Add 5 animal lifecycle event handlers with TDD:
- HatchRecorded: Creates hatchling animals at brood/event location
- AnimalOutcome: Records death/harvest/sold with yields, status updates
- AnimalPromoted: Sets identified flag, nickname, optionally updates sex/repro_status
- AnimalMerged: Merges animal records, creates aliases, removes merged from live roster
- AnimalStatusCorrected: Admin-only status correction with required reason
All events include:
- Projection handlers in animal_registry.py and intervals.py
- Event-animal linking in event_animals.py
- Service methods with validation in animal.py
- 51 unit tests covering event creation, projections, and validation
- E2E test #7 (harvest with yields) per spec §21.7
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
