feat: Phase 6 UAT - Admission control, HLC recency, cluster coordination
This commit includes comprehensive work on Phase 6 features:
## Admission Control (Phase 6 admission middleware)
- AdmissionStore implementation backed by TrustRankStore
- PoW verification with tier-based difficulty computation
- Trust tier progression (Newcomer → Established → Trusted → Authority)
- API integration with admission status endpoints
## HLC Recency Lens (Phase 6C)
- HlcRecencyLens for distributed system ordering
- Hybrid logical clock integration with causality preservation
## Cluster Coordination (Phase 6C)
- Multi-node cluster tests (availability, partition tolerance)
- CRDT convergence tests for anti-entropy sync
- Gateway handler improvements
## Aphoria Code Linter (Phase 2A)
- RFC/OWASP corpus builders with network fetching and caching
- Concept hierarchy with auto-alias creation on conflict detection
- Multiple security extractors (TLS, JWT, CORS, secrets, rate limiting)
## Code Organization
- Split large files into modules to comply with 500-line limit
- Improved test organization with separate test modules
- Fixed rkyv serialization for EigenTrustState (AgentScore struct)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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