O365 calendar sync (hourly) — scrapes OWA calendar print preview via headless Playwright, syncs events to Google Calendar via apestaart API. Current + next month. Matches attendance by email to set free/busy transparency. Systemd timer: apestaart_funlhncal.timer (OnUnitActiveSec=3600s) on ironclad. Entry point: apestaart-o365cal (venv: apestaart). Shares browser state with apestaart_funlhnfwd and apestaart_fullcalsync. Auth guards: quiet hours (8pm-7am Adelaide), shared auth lock file, ntfy unlock flow.