Live: polling rework, source locks, preflight scaffolding, Vue previews

Carved out of #371, minus progressive publication. Everything here works
against real project source the way main's Live already does: the agent
writes variants into the file the browser loaded, HMR fires, Accept
promotes and carbonizes. Nothing is staged anywhere.

Poll lanes. Events now carry an explicit priority: accept/discard/exit
ahead of manual_edit_apply/steer/carbonize_cleanup ahead of generate. A
long generate can no longer sit in front of the Accept the user just
clicked. leaseEvent claims its lease before awaiting, so a slow prepare
cannot hand the same event to two pollers.

Source locks. A per-file mutex around every accept and discard path, keyed
on a digest of the absolute path. Staleness is decided by owner-pid
liveness rather than mtime, so a wedged lock clears when its owner dies
instead of after an arbitrary timeout, and a slow-but-live accept is never
stolen from. Only the owning process can release a lock.

Preflight scaffolding. The server runs live-wrap (or live-insert) before
the poll returns and hands the result back as event.scaffold. That walk is
measured at ~7.6s on a large repo; moving it off the agent's critical path
removes a deterministic tool round trip without touching the generated
design. Falls back cleanly to the agent running the helper itself.

Vue previews. previewMode: "vue-component" for Nuxt/Vue targets, matching
the existing Svelte component path: variants compile as real SFCs from a
dev-only directory so the route is never rewritten during generation, and
Vite mounts them without invalidating page state. Accept is the only route
write. Includes a Vue attr tokenizer that normalizes shorthand bindings
(@x, :x, #x) to their canonical forms.

Accept hardening. Every thrown failure now returns mode: 'error' rather
than an ambiguous unhandled result, so a real failure is never classified
as a deliberate manual handoff and silently dropped. The marker search
skips node_modules/.git/dist/build/.impeccable.

Shared CLI arg parsing extracted to scripts/lib/cli-args.mjs.

Assisted-by: Claude Code

skill/scripts/hook-admin.mjs

@@ -13,8 +13,6 @@
  *   node hook-admin.mjs ignore-file <glob>             # append to ignoreFiles
  *   node hook-admin.mjs ignore-value <rule> <value>    # append to shared ignoreValues
  *   node hook-admin.mjs ignore-value <rule> <value> --local
- *   node hook-admin.mjs ignore-value <rule> "*" --file <glob>   # rule off in <glob> only
- *   node hook-admin.mjs ignore-value <rule> "*"                 # refused: scope it or use ignore-rule
  *   node hook-admin.mjs reset                          # remove all config + cache
  *
  * Designed to be invoked by the LLM from the reference/hooks.md flow.
@@ -536,13 +534,12 @@ function addIgnoreFile(cwd, glob) {
 
 function parseIgnoreValueArgs(args) {
   const positionals = [];
-  const files = [];
   let shared = false;
   let local = false;
   let reason = '';
 
   for (let i = 0; i < args.length; i++) {
-    const arg = String(args[i] || '');
+    const arg = args[i];
     if (arg === '--shared') {
       shared = true;
     } else if (arg === '--local') {
@@ -553,20 +550,8 @@ function parseIgnoreValueArgs(args) {
         chunks.push(args[++i]);
       }
       reason = chunks.join(' ').trim();
-    } else if (arg.startsWith('--reason=')) {
-      reason = arg.slice('--reason='.length).trim();
-    } else if (arg === '--file' || arg === '--files') {
-      if (i + 1 >= args.length) throw new Error(`${arg} requires a glob`);
-      files.push(String(args[++i]).trim());
-    } else if (arg.startsWith('--file=')) {
-      files.push(arg.slice('--file='.length).trim());
-    } else if (arg.startsWith('--files=')) {
-      files.push(arg.slice('--files='.length).trim());
-    } else if (arg.startsWith('--')) {
-      // Otherwise a typo folds into the value: `ignore-value overused-font Inter
-      // --shard` stored the value "inter --shard", which matches no finding, and
-      // reported success. Matches `impeccable ignores add-value`.
-      throw new Error(`Unknown ignore-value flag: ${arg}`);
+    } else if (String(arg).startsWith('--reason=')) {
+      reason = String(arg).slice('--reason='.length).trim();
     } else {
       positionals.push(arg);
     }
@@ -576,7 +561,6 @@ function parseIgnoreValueArgs(args) {
   return {
     rule: String(rule || '').trim().toLowerCase(),
     value: normalizeIgnoreValue(valueParts.join(' ')),
-    files: Array.from(new Set(files.filter(Boolean))),
     shared,
     local,
     reason,
@@ -593,19 +577,10 @@ function addIgnoreValue(cwd, args) {
     throw new Error('Pass only one scope flag: --shared or --local');
   }
 
-  // A bare `*` would suppress the rule everywhere, which is ignore-rule's job and
-  // not what a finding in one file justifies. detector.ignoreValues honours a
-  // `files` scope, so require one — matching `impeccable ignores add-value`.
-  if (parsed.value === '*' && parsed.files.length === 0) {
-    throw new Error(`Wildcard value ignores must be scoped with --file <glob>, e.g. ${IMPECCABLE_COMMAND} hooks ignore-value design-system-font-size "*" --file "src/widget.js". To suppress the rule project-wide use ${IMPECCABLE_COMMAND} hooks ignore-rule ${parsed.rule}.`);
-  }
-
   const local = parsed.local;
   const config = mergeDetectorConfig(readRawDetectorConfig(cwd, { local }));
-  // Key on the file scope too: the same rule/value legitimately appears more than
-  // once with different scopes, and a rule+value-only key overwrote them.
-  const key = ignoreValueEntryKey({ rule: parsed.rule, value: parsed.value, files: parsed.files });
-  const existing = config.ignoreValues.find((entry) => ignoreValueEntryKey(entry) === key);
+  const key = `${parsed.rule}\0${parsed.value}`;
+  const existing = config.ignoreValues.find((entry) => `${entry.rule}\0${entry.value}` === key);
 
   if (existing) {
     if (parsed.reason) existing.reason = parsed.reason;
@@ -613,17 +588,15 @@ function addIgnoreValue(cwd, args) {
     const entry = {
       rule: parsed.rule,
       value: parsed.value,
+      createdAt: new Date().toISOString(),
     };
-    if (parsed.files.length) entry.files = parsed.files;
-    entry.createdAt = new Date().toISOString();
     if (parsed.reason) entry.reason = parsed.reason;
     config.ignoreValues.push(entry);
   }
 
   const target = writeDetectorConfig(cwd, config, { local });
   const scope = local ? 'local detector.ignoreValues' : 'shared detector.ignoreValues';
-  const scopeSuffix = parsed.files.length ? ` scoped to ${parsed.files.join(', ')}` : '';
-  return `Added ${parsed.rule}=${parsed.value}${scopeSuffix} to ${scope} (${path.relative(cwd, target) || target}).`;
+  return `Added ${parsed.rule}=${parsed.value} to ${scope} (${path.relative(cwd, target) || target}).`;
 }
 
 function reset(cwd) {