The fallback wasn't being triggered because when mode='auto' was
replaced with the recommended backend ('dbus'), the fallback condition
failed. Now properly tracks original_mode to allow fallback.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Major changes:
- Add utils/bluetooth/ package with DBus scanner, fallback scanners
(bleak, hcitool, bluetoothctl), device aggregation, and heuristics
- New unified API at /api/bluetooth/ with REST endpoints and SSE streaming
- Device observation aggregation with RSSI statistics and range bands
- Behavioral heuristics: new, persistent, beacon-like, strong+stable
- Frontend components: DeviceCard, MessageCard, RSSISparkline
- TSCM integration via get_tscm_bluetooth_snapshot() helper
- Unit tests for aggregator, heuristics, and API endpoints
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
