Adds com.allgo.carplay.service to immersive.full in Android 9's policy_control setting when switched on, removes only that entry when off. Car build (system user) only. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LhzAVaUyqcw5PkGjz4mWW6