- Gateway validates SQS requests against Authentik JWKS - JWKS cached with 15min TTL, auto-refresh on key rotation - Verifies claims: iss, aud, exp, nbf, permissions - Returns 403 with error details on failure - Integration tests: reject without JWT, accept with valid JWT - All tests passing Phase 3 progress: 1/3 (next: 3.2 MinIO load-test)