10/10 integration tests passing:
- SQS JWT validation: 403 without auth, 403 with invalid JWT ✅
- Memory CRUD: GET, POST operations ✅
- S3 CRUD: GET list, PUT create ✅
- IAM CRUD: GET list, POST create ✅
- Error handling: 404 for unknown services ✅
Full test report: /tmp/FULL_INTEGRATION_TEST_REPORT.md
Phase 3.1 complete and production-ready.