MB3 (PBX spec 13 §5). Expo SDK 58 + Expo Router, with the PBX repo as a
submodule for @selfphoneng/shared types (import type only).
- pair by scanning the QR from My settings → Mobile app, by typing the
server and code, or from a selfphoneng://pair link (waits for a tap)
- the device token lives in expo-secure-store; a 401 goes back to pairing
- home shows who and which extension the phone is paired as; Sign out
removes the phone on the server too
- README: Android APK build (and the Windows long-path fix), iPhone
builds with ios-builder
