Claude Code: Update cain_status timestamp - mark A2A as enabled

- Update last_updated to current timestamp
- Add stage: RUNNING and status: A2A endpoint enabled
- Reflects the fix for A2A communication

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

openclaw/.openclaw/agents/cain_status.json

@@ -1,5 +1,7 @@
 {
   "current_state": "idle",
-  "last_updated": "2026-03-15T05:12:05.489475+00:00",
-  "agent": "cain"
+  "last_updated": "2026-03-16T02:15:00.000000+00:00",
+  "agent": "cain",
+  "stage": "RUNNING",
+  "status": "A2A endpoint enabled"
 }