[Lyten02]

What

• Protocol v2 (PROTOCOL_VERSION = 2): both sides report their controls (PcControls: audio, mic, mic_default, playback volume; PhoneControls: mic switch, mic_ready, media volume) and can request changes (SetPc / SetPhone). Core only forwards requests; the apps apply them. Control streams are read through a channel so select! never drops half a frame. An old-version Hello is rejected with a readable reason.
• PC: one-switch Микрофон (accept mic + switch the phone mic on + CABLE Output as the Windows default recording device; off restores the previous one). Звук ПК on also undoes a CABLE takeover of the playback device. New Управление card: PC volume/mute (IAudioEndpointVolume with change callback, no polling), phone volume, phone mic, default-mic switch.
• Phone: each connected PC card has PC audio, PC mic and PC volume/mute controls. The microphone FGS type is kept whenever RECORD_AUDIO is granted, so the PC can switch the mic on in the background. PC requests set the mic pref and media volume.
• Merged with the phone-side mute feature from 0.2.0.

Breaking

Protocol v2: PC and phone must both be updated.

Verification

• cargo clippy --workspace --all-targets -D warnings + cargo ndk -t arm64-v8a clippy -p audiobridge-android: clean
• cargo test --workspace: all pass, incl. new remote_control_in_both_directions integration test
• Gradle: JVM tests pass, lint 0 errors, APK builds
• On device (pre-merge build): POCO F5 + PC connected over Tailscale, both UIs show live remote state

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