Claude Code: Fix Cain - add missing health and error_display fields to memory/cain_status.json

This fixes the "Error: unknown" display issue where the status file was missing the health and error_display fields.

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

memory/cain_status.json

@@ -1,9 +1,13 @@
 {
   "current_state": "idle",
   "stage": "RUNNING_A2A_READY",
-  "last_updated": "2026-03-16T16:08:30.462194+00:00",
+  "last_updated": "2026-03-16T21:20:00.000000+00:00",
   "agent": "cain",
   "error": null,
+  "health": "HEALTHY",
+  "error_display": "None",
+  "_note": "error=null means healthy - health field is authoritative",
+  "_fixed": "Added missing health and error_display fields",
   "startup_checks": {
     "openclaw_imported": true,
     "brain_imported": true