feat(detector): deprecate --fast (now a no-op, full scan always)

Since the jsdom removal the static HTML/CSS analysis is fast (~4ms/file) and
covers every rule, so the regex-only `--fast` path only loses coverage (it
ran ~10 of 41 rules) for no real speed win. It's a foot-gun: a `--fast` scan
can read "clean" because most rules silently don't run.

Deprecate gracefully rather than hard-remove: the flag is still accepted (so
existing CI scripts don't break) but ignored, with a one-line stderr notice,
and the full scan always runs. Dropped from --help and the example. Removed
the `--fast` suggestion from the many-files warning and from critique.md's
scan guidance.

Ships to users via a CLI release (npm) and rides the next skill release in
the bundled detector. Tests updated to assert the deprecation behavior.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.opencode/skills/impeccable/reference/critique.md

@@ -50,12 +50,12 @@ Run the bundled detector and browser visualization evidence. Assessment B is man
 
 CLI scan:
 ```bash
-node .opencode/skills/impeccable/scripts/detect.mjs --json [--fast] [target]
+node .opencode/skills/impeccable/scripts/detect.mjs --json [target]
 ```
 
 - Pass markup files/directories as `[target]`; do not pass CSS-only files.
 - For URLs, skip CLI scan and use browser visualization.
-- For 200+ scannable files, use `--fast`; for 500+, narrow scope or ask.
+- For very large trees (500+ scannable files), narrow scope or ask.
 - Exit code 0 = clean; 2 = findings.
 - If the detector entrypoint is missing or fails to load, report deterministic scan unavailable and continue with browser/manual review.
 

.opencode/skills/impeccable/scripts/detector/cli/main.mjs

@@ -79,7 +79,6 @@ function printUsage() {
 Scan files or URLs for UI anti-patterns and design quality issues.
 
 Options:
-  --fast    Regex-only mode (skip static HTML/CSS analysis, faster but misses linked stylesheets)
   --json    Output results as JSON
   --gpt     Also report GPT-specific provider tells (off by default)
   --gemini  Also report Gemini-specific provider tells (off by default)
@@ -89,13 +88,12 @@ Detection modes:
   HTML files     Static HTML/CSS analysis (default, catches linked CSS)
   Non-HTML files Regex pattern matching (CSS, JSX, TSX, etc.)
   URLs           Puppeteer full browser rendering (auto-detected)
-  --fast         Forces regex for all files
 
 Examples:
   impeccable detect src/
   impeccable detect index.html
   impeccable detect https://example.com
-  impeccable detect --fast --json .`);
+  impeccable detect --json .`);
 }
 
 async function detectCli() {
@@ -107,7 +105,15 @@ async function detectCli() {
   if (args[0] === 'detect') args = args.slice(1);
   const jsonMode = args.includes('--json');
   const helpMode = args.includes('--help');
-  const fastMode = args.includes('--fast');
+  // --fast (regex-only) is deprecated: since the jsdom removal, the static
+  // HTML/CSS analysis is fast and covers every rule, so the regex-only path
+  // only loses coverage for no real speed win. Accept the flag for back-compat
+  // but ignore it and run the full scan.
+  if (args.includes('--fast')) {
+    process.stderr.write(
+      'Note: --fast is deprecated and ignored. The full scan is fast now and runs every rule.\n',
+    );
+  }
   const providers = [];
   if (args.includes('--gpt')) providers.push('gpt');
   if (args.includes('--gemini')) providers.push('gemini');
@@ -177,7 +183,7 @@ async function detectCli() {
             process.stderr.write(
               `\nFound ${files.length} files (${htmlCount} HTML) in ${target}.\n` +
               `Scanning may take a while${htmlCount > 10 ? ' (static HTML/CSS processes each HTML file individually)' : ''}.\n` +
-              `Use --fast to skip static HTML/CSS analysis, or target a specific subdirectory.\n`
+              `Target a specific subdirectory to narrow scope.\n`
             );
             const ok = await confirm('Continue?');
             if (!ok) { process.stderr.write('Aborted.\n'); process.exit(0); }
@@ -197,7 +203,7 @@ async function detectCli() {
           for (const file of files) {
             const ext = path.extname(file).toLowerCase();
             let fileFindings;
-            if (!fastMode && HTML_EXTENSIONS.has(ext)) {
+            if (HTML_EXTENSIONS.has(ext)) {
               fileFindings = await detectHtml(file, scanOptions);
             } else {
               fileFindings = detectText(fs.readFileSync(file, 'utf-8'), file, scanOptions);
@@ -214,7 +220,7 @@ async function detectCli() {
           }
         } else if (stat.isFile()) {
           const ext = path.extname(resolved).toLowerCase();
-          if (!fastMode && HTML_EXTENSIONS.has(ext)) {
+          if (HTML_EXTENSIONS.has(ext)) {
             allFindings.push(...await detectHtml(resolved, scanOptions));
           } else {
             allFindings.push(...detectText(fs.readFileSync(resolved, 'utf-8'), resolved, scanOptions));