fix: strip ANSI codes before Vite ready detection in UVM smoke script

GitHub Actions sets FORCE_COLOR=1, which makes Vite output ANSI escape
codes (bold) around the port number in the 'Local: http://...' line:
  http://127.0.0.1:\e[1m43173\e[22m/

This broke the text.includes(baseUrl) check — 'http://127.0.0.1:43173'
never matched, so the script always timed out after 45s.

Fix: strip ANSI sequences with /\x1b\[[0-9;]*m/g before matching.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: thomasahle

scripts/repro-uvm-browser-worker-assert.mjs

@@ -185,7 +185,10 @@ function startViteDevServer(baseUrl, port) {
     const onData = (buf) => {
       const text = String(buf);
       output += text;
-      if (!ready && text.includes('Local:') && text.includes(baseUrl)) {
+      // Strip ANSI escape codes before matching — GitHub Actions sets FORCE_COLOR=1
+      // which makes Vite bold the port number: `http://127.0.0.1:\e[1m43173\e[22m/`
+      const plain = text.replace(/\x1b\[[0-9;]*m/g, '');
+      if (!ready && plain.includes('Local:') && plain.includes(baseUrl)) {
         ready = true;
         clearTimeout(timer);
         resolve();