feat(wbs): AEG-VS-01-04 BE Vertical Slice - Endpoints & Handlers (Part 1)
- RegisterIdentity endpoint (POST /api/identities)
- RequestMfaSetup endpoint (PUT /api/identities/{id}/request-mfa)
- SQL repositories w/ optimistic concurrency (revision tracking)
- Application handlers (IEndpointHandler pattern)
- ValidationException + ProblemDetails error handling
- Unit tests: RegisterIdentityHandlerTests (4), RequestMfaSetupHandlerTests (4)
- Domain state machines integrated (IdentityState lifecycle)
- AGENTS.md v16.0: endpoint authority, idempotency, correlation ID ready
DI registration & integration tests deferred to next session.
17 new files, 500+ LOC, 8/8 unit tests ready to run
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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