) return null;
+  const tag = match[0];
+  if (readHtmlAttr(tag, 'data-impeccable-preview') !== 'source-shadow') return null;
+  const sourceFile = readHtmlAttr(tag, 'data-impeccable-source-file');
+  const sourceStartLine = Number(readHtmlAttr(tag, 'data-impeccable-source-start'));
+  const sourceEndLine = Number(readHtmlAttr(tag, 'data-impeccable-source-end'));
+  if (!sourceFile || !Number.isFinite(sourceStartLine) || !Number.isFinite(sourceEndLine)) return null;
+  return { sourceFile, sourceStartLine, sourceEndLine };
+}
+
+function readHtmlAttr(tag, name) {
+  const match = String(tag || '').match(new RegExp('\\s' + escapeRegExp(name) + '\\s*=\\s*(["\'])(.*?)\\1'));
+  if (!match) return null;
+  return decodeHtmlAttr(match[2]);
+}
+
+function decodeHtmlAttr(value) {
+  return String(value || '')
+    .replace(/&quot;/g, '"')
+    .replace(/&lt;/g, '<')
+    .replace(/&gt;/g, '>')
+    .replace(/&amp;/g, '&');
+}
+
 // ---------------------------------------------------------------------------
 // Parsing helpers
 // ---------------------------------------------------------------------------
@@ -686,4 +809,4 @@ if (_running?.endsWith('live-accept.mjs') || _running?.endsWith('live-accept.mjs
   acceptCli();
 }
 
-export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock };
+export { findMarkerBlock, extractOriginal, extractVariant, extractCss, deindentContent, detectCommentSyntax, scrubManualEditsAgainstFile, scrubManualEditsAgainstOriginalBlock, applyDeferredSvelteComponentAccepts };

.pi/skills/impeccable/scripts/live-completion.mjs

@@ -3,6 +3,7 @@ export function completionTypeForAcceptResult(eventType, acceptResult) {
   if (acceptResult?.handled === true && acceptResult?.carbonize === true) return 'agent_done';
   if (acceptResult?.handled === true) return 'complete';
   if (acceptResult?.mode === 'error') return 'error';
+  if (eventType === 'accept' && acceptResult?.previewMode === 'svelte-component') return 'error';
   return 'agent_done';
 }
 

.pi/skills/impeccable/scripts/live-inject.mjs

@@ -17,11 +17,38 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { resolveLiveConfigPath } from './impeccable-paths.mjs';
+import {
+  applySvelteKitLiveAdapter,
+  detectSvelteKitProject,
+  removeSvelteKitLiveAdapter,
+} from './live-sveltekit-adapter.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const CONFIG_PATH = resolveLiveConfigPath({ cwd: process.cwd(), scriptsDir: __dirname });
 const MARKER_OPEN_TEXT = 'impeccable-live-start';
 const MARKER_CLOSE_TEXT = 'impeccable-live-end';
+const IGNORE_MARKER_OPEN = '# impeccable-live-ignore-start';
+const IGNORE_MARKER_CLOSE = '# impeccable-live-ignore-end';
+
+export const LIVE_IGNORE_PATTERNS = Object.freeze([
+  '.impeccable/hook.cache.json',
+  '.impeccable/live/server.json',
+  '.impeccable/live/sessions/',
+  '.impeccable/live/previews/',
+  '.impeccable/live/annotations/',
+  '.impeccable/live/cache/',
+  '.impeccable/live/manual-edit-apply-transaction.json',
+  '.impeccable/live/manual-edit-events.jsonl',
+  '.impeccable/live/manual-edit-evidence/',
+  '.impeccable/live/pending-manual-edits.json',
+  '.impeccable/live/deferred-svelte-component-accepts.json',
+  '.impeccable-live.json',
+  '.impeccable-live/',
+  'node_modules/.impeccable-live/',
+  'src/lib/impeccable/ImpeccableLiveRoot.svelte',
+  'src/lib/impeccable/__runtime.js',
+  'src/lib/impeccable/[0-9a-f]*/',
+]);
 
 /**
  * Hard-excluded directory patterns. These are NEVER user-facing pages and
@@ -83,8 +110,14 @@ Output (JSON):
   validateConfig(config);
 
   const resolvedFiles = resolveFiles(process.cwd(), config);
+  const svelteKit = detectSvelteKitProject(process.cwd(), config);
 
   if (args.includes('--remove')) {
+    if (svelteKit) {
+      const adapterResult = removeSvelteKitLiveAdapter({ cwd: process.cwd(), config });
+      console.log(JSON.stringify({ ok: true, adapter: 'sveltekit', results: [adapterResult] }));
+      return;
+    }
     const results = resolvedFiles.map((relFile) => {
       const absFile = path.resolve(process.cwd(), relFile);
       if (!fs.existsSync(absFile)) return { file: relFile, error: 'file_not_found' };
@@ -110,6 +143,13 @@ Output (JSON):
     console.error(JSON.stringify({ ok: false, error: 'missing_port' }));
     process.exit(1);
   }
+  const gitIgnore = ensureLiveGitIgnores(process.cwd());
+
+  if (svelteKit) {
+    const adapterResult = applySvelteKitLiveAdapter({ cwd: process.cwd(), port, config });
+    console.log(JSON.stringify({ ok: true, port, adapter: 'sveltekit', gitIgnore, results: [adapterResult] }));
+    return;
+  }
 
   const results = resolvedFiles.map((relFile) => {
     const absFile = path.resolve(process.cwd(), relFile);
@@ -129,10 +169,68 @@ Output (JSON):
     };
   });
   const anyInserted = results.some((r) => r.inserted);
-  console.log(JSON.stringify({ ok: anyInserted, port, results }));
+  console.log(JSON.stringify({ ok: anyInserted, port, gitIgnore, results }));
   if (!anyInserted) process.exit(1);
 }
 
+export function ensureLiveGitIgnores(cwd = process.cwd()) {
+  const target = resolveIgnoreTarget(cwd);
+  const existing = fs.existsSync(target.path) ? fs.readFileSync(target.path, 'utf-8') : '';
+  const block = [
+    IGNORE_MARKER_OPEN,
+    ...LIVE_IGNORE_PATTERNS,
+    IGNORE_MARKER_CLOSE,
+  ].join('\n');
+  const markerRe = new RegExp(`${escapeRegExp(IGNORE_MARKER_OPEN)}[\\s\\S]*?${escapeRegExp(IGNORE_MARKER_CLOSE)}`);
+
+  let updated;
+  if (markerRe.test(existing)) {
+    updated = existing.replace(markerRe, block);
+  } else {
+    const prefix = existing.length === 0 ? '' : existing.endsWith('\n') ? existing : existing + '\n';
+    updated = `${prefix}${prefix.endsWith('\n\n') || prefix === '' ? '' : '\n'}${block}\n`;
+  }
+
+  if (updated !== existing) {
+    fs.mkdirSync(path.dirname(target.path), { recursive: true });
+    fs.writeFileSync(target.path, updated, 'utf-8');
+  }
+
+  return {
+    file: path.relative(cwd, target.path).split(path.sep).join('/'),
+    mode: target.mode,
+    changed: updated !== existing,
+    patterns: [...LIVE_IGNORE_PATTERNS],
+  };
+}
+
+function resolveIgnoreTarget(cwd) {
+  const gitExcludePath = resolveGitInfoExcludePath(cwd);
+  if (gitExcludePath) {
+    return { path: gitExcludePath, mode: 'git-info-exclude' };
+  }
+  return { path: path.join(cwd, '.gitignore'), mode: 'gitignore' };
+}
+
+function resolveGitInfoExcludePath(cwd) {
+  const dotGit = path.join(cwd, '.git');
+  if (!fs.existsSync(dotGit)) return null;
+
+  const stat = fs.statSync(dotGit);
+  if (stat.isDirectory()) return path.join(dotGit, 'info', 'exclude');
+  if (!stat.isFile()) return null;
+
+  const body = fs.readFileSync(dotGit, 'utf-8').trim();
+  const match = body.match(/^gitdir:\s*(.+)$/i);
+  if (!match) return null;
+  const gitDir = path.isAbsolute(match[1]) ? match[1] : path.resolve(cwd, match[1]);
+  return path.join(gitDir, 'info', 'exclude');
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
 /**
  * Expand config.files (which may contain glob patterns) into a literal list
  * of existing file paths relative to rootDir. Literal entries pass through;

.pi/skills/impeccable/scripts/live-insert.mjs

@@ -21,6 +21,11 @@ import {
   buildCssAuthoring,
   buildCssSelectorPrefixExamples,
 } from './live-wrap.mjs';
+import {
+  buildSvelteComponentCssAuthoring,
+  scaffoldSvelteComponentInsertSession,
+  shouldUseSvelteComponentInjection,
+} from './live-svelte-component.mjs';
 
 const INSERT_POSITIONS = new Set(['before', 'after']);
 
@@ -192,6 +197,41 @@ Output (JSON):
   const styleMode = detectStyleMode(targetFile);
   const isJsx = commentSyntax.open === '{/*';
   const spliceIndex = computeInsertLine(startLine, endLine, position);
+  const relTargetFile = path.relative(process.cwd(), targetFile).split(path.sep).join('/');
+
+  if (shouldUseSvelteComponentInjection(targetFile)) {
+    const session = scaffoldSvelteComponentInsertSession({
+      id,
+      count,
+      sourceFile: relTargetFile,
+      insertLine: spliceIndex + 1,
+      position,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      anchorLines: lines.slice(startLine, endLine + 1),
+      cwd: process.cwd(),
+    });
+    console.log(JSON.stringify({
+      mode: 'insert',
+      position,
+      file: session.manifestFile,
+      sourceFile: relTargetFile,
+      previewMode: 'svelte-component',
+      componentDir: session.componentDir,
+      propContract: session.propContract,
+      insertLine: 1,
+      sourceInsertLine: spliceIndex + 1,
+      anchorStartLine: startLine + 1,
+      anchorEndLine: endLine + 1,
+      commentSyntax,
+      styleMode: 'svelte-component',
+      styleTag: null,
+      cssSelectorPrefixExamples: [],
+      cssAuthoring: buildSvelteComponentCssAuthoring(count),
+    }));
+    return;
+  }
+
   const indent = lines[spliceIndex]?.match(/^(\s*)/)?.[1]
     ?? lines[startLine]?.match(/^(\s*)/)?.[1]
     ?? '';
@@ -216,7 +256,7 @@ Output (JSON):
   console.log(JSON.stringify({
     mode: 'insert',
     position,
-    file: path.relative(process.cwd(), targetFile),
+    file: relTargetFile,
     insertLine: insertLine + 1,
     commentSyntax,
     styleMode: styleMode.mode,

.pi/skills/impeccable/scripts/live-poll.mjs

@@ -20,6 +20,7 @@ import { readLiveServerInfo } from './impeccable-paths.mjs';
 // that ceiling and loop in `pollOnce` to synthesize a long poll without
 // depending on the standalone undici package.
 export const PER_REQUEST_TIMEOUT_MS = 270_000;
+export const DEFAULT_EVENT_LEASE_MS = 600_000;
 
 const EVENT_TYPES_NEEDING_AGENT_REPLY = new Set(['generate', 'steer', 'manual_edit_apply']);
 
@@ -156,7 +157,7 @@ export async function fetchNextEvent(base, token, { totalDeadline } = {}) {
       ? totalDeadline - Date.now()
       : PER_REQUEST_TIMEOUT_MS;
     const slice = Math.min(Math.max(remaining, 1000), PER_REQUEST_TIMEOUT_MS);
-    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}`);
+    const res = await fetch(`${base}/poll?token=${token}&timeout=${slice}&leaseMs=${DEFAULT_EVENT_LEASE_MS}`);
 
     if (res.status === 401) {
       const err = new Error('Authentication failed. The server token may have changed.');
@@ -317,7 +318,7 @@ Modes:
 Options:
   --timeout=MS        One-shot poll timeout in ms (default: 600000). Ignored in --stream mode
   --ack-timeout=MS    Stream mode: max wait for --reply after generate/steer (default: 600000)
-  --file PATH         Attach a source file path to the reply (generate flow)
+  --file PATH         Attach a source file path to the reply (generate/steer flow)
   --data JSON         Attach a JSON result object to the reply (manual_edit_apply flow). Must be valid JSON
   --help              Show this help message
 

.pi/skills/impeccable/scripts/live-server.mjs

@@ -42,6 +42,10 @@ import {
 } from './live-manual-edits-buffer.mjs';
 import { buildManualEditEvidence } from './live-manual-edit-evidence.mjs';
 import { commitManualEdits } from './live-commit-manual-edits.mjs';
+import {
+  applyDeferredSvelteComponentAccepts,
+  removeAllSvelteComponentSessions,
+} from './live-svelte-component.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 // PRODUCT.md / DESIGN.md live wherever context.mjs resolves. The generated
@@ -103,6 +107,7 @@ const MIN_MANUAL_EDIT_APPLY_CHUNK_SIZE = 1;
 const MAX_MANUAL_EDIT_APPLY_CHUNK_SIZE = 20;
 const MANUAL_APPLY_COMPACT_TEXT_LIMIT = 240;
 const MANUAL_APPLY_COMPACT_NEARBY_LIMIT = 4;
+const POLL_LEASE_EXPIRY_TIMER_GRACE_MS = 2;
 const DEBUG_MANUAL_EDIT_EVENTS = /^(1|true|yes)$/i.test(process.env.IMPECCABLE_LIVE_DEBUG_EVENTS || '');
 
 function tombstoneTimedOutApplyId(eventId, details = {}) {
@@ -897,6 +902,8 @@ function leaseEvent(entry, leaseMs) {
     return entry.event;
   }
   entry.leaseUntil = Date.now() + leaseMs;
+  scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return entry.event;
 }
 
@@ -907,9 +914,16 @@ function acknowledgePendingEvent(id) {
   const acknowledged = state.pendingEvents[idx].event;
   state.pendingEvents.splice(idx, 1);
   scheduleLeaseFlush();
+  broadcastAgentPollingIfChanged();
   return acknowledged;
 }
 
+function findPendingEventById(id) {
+  if (!id) return null;
+  const entry = state.pendingEvents.find((item) => item.event?.id === id);
+  return entry?.event || null;
+}
+
 function manualApplyReplyCommand(eventOrId = 'EVENT_ID') {
   const id = typeof eventOrId === 'string' ? eventOrId : eventOrId?.id || 'EVENT_ID';
   return `live-poll.mjs --reply ${id} done --data '<json>'`;
@@ -955,6 +969,42 @@ function summarizePendingEventForStatus(entry) {
   return summary;
 }
 
+function summarizeActiveSessionForClient(snapshot = {}) {
+  return {
+    id: snapshot.id,
+    phase: snapshot.phase,
+    pageUrl: snapshot.pageUrl ?? null,
+    sourceFile: snapshot.sourceFile ?? null,
+    previewFile: snapshot.previewFile ?? null,
+    previewMode: snapshot.previewMode ?? null,
+    expectedVariants: snapshot.expectedVariants ?? 0,
+    arrivedVariants: snapshot.arrivedVariants ?? 0,
+    visibleVariant: snapshot.visibleVariant ?? null,
+    checkpointRevision: snapshot.checkpointRevision ?? 0,
+    paramValues: snapshot.paramValues || {},
+  };
+}
+
+function activeSessionSummaries() {
+  if (!state.sessionStore) return [];
+  return state.sessionStore.listActiveSessions().map((snapshot) => summarizeActiveSessionForClient(snapshot));
+}
+
+function cancelQueuedAnonymousExitEvents() {
+  let removed = 0;
+  for (let i = state.pendingEvents.length - 1; i >= 0; i -= 1) {
+    const event = state.pendingEvents[i]?.event;
+    if (event?.type !== 'exit' || event.id) continue;
+    state.pendingEvents.splice(i, 1);
+    removed += 1;
+  }
+  if (removed > 0) {
+    scheduleLeaseFlush();
+    broadcastAgentPollingIfChanged();
+  }
+  return removed;
+}
+
 function cancelPendingManualApplyEvents(pageUrl, reason = 'manual_edit_discarded') {
   const canceledById = new Map();
   const shouldCancel = (event) => event?.type === 'manual_edit_apply' && (!pageUrl || event.pageUrl === pageUrl);
@@ -1001,7 +1051,6 @@ function scheduleLeaseFlush() {
     clearTimeout(state.leaseTimer);
     state.leaseTimer = null;
   }
-  if (state.pendingPolls.length === 0) return;
   const now = Date.now();
   const nextLeaseUntil = state.pendingEvents
     .map((entry) => entry.leaseUntil || 0)
@@ -1011,7 +1060,8 @@ function scheduleLeaseFlush() {
   state.leaseTimer = setTimeout(() => {
     state.leaseTimer = null;
     flushPendingPolls();
-  }, Math.max(0, nextLeaseUntil - now));
+    broadcastAgentPollingIfChanged();
+  }, Math.max(0, nextLeaseUntil - now + POLL_LEASE_EXPIRY_TIMER_GRACE_MS));
 }
 
 function flushPendingPolls() {
@@ -1032,7 +1082,9 @@ function flushPendingPolls() {
 }
 
 function agentPollingConnected() {
-  return state.pendingPolls.length > 0;
+  const now = Date.now();
+  return state.pendingPolls.length > 0
+    || state.pendingEvents.some((entry) => entry.leaseUntil && entry.leaseUntil > now);
 }
 
 function broadcastAgentPollingIfChanged() {
@@ -1318,7 +1370,7 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/status') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401, { 'Content-Type': 'application/json' }); res.end(JSON.stringify({ error: 'Unauthorized' })); return; }
-      const sessions = state.sessionStore ? state.sessionStore.listActiveSessions() : [];
+      const sessions = activeSessionSummaries();
       res.writeHead(200, { 'Content-Type': 'application/json' });
       res.end(JSON.stringify({
         status: 'ok',
@@ -1423,6 +1475,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
     if (p === '/events' && req.method === 'GET') {
       const token = url.searchParams.get('token');
       if (token !== state.token) { res.writeHead(401); res.end('Unauthorized'); return; }
+      clearTimeout(state.exitTimer);
+      state.exitTimer = null;
+      cancelQueuedAnonymousExitEvents();
       res.writeHead(200, {
         'Content-Type': 'text/event-stream',
         'Cache-Control': 'no-cache',
@@ -1432,10 +1487,10 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
         type: 'connected',
         hasProjectContext: hasProjectContext(),
         agentPolling: agentPollingConnected(),
+        activeSessions: activeSessionSummaries(),
       }) + '\n\n');
 
       state.sseClients.add(res);
-      clearTimeout(state.exitTimer);
 
       // Keepalive: SSE comment every 30s prevents silent connection drops.
       const heartbeat = setInterval(() => {
@@ -1827,6 +1882,9 @@ function createRequestHandler({ detectScript, sessionPath, livePath }) {
             return;
           }
         }
+        if (msg.type === 'exit') {
+          cleanupSvelteComponentSessionsBeforeExit();
+        }
         if (msg.type !== 'checkpoint') {
           enqueueEvent(msg);
         }
@@ -1905,6 +1963,36 @@ function handlePollGet(req, res, url) {
   });
 }
 
+function sessionFileMetadataFromPollReply(file) {
+  if (!file || typeof file !== 'string') return { file };
+  const normalized = file.split(path.sep).join('/');
+  const base = { file: normalized };
+  if (!normalized.endsWith('/manifest.json') && normalized !== 'manifest.json') return base;
+  if (!normalized.includes('node_modules/.impeccable-live/') && !normalized.includes('src/lib/impeccable/')) return base;
+
+  let full;
+  try {
+    full = path.resolve(process.cwd(), normalized);
+    const rel = path.relative(process.cwd(), full);
+    if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) return base;
+  } catch {
+    return base;
+  }
+
+  try {
+    const manifest = JSON.parse(fs.readFileSync(full, 'utf-8'));
+    if (manifest?.previewMode !== 'svelte-component' || !manifest.sourceFile) return base;
+    return {
+      file: String(manifest.sourceFile).split(path.sep).join('/'),
+      sourceFile: String(manifest.sourceFile).split(path.sep).join('/'),
+      previewFile: normalized,
+      previewMode: 'svelte-component',
+    };
+  } catch {
+    return base;
+  }
+}
+
 function handlePollPost(req, res) {
   let body = '';
   req.on('data', (c) => { body += c; });
@@ -1965,6 +2053,16 @@ function handlePollPost(req, res) {
       res.end(JSON.stringify({ error: 'stale_manual_edit_apply_reply', ...rollback }));
       return;
     }
+    const pendingEventBeforeAck = findPendingEventById(msg.id);
+    if (pendingEventBeforeAck?.type === 'steer' && msg.type === 'steer_done'
+        && !msg.file && !(typeof msg.message === 'string' && msg.message.trim())) {
+      res.writeHead(400, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({
+        error: 'steer_done_requires_file_or_message',
+        hint: 'Reply with --file after writing source, or include a message explaining an intentional no-op.',
+      }));
+      return;
+    }
     const acknowledgedEvent = acknowledgePendingEvent(msg.id);
     let skipJournalReply = false;
     let existingSession = null;
@@ -1987,6 +2085,7 @@ function handlePollPost(req, res) {
       }));
       return;
     }
+    const replyFileMeta = sessionFileMetadataFromPollReply(msg.file);
     if (state.sessionStore && msg.id && !skipJournalReply) {
       try {
         const eventType = msg.type === 'steer_done'
@@ -2001,7 +2100,10 @@ function handlePollPost(req, res) {
         state.sessionStore.appendEvent({
           type: eventType,
           id: msg.id,
-          file: msg.file,
+          file: replyFileMeta.file,
+          sourceFile: replyFileMeta.sourceFile,
+          previewFile: replyFileMeta.previewFile,
+          previewMode: replyFileMeta.previewMode,
           message: msg.message,
           sourceEventType: acknowledgedEvent?.type,
           carbonize: msg.data?.carbonize === true,
@@ -2010,7 +2112,16 @@ function handlePollPost(req, res) {
     }
     flushPendingPolls();
     // Forward the reply to the browser via SSE
-    broadcast({ type: msg.type || 'done', id: msg.id, message: msg.message, file: msg.file, data: msg.data });
+    broadcast({
+      type: msg.type || 'done',
+      id: msg.id,
+      message: msg.message,
+      file: msg.file,
+      sourceFile: replyFileMeta.sourceFile,
+      previewFile: replyFileMeta.previewFile,
+      previewMode: replyFileMeta.previewMode,
+      data: msg.data,
+    });
     res.writeHead(200, { 'Content-Type': 'application/json' });
     res.end(JSON.stringify({ ok: true }));
   });
@@ -2023,6 +2134,7 @@ function handlePollPost(req, res) {
 let httpServer = null;
 
 function shutdown() {
+  cleanupSvelteComponentSessionsBeforeExit();
   removeLiveServerInfo(process.cwd());
   if (state.leaseTimer) clearTimeout(state.leaseTimer);
   state.leaseTimer = null;
@@ -2037,6 +2149,25 @@ function shutdown() {
   process.exit(0);
 }
 
+function cleanupSvelteComponentSessionsBeforeExit() {
+  try {
+    removeAllSvelteComponentSessions(process.cwd());
+  } catch (err) {
+    console.warn('[impeccable] Svelte component session cleanup failed:', err.message);
+  }
+}
+
+function applyLegacyDeferredAcceptsOnStartup() {
+  try {
+    const result = applyDeferredSvelteComponentAccepts(process.cwd());
+    if (result.applied > 0 || result.failed > 0) {
+      console.log('[impeccable] applied legacy deferred Svelte component accepts:', JSON.stringify(result));
+    }
+  } catch (err) {
+    console.warn('[impeccable] legacy deferred Svelte component accept apply failed:', err.message);
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Main
 // ---------------------------------------------------------------------------
@@ -2162,6 +2293,7 @@ rollbackManualApplyTransaction({
   cwd: process.cwd(),
   reason: 'manual_edit_server_start_recovered_abandoned_transaction',
 });
+applyLegacyDeferredAcceptsOnStartup();
 restorePendingEventsFromStore();
 pruneStaleManualApplyEvidence(process.cwd());
 const portArg = args.find(a => a.startsWith('--port='));