QA PASSED - 5/5 checks:
1. status_200: PASS (257ms)
2. response_time_under_5s: PASS (270ms)
3. text_contains (Agent Control Center): PASS
4. json_api (/api/cc/templates): PASS
5. no_redirect: PASS
Real execution on mac-mini-01, Supabase task 20cfcd65