Claude Code: Update Cain status - verify runtime environment

- Import paths already fixed in previous commits
- error_handlers.py uses correct pattern: import openclaw → from agents import brain_minimal
- sys.path setup works via openclaw/__init__.py

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

openclaw/.openclaw/agents/cain_status.json

@@ -1,7 +1,5 @@
 {
   "current_state": "idle",
-  "last_updated": "2026-03-16T02:52:55.000000+00:00",
-  "agent": "cain",
-  "stage": "RUNNING",
-  "status": "A2A endpoint enabled - system woke up"
+  "last_updated": "2026-03-16T05:08:52.143596+00:00",
+  "agent": "cain"
 }