Changed from 10 to 30 minutes to avoid false positives when
heartbeatMinutes is set to 10. The watchdog should be significantly
longer than the heartbeat interval to account for:
- Network latency
- Slow command responses
- Brief connection hiccups
With heartbeatMinutes=10, a 30-minute watchdog gives 3x buffer before
triggering auto-restart.
c5677df56e