Switch to bleak for reliable BLE scanning with RSSI
- Replace hcitool-based BT scanning with bleak Python library - Bleak provides reliable RSSI values via D-Bus/BlueZ - BLE scan now finds devices that hcitool missed - Update project docs to reflect resolved BT RSSI blocker - Add bleak>=0.21.0 to dependencies Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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