S00-012: Record blocked task and remediation handoff

Changes: Preserve incomplete work and blocker metadata for S00-012. This checkpoint does not mark implementation accepted.
Validation: Session ended with status blocked.
Blocker: Submit-transition descendant regression fails: repeated stop_process_tree after parent reap raises EPERM at os.killpg; launch OSError handling then attempts invalid escalation from review state.

Task: S00-012
Agent: auto-ci-cd-28868645424b
Role: ci-cd
Action: claim
Status: blocked

Task title: Fix runner prompt delivery after partial stdin timeout

state/tasks.json

@@ -1,6 +1,6 @@
 {
   "schema_version": 1,
-  "revision": 17,
+  "revision": 19,
   "tasks": {
     "S00-001": {
       "status": "done",
@@ -1136,15 +1136,17 @@
       "completed_at": "2026-10-14T18:11:33+00:00"
     },
     "S00-012": {
-      "status": "todo",
-      "owner": null,
+      "status": "blocked",
+      "owner": "auto-ci-cd-28868645424b",
       "external_wait": false,
-      "reason": null,
-      "started_at": "2026-10-14T18:33:49+00:00",
-      "updated_at": "2026-10-14T18:42:03+00:00",
-      "blocked_by": [],
+      "reason": "Submit-transition descendant regression fails: repeated stop_process_tree after parent reap raises EPERM at os.killpg; launch OSError handling then attempts invalid escalation from review state.",
+      "started_at": "2026-10-14T18:42:03+00:00",
+      "updated_at": "2026-10-14T18:45:16+00:00",
+      "blocked_by": [
+        "S00-014"
+      ],
       "resume_status": "in_progress",
-      "blocker_report": "state/blockers/S00-013.md",
+      "blocker_report": "state/blockers/S00-014.md",
       "handoff": "state/handoffs/S00-012.md",
       "previous_owner": "manual-ci-cd-stdin-20261015b",
       "resumed_after_blocker": true
@@ -1161,6 +1163,12 @@
       "reviewer": "auto-qa-869b22acd478",
       "review_evidence": "state/evidence/S00-013-review.md",
       "completed_at": "2026-10-14T18:42:03+00:00"
+    },
+    "S00-014": {
+      "status": "todo",
+      "owner": null,
+      "external_wait": false,
+      "reason": null
     }
   },
   "events": [
@@ -1375,11 +1383,35 @@
       "to": "done",
       "reason": null,
       "evidence": "state/evidence/S00-013-review.md"
+    },
+    {
+      "revision": 18,
+      "at": "2026-10-14T18:42:03+00:00",
+      "action": "claim",
+      "task": "S00-012",
+      "agent": "auto-ci-cd-28868645424b",
+      "role": "ci-cd",
+      "from": "todo",
+      "to": "in_progress",
+      "reason": null
+    },
+    {
+      "revision": 19,
+      "at": "2026-10-14T18:45:16+00:00",
+      "action": "escalate",
+      "task": "S00-012",
+      "resolution_task": "S00-014",
+      "agent": "auto-ci-cd-28868645424b",
+      "role": "ci-cd",
+      "from": "in_progress",
+      "to": "blocked",
+      "reason": "Submit-transition descendant regression fails: repeated stop_process_tree after parent reap raises EPERM at os.killpg; launch OSError handling then attempts invalid escalation from review state."
     }
   ],
   "retired_agents": [
     "auto-orchestrator-3a4f07103316",
     "manual-security-stdin-20261015a",
-    "manual-ci-cd-stdin-20261015b"
+    "manual-ci-cd-stdin-20261015b",
+    "auto-ci-cd-28868645424b"
   ]
 }