release: prepare v1.2.0-alpha.1 and record rollout blockers

.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": "2026-09-14T06:06:32.633405+00:00",
+  "updated_at": "2026-09-14T06:10:56.975614+00:00",
   "language": "en",
   "phase": "implementation",
   "approvals": {
@@ -150,5 +150,12 @@
       "record": "../contributor-scan/census-repair-verification.md",
       "effect": "Node 44/44 input census restored; partial/missing census remains explicitly unresolved. Existing eligibility stale; runtime/context/independent qualification remain NO-GO."
     }
+  },
+  "release": {
+    "tag": "v1.2.0-alpha.1",
+    "package_version": "1.2.0a1",
+    "channel": "alpha",
+    "rollout_decision": "NO-GO",
+    "status_record": "status.md"
   }
 }