Delete disabled onboarding/observation/firstday_checkin talent files, tests, CLI commands, and all stale references. Set first_daily_ready unconditionally on first daily analysis (was gated on onboarding completion status that no longer exists). Rename test_onboarding.py to test_convey_apps.py retaining only the live convey app tests. 9 files deleted, ~3700 lines removed across 35 files.