New features:
- Health check command (somework:cqrs:health) with exit codes 0/1/2 for K8s probes and CI
- Event ordering vocabulary (SequenceAware + AggregateSequenceStamp + SequenceStampDecider)
- Rate limiting via Symfony RateLimiterFactory with per-message-type throttling
- Transactional outbox (DbalOutboxStorage + somework:cqrs:outbox:relay command)
- Complete documentation suite and UPGRADE.md migration guide

Quality:
- 764 tests, 2364 assertions, PHPStan level 8, PHP 8.2–8.4
- 5-agent deep review passed