feat(pre-push-safety-net): compare targeted base and head evidence

.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": "2026-09-13T09:50:01.821464+00:00",
+  "updated_at": "2026-09-13T10:26:47.307154+00:00",
   "language": "en",
   "phase": "implementation",
   "approvals": {
@@ -19,7 +19,7 @@
     }
   },
   "ready_for_implementation": true,
-  "implementation_approval_note": "Groups 1\u20133 verified complete. Contributor-scan frontend-retention prerequisite 2.18 approved and verified. Remaining approved tasks require independent review and fresh verification.",
+  "implementation_approval_note": "Groups 1\u20133 verified complete. Maintainer explicitly authorized group 4 as a whole; each task requires independent review and fresh verification.",
   "depends_on": [
     "contributor-scan"
   ],
@@ -55,6 +55,11 @@
       "at": "2026-09-13T09:17:01.788332+00:00",
       "source": "approved",
       "action": "Approved contributor-scan frontend retention prerequisite; implement it and resume task 3.4 review and verification."
+    },
+    {
+      "at": "2026-09-13T10:26:47.307154+00:00",
+      "source": "move on to group 4 as a whole",
+      "action": "Authorized all of group 4 (4.1\u20134.3), sequential implementation, independent task review and fresh verification. Groups 5\u20138 remain pending."
     }
   ],
   "task_review": {
@@ -78,14 +83,16 @@
       "3.1",
       "3.2",
       "3.3",
-      "3.4"
+      "3.4",
+      "4.1"
     ],
-    "remaining_tasks": 16,
-    "verification_record": "implementation-group-3.md",
+    "remaining_tasks": 15,
+    "verification_record": "implementation-group-4.md",
     "verification_records": [
       "implementation-group-1.md",
       "implementation-group-2.md",
-      "implementation-group-3.md"
+      "implementation-group-3.md",
+      "implementation-group-4.md"
     ],
     "next_group": 4,
     "blocked_tasks": []