Briefing for the on-device agent covering commits 47321e3, f7e602c,
and 887b9c9: what was reverted vs kept, the UI re-wire, the parked
controlsd swap mechanism, build prerequisites, runtime verification
commands, and a troubleshooting playbook.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
