v0.4.0-bluetooth

v0.4.0 — Bluetooth RFCOMM Transport

Breaking change: Replaced Wi-Fi (UDP discovery + TCP sockets) with Bluetooth RFCOMM. Fixes AP isolation issues on routers.

What changed

• Python daemon: Now connects to phone via Bluetooth RFCOMM (PC = BT client)
• Android service: Now listens for Bluetooth connections (phone = BT server)
• Config: Removed IP/port/poll settings, added device.bluetooth_mac
• Mutual auth PSS fix: Cross-platform salt length match between Python cryptography and Android KeyStore
• NixOS module: Removed firewall rule, added bluetooth_mac option

Migration

1. Pair phone with PC at OS level (Bluetooth settings)
2. Set bluetooth_mac in config
3. Install new APK
4. Rebuild NixOS config

Files changed

 M android/app/src/main/AndroidManifest.xml
 M android/app/src/main/java/.../CryptoManager.kt
 M android/app/src/main/java/.../HandshakeModels.kt
 M android/app/src/main/java/.../PhonectNetworkService.kt
 M android/app/src/main/java/.../ProtocolHandler.kt
 M phonect-service.nix
 M src/phonect/config.py
 M src/phonect/crypto.py
 M src/phonect/daemon.py
 M tests/test_daemon.py