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AEG-VS-01-03: Identity & Role Assignment State Machines Implementation: 1. IdentityState.cs - 7 states: UNDEFINED → ACTIVE → REQUIRES_MFA_SETUP → MFA_CONFIGURED → MFA_SUSPENDED → INACTIVE → REVOKED - Immutable value object with typed transitions - State queries (IsActive, IsMfaRequired, CanReceiveRoles) - No infrastructure dependencies (pure domain logic) 2. RoleAssignmentState.cs - Maker-Checker workflow: PENDING_APPROVAL → APPROVED_BY_1 → APPROVED_BY_2 → ACTIVE → EXPIRED/REVOKED/REJECTED - Approval count constraints enforced at state level - Immutable state transitions 3. IdentityStateTests.cs - 9 unit tests covering all transitions - Boundary testing (invalid transitions throw) - State query tests - Value object equality Principles: - 정공법: State machine encoded in domain, not middleware - SOLID: Single responsibility (state transitions) - 과유불액: Only what contract requires - 안정성: Immutable value objects, exception-based validation - 재현성: Pure C# logic, no DB/external dependencies All tests PASSING (9/9) Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>