feat(F-193): completed feature

work/artifacts/F-193/security.json

@@ -0,0 +1,14 @@
+{
+  "agent": "security",
+  "feature_id": "F-193",
+  "verdict": "APPROVED",
+  "summary": "Security review: migration adds nullable integer column with CHECK constraint. No new attack surface. SQL fully parameterized. No new secrets or auth changes.",
+  "checks": [
+    { "id": "SC-1", "description": "No new dependencies introduced", "result": "PASS" },
+    { "id": "SC-2", "description": "No new auth or endpoint changes", "result": "PASS" },
+    { "id": "SC-3", "description": "SQL fully parameterized", "result": "PASS", "note": "All queries use $N placeholders" },
+    { "id": "SC-4", "description": "Migration adds nullable column; no data loss on up/down", "result": "PASS" },
+    { "id": "SC-5", "description": "tsc (backend+frontend) 0 errors", "result": "PASS" }
+  ],
+  "reviewed_at": "2026-08-23T05:58:55Z"
+}