"""Onboarding domain — first-class process + blocker state machine.

Symmetric to the offboarding domain (since migration 229, 2026-06-01).
Owns:

* ``onboarding_processes`` — one row per hire, state machine through
  scanning → preparing → ready → live → completed (+ cancelled)
* ``onboarding_blockers`` — per-resource Day-1 gaps
* ``onboarding_reminder_log`` — escalation idempotency markers

The cockpit (``OnboardingCockpitService`` in ``cockpit_service``) reads
from these tables instead of recomputing the 7 dimensions per page-load.
The HR sync coordinator calls ``OnboardingService.start_process`` on
every new-hire confirmation; the scheduled jobs at
``app/scheduled_jobs/onboarding_handlers.py`` drive the lifecycle.
"""