feat(pre-push-safety-net): measure frozen PMPro and Node replay feasibility

.kiro/specs/pre-push-safety-net/spec.json

@@ -1,7 +1,7 @@
 {
   "feature_name": "pre-push-safety-net",
   "created_at": "2026-09-12T15:35:00Z",
-  "updated_at": "2026-09-13T13:11:42.850127+00:00",
+  "updated_at": "2026-09-13T13:22:55.634332+00:00",
   "language": "en",
   "phase": "implementation",
   "approvals": {
@@ -19,7 +19,7 @@
     }
   },
   "ready_for_implementation": true,
-  "implementation_approval_note": "Group5 authorized. Task5.1 and its observed deadline regression repaired and verified with manual Kiro fallback; task5.2 resumes under a newly frozen core identity.",
+  "implementation_approval_note": "Groups1\u20135 implemented and verified (16/27). Group5 used manual Kiro fallback review, repaired observed predecessor deadline bugs, and executed a newly frozen PMPro/Node experiment. Measured feasibility NO-GO; real capabilities remain disabled. Groups6\u20138 pending.",
   "depends_on": [
     "contributor-scan"
   ],
@@ -92,9 +92,10 @@
       "4.1",
       "4.2",
       "4.3",
-      "5.1"
+      "5.1",
+      "5.2"
     ],
-    "remaining_tasks": 12,
+    "remaining_tasks": 11,
     "verification_record": "implementation-group-5.md",
     "verification_records": [
       "implementation-group-1.md",
@@ -103,7 +104,8 @@
       "implementation-group-4.md",
       "implementation-group-5.md"
     ],
-    "next_group": 5,
-    "blocked_tasks": []
+    "next_group": 6,
+    "blocked_tasks": [],
+    "feasibility": "NO-GO: six cold replay timeouts; no completed supported target checks; warm performance and eligibility unproven"
   }
 }