Root cause: sd_notify::notify(true, ...) cleared NOTIFY_SOCKET env var,
so watchdog pings never reached systemd. Backend killed every 60s.
Fixes:
- Change sd_notify::notify first param to false (keep socket)
- Increase WatchdogSec from 60 to 300 (5min) for crash recovery
- Add TimeoutStartSec=300 for slow container startups
- Adjust watchdog ping interval to 120s
This was causing 47 restarts/day on .198 and blocking REBOOT-03,
FLEET-03, FLEET-04, VC-04.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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