Android Auto's Unknown sources setting covers media, messaging and
parked apps; it has never covered the Car App Library, so the README's
advice to turn it on could not have worked. A head unit lists DriverVault
only when Play was the installer — an internal track is enough — and the
Desktop Head Unit is what takes a sideloaded build. Say that instead, and
say which APK the DHU wants, since only a debug build allows its host.
minCarApiLevel also claimed a floor lower than the screens stand on:
GarageScreen asks for ConstraintManager, which is level 2.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
