Tier-3 background-audio audit (item #4 found the only gap):
AudioTrackPlayer.start() never called requestAudioFocus, so an
inbound phone call mixed on top of the room audio instead of
ducking it. Fixed by acquiring focus at the SERVICE level (one
owner per room session, not per player) in
AudioRoomForegroundService.requestAudioFocus():
* AUDIOFOCUS_GAIN with USAGE_VOICE_COMMUNICATION +
CONTENT_TYPE_SPEECH so the OS treats the room like a phone
call.
* setAcceptsDelayedFocusGain(false) — immediate focus or
nothing.
* On-change listener is a no-op; the OS handles duck-on-loss.
* abandonAudioFocusRequest in onDestroy.
* Best-effort acquire — runCatching swallows denials so a
refused request doesn't fail service start (the OS will
duck/pause us by its own policy, which is degraded but
acceptable).
Audit notes file under nestsClient/plans/ documents items 1-5
with commit-time citations:
1. PARTIAL_WAKE_LOCK — already correct
2. FG type microphone (14+) — already correct
3. FG type media-playback for listen-only — already correct
4. Audio focus — fixed in THIS commit
5. PIP keep-alive — already correct
Claude