feat: face display bridge node (Issue #394)
Implement ROS2 node bridging orchestrator state to face display expressions.
Maps /social/orchestrator/state and /saltybot/wake_word_detected to HTTP API.
Features:
- Subscribes to /social/orchestrator/state (JSON: IDLE, LISTENING, THINKING, SPEAKING, THROTTLED)
- Subscribes to /saltybot/wake_word_detected for immediate Alert response
- HTTP GET requests to face display server (configurable localhost:3000/face/{id})
- State to expression mapping:
* IDLE → 0 (Tracking)
* LISTENING → 1 (Alert)
* THINKING → 3 (Searching)
* SPEAKING → 4 (Social)
* Wake word → 1 (Alert, immediate override)
- Publishes /face/state with JSON: {face_id, orchestrator_state, timestamp}
- Configurable face_server_url parameter
- Fallback to urllib if requests library unavailable
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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