S00-012: Verify runner prompt delivery and lifecycle regressions

Changes: Record verification evidence and replace the blocked S00-012 handoff with independent QA review instructions. Retain the existing stdin implementation and regressions from prior checkpoints; no new source changes.
Validation: Reproduced the legacy partial stdin timeout on Python 3.9.6 and reaped the child. All 28 automation tests passed, including exact 140024-byte UTF-8/EOF and timeout/submit descendant cleanup. make check passed all 72 tests; git diff --check passed. No live model, application readiness or Windows cleanup check is claimed.

Task: S00-012
Agent: auto-ci-cd-f101e40d9902
Role: ci-cd
Action: claim
Status: review

Task title: Fix runner prompt delivery after partial stdin timeout

planning/TASK_MATRIX.md

@@ -1,6 +1,6 @@
 # Матрица задач
 
-Generated; state revision **22**. Canonical status: state/tasks.json.
+Generated; state revision **24**. Canonical status: state/tasks.json.
 
 | ID | Этап | Оператор | Reviewer | Статус | Owner | Зависимости | Задача |
 | --- | --- | --- | --- | --- | --- | --- | --- |
@@ -14,7 +14,7 @@ Generated; state revision **22**. Canonical status: state/tasks.json.
 | [S00-008](tasks/S00-008.md) | S00 | ci-cd | qa | todo |  | S00-003, S00-004 | Описать WSS/upload/TURN/push topology |
 | [S00-009](tasks/S00-009.md) | S00 | orchestrator | security | todo |  | S00-003, S00-004, S00-005, S00-006, S00-007, S00-008 | Согласовать результаты spikes |
 | [S00-011](tasks/S00-011.md) | S00 | ci-cd | security | done | auto-ci-cd-d105e8027730 | S00-001 | Restore verified npm registry access for the stack spike |
-| [S00-012](tasks/S00-012.md) | S00 | ci-cd | qa | todo |  | S00-001, S00-011, S00-013, S00-014 | Fix runner prompt delivery after partial stdin timeout |
+| [S00-012](tasks/S00-012.md) | S00 | ci-cd | qa | review | auto-ci-cd-f101e40d9902 | S00-001, S00-011, S00-013, S00-014 | Fix runner prompt delivery after partial stdin timeout |
 | [S00-013](tasks/S00-013.md) | S00 | ci-cd | qa | done | auto-ci-cd-5f68f03dd33b | S00-001, S00-011 | Bound oversized S21-006 runner context without truncating requirements |
 | [S00-014](tasks/S00-014.md) | S00 | ci-cd | qa | done | auto-ci-cd-14343249da62 | S00-001, S00-011, S00-013 | Fix repeated runner cleanup after a submitted parent is reaped |
 | [S00-010](tasks/S00-010.md) | S00 | qa | orchestrator | todo |  | S00-001, S00-002, S00-003, S00-004, S00-005, S00-006, S00-007, S00-008, S00-009 | Gate: Профиль и проверка стека |