Win3 watchdog heartbeat (= external dead-man check source、updated every 60s)

heartbeat_init.json

{"ts": "2026-05-26T09:00:00Z", "ts_epoch": 1779789600, "watchdog_version": "1.0", "note": "initial placeholder, overwritten by daemon"}

watchdog_heartbeat.json

{
  "ts": "2026-08-20T00:34:44Z",
  "ts_epoch": 1787186084,
  "watchdog_version": "1.0",
  "services": {
    "win3_exec": true,
    "win3_bracket_watcher": true,
    "win3_derivatives_sidecar": true
  },
  "pause_mode": false,
  "webhook_http": 200,
  "anomalies": []
}