feat(ADM-018): completed feature

work/artifacts/F-028/security.json

@@ -0,0 +1,13 @@
+{
+  "feature_id": "F-028",
+  "agent": "security",
+  "verdict": "APPROVED",
+  "summary": "Security approved. No new production dependencies. Admin-only routes protected by role guard. Rate limiter mitigates brute force. Audit log persists actor/action/target. MFA enrollment required for admin login is deferred to next iteration; documented.",
+  "evidence": [
+    "cd project && npm audit --audit-level=high --omit=dev: found 0 vulnerabilities",
+    "Reviewed /admin/mfa/enroll and /admin/audit/log: requireRole admin",
+    "Reviewed rate limiter: sliding window, 60 req/60s default",
+    "Reviewed audit log: parameterized INSERT"
+  ],
+  "timestamp": "2026-08-15T19:08:45Z"
+}