feat: add Home Assistant integration (REST tools + WebSocket gateway)

- Add ha_list_entities, ha_get_state, ha_call_service tools via REST API
- Add WebSocket gateway adapter for real-time state_changed event monitoring
- Support domain/entity filtering, cooldown, and auto-reconnect with backoff
- Use REST API for outbound notifications to avoid WS race condition
- Gate tool availability on HASS_TOKEN env var
- Add 82 unit tests covering real logic (filtering, payload building, event pipeline)

pyproject.toml

@@ -47,6 +47,7 @@ cli = ["simple-term-menu"]
 tts-premium = ["elevenlabs"]
 pty = ["ptyprocess>=0.7.0"]
 honcho = ["honcho-ai>=2.0.1"]
+homeassistant = ["aiohttp>=3.9.0"]
 all = [
   "hermes-agent[modal]",
   "hermes-agent[messaging]",
@@ -57,6 +58,7 @@ all = [
   "hermes-agent[slack]",
   "hermes-agent[pty]",
   "hermes-agent[honcho]",
+  "hermes-agent[homeassistant]",
 ]
 
 [project.scripts]