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### Stability Agent
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A lightweight filesystem-first watchdog and observer agent for CHELSTY.
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#### Features
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* **Continuous Monitoring**: Runs as a background service.
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* **Docker Inspection**: Checks container status via read-only Docker socket.
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* **Disk Usage**: Monitors local disk utilization.
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* **Tailscale Check**: Verifies Tailscale availability.
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* **MQTT Reachability**: Checks connectivity to the local MQTT broker.
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* **Zigbee2MQTT Monitoring**: Specifically monitors the Zigbee2MQTT container.
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* **Redis Publishing**: (Optional) Publishes runtime state and events to a central Redis server.
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* **Event Logging**: Writes append-only JSON events to `/opt/homelab/events/YYYY-MM-DD/chelsty/`.
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* **State Reporting**: Writes heartbeat and status summary to `/opt/homelab/state/`.
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#### Configuration
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Environment variables:
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* `STABILITY_CHECK_INTERVAL`: Interval between checks in seconds (default: 60).
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* `DISK_THRESHOLD_PCT`: Disk usage percentage to trigger warning (default: 90).
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* `MQTT_HOST`: Hostname or IP of the MQTT broker to check.
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* `MQTT_PORT`: Port of the MQTT broker (default: 1883).
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* `REDIS_HOST`: Hostname or IP of the Redis server (e.g., PIHA at 100.108.208.3).
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* `REDIS_PORT`: Port of the Redis server (default: 6379).
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* `REDIS_ENABLED`: Whether to enable Redis publishing (default: true if REDIS_HOST is set).
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* `NODE_NAME`: Name of the current node (default: chelsty).
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#### Verification
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You can verify the Redis publishing using `redis-cli`:
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```bash
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# Check node state
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redis-cli -h 100.108.208.3 HGETALL homelab:nodes:chelsty
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# Check service discovery
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redis-cli -h 100.108.208.3 HGETALL homelab:services:chelsty:stability-agent
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# Check event stream
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redis-cli -h 100.108.208.3 XRANGE homelab:events - +
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```
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#### Safety
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* No automatic restarts are performed.
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* Read-only access to Docker socket.
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* No configuration mutation.
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* No secrets stored in the repository.
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#### Event Schema
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Events are written as JSON lines with the following fields:
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* `id`: Unique event UUID.
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* `timestamp`: ISO 8601 timestamp (UTC).
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* `node`: `chelsty`.
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* `source`: `stability-agent`.
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* `type`: Type of event (e.g., `disk_usage_high`, `containers_not_running`).
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* `severity`: `info`, `warning`, or `error`.
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* `message`: Human-readable description.
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* `details`: Object containing specific check results.
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