- persistent WS connection to HA with auth + state_changed subscription
- watchdog detects silence > 5min → emits ha_websocket_dead
- immediate ha_websocket_dead on disconnect, exponential reconnect with jitter
- cooldown prevents alert spam (10min repeat window while HA stays down)
- ha_websocket_recovered emitted on reconnect after a dead alert (allows
supervisor to clear active incidents in Phase 5)
- new monitors/ subpackage for long-running tasks (vs interval checks/)
- /health endpoint now includes ws_connected field
- 26 unit tests, 3 integration tests (real HA + container stop/restart)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- new per-host service, follows node-agent pattern
- 7 new HA event types defined (routing in supervisor — Phase 5)
- HeartbeatCheck as pipeline validator (pings /api/, emits ha_websocket_dead)
- service.yaml + host configs for piha (ken) and chelsty-infra (chelsty)
- test scaffolding with aiohttp/aiosqlite mocks (15/15 passing)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Oskar Kapala