fix: validate local Chrome probe

[ShiroKSH]

Summary

• Validate the response from the local DevTools endpoint before treating it as Chrome.
• Cover invalid HTTP payloads and a valid DevTools WebSocket response.

Root cause

Any HTTP 200 response on ports 9222 or 9223 blocked cloud auto-bootstrap, even when the service was not a CDP browser.

Checks

• uv run --with pytest pytest tests/unit/test_run.py -q
• git diff --check

---

Summary by cubic

Validate the local DevTools endpoint before treating it as Chrome by checking /json/version for a non-empty webSocketDebuggerUrl. Fixes false positives from services on ports 9222/9223 that blocked cloud auto-bootstrap.

• Bug Fixes
  • Parse JSON from /json/version; require webSocketDebuggerUrl to be a non-empty string.
  • Ignore non-JSON or invalid payloads; catch OSError, TypeError, and ValueError.
  • Add unit tests to reject invalid responses and accept a valid DevTools response.

^{Written for commit fdf433c. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}