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/issues/S00-012-auto-ci-cd-28868645424b.json

@@ -0,0 +1,30 @@
+{
+  "title": "Fix repeated runner cleanup after a submitted parent is reaped",
+  "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.",
+  "reproduction": "python3 -m unittest discover -s tests/tooling -p test_automation.py -v; test_submit_transition_stops_source_writing_descendant errors. In-memory trace: first cleanup returns parent -15; repeated cleanup raises PermissionError at runner.py:340. Evidence: state/evidence/S00-012-auto-ci-cd-28868645424b.md",
+  "role": "ci-cd",
+  "reviewer_role": "qa",
+  "scope": [
+    "scripts/runner.py",
+    "tests/tooling/test_automation.py"
+  ],
+  "outcome": "Reliable repeated lifecycle cleanup after submit with a reaped parent and SIGTERM-ignoring descendant, preserving actual process-tree termination and valid workflow state.",
+  "steps": [
+    "Read S00-012 evidence and preserved descendant regressions.",
+    "Reproduce repeated cleanup EPERM in the supplied execution harness without launching a model.",
+    "Correct only the repeated-cleanup lifecycle failure; retain fail-closed handling for inaccessible live descendants and terminal/deadline monitoring.",
+    "Run descendant, delayed stdin and existing lifecycle checks plus make check; record evidence and submit."
+  ],
+  "acceptance": [
+    "Submit-transition descendant regression completes without invalid escalation or delayed source writes.",
+    "Timeout and terminal-transition paths terminate descendants, including SIGTERM-ignoring children.",
+    "Repeated cleanup does not hide a failure to terminate a live process; stdin delivery and prompt budgets remain intact."
+  ],
+  "checks": [
+    "Both preserved descendant regressions.",
+    "Delayed-reader UTF-8/EOF, timeout, transition, scope and fresh-session runner checks.",
+    "make check"
+  ],
+  "depends_on": [],
+  "requires_user_input": false
+}