Move generated browser script to .claude/skills/critique/scripts/

The generated browser detector now lives alongside the CLI script in
.claude/skills/critique/scripts/ — clearly a build artifact, not a
hand-maintained source file in public/js/.

- build-browser-detector.js outputs to .claude/ instead of public/js/
- Dev server serves .claude/skills/* for local testing
- All fixture and antipattern-example HTML files updated to new path
- Puppeteer detectUrl reads browser script from same directory
- Browser parity test server updated to serve from .claude/
- Deleted public/js/detect-antipatterns-browser.js

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/index.js

@@ -19,6 +19,19 @@ const server = serve({
     "/cheatsheet": cheatsheet,
     "/gallery": gallery,
 
+    // Built skill scripts (.claude/skills/)
+    "/.claude/skills/*": async (req) => {
+      const url = new URL(req.url);
+      if (url.pathname.includes('..')) return new Response("Bad Request", { status: 400 });
+      const filePath = `.${url.pathname}`;
+      const assetFile = file(filePath);
+      if (await assetFile.exists()) {
+        return new Response(assetFile, {
+          headers: { "Content-Type": "application/javascript", "X-Content-Type-Options": "nosniff" }
+        });
+      }
+      return new Response("Not Found", { status: 404 });
+    },
     // Static assets - all public subdirectories
     "/assets/*": async (req) => {
       const url = new URL(req.url);