Claude Code: Enable cain_heartbeat cron job to wake worker every minute

- Added cain_heartbeat job with schedule: * * * * * (every minute)
- Pings /api/trigger endpoint to keep worker polling active
- Resolves A2A synchronization deadlock

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

openclaw/.openclaw/cron/jobs.json

@@ -1,5 +1,20 @@
 {
   "jobs": [
+    {
+      "id": "cain_heartbeat",
+      "schedule": "* * * * *",
+      "enabled": true,
+      "description": "Wake Cain worker every minute to keep polling active",
+      "tool": "http_ping",
+      "params": {
+        "url": "https://tao-shen-huggingclaw-cain.hf.space/api/trigger"
+      },
+      "logging": {
+        "file": ".openclaw/logs/heartbeat.jsonl",
+        "format": "jsonl",
+        "retention_days": 7
+      }
+    },
     {
       "id": "health-check",
       "schedule": "*/30 * * * *",