feat(F-120): completed feature

work/artifacts/F-120/reviewer.json

@@ -0,0 +1,17 @@
+{
+  "feature_id": "F-120",
+  "agent": "reviewer",
+  "stage": "review_gate",
+  "verdict": "APPROVED",
+  "reviewed_at": "2026-08-21",
+  "summary": "Categories can now be deleted; children and product-category links cascade at the DB level so the audit shows no orphans.",
+  "checks": [
+    { "item": "Migration 041 changes FKs to ON DELETE CASCADE", "ok": true },
+    { "item": "Migration 041 has idempotent down (back to RESTRICT)", "ok": true },
+    { "item": "DeleteCategory.execute no longer checks hasChildren", "ok": true },
+    { "item": "DeleteCategoryResult reduced to 'deleted' | 'not_found'", "ok": true },
+    { "item": "DELETE /categories/:id returns 204 on success, 404 on missing", "ok": true },
+    { "item": "typecheck + 172 tests pass", "ok": true }
+  ],
+  "issues": []
+}