1. P2-1: Unified Contact Model normalisieren — COMPLETE
2. P1-4: Transactional Outbox — COMPLETE
3. Continue with next fix task from FIX-PLAN.md (next priority)
4. Pre-existing test failures (403/404 in test_contacts.py) need separate investigation — not caused by P1-4 or P2-1
5. notification.created event in notifications.py kept on event_bus.publish() (local notification signal, not a domain event needing cross-process delivery)