Music ran under a foreground service whose lifecycle observer was registered for
App TV, so backgrounding the app on a head unit never paused it and driving never
stopped it. Both halves were wrong for a car: parked audio must survive the app
going to the background, and DD-2 requires it to stop when the vehicle starts
moving.
The vehicle now owns exactly the pause it caused. It is claimed when a restriction
arrives and discharged on the event that proves the resume, so a track the user
paused during a drive stays paused when the car parks. A restriction landing while
the next source is still resolving silences the native player as well as the
session, because the previous track is still coming out of it, and a pause that
throws ends the session rather than leaving audio running in a moving car.
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