S00-012: Approve complete runner prompt delivery after lifecycle checks

Changes: Accept the preserved S00-012 stdin correction and descendant regressions; record independent QA evidence. No source changes.
Validation: Reproduced the legacy 140000-byte delayed-reader timeout and reaped the child. All 28 automation tests and 72 make check tests passed, including complete UTF-8/EOF, submit/timeout descendant cleanup, fresh sessions, scope and snapshots. Reviewed executor message and cumulative patches; git diff --check passed. No Windows, live model or application readiness claim.

Task: S00-012
Agent: auto-qa-04bdb7324ecc
Role: qa
Action: review
Status: done

Task title: Fix runner prompt delivery after partial stdin timeout

planning/stages/S00.md

@@ -7,7 +7,7 @@
 ## Задачи
 
 - [S00-001](../tasks/S00-001.md): Утвердить Web-профиль — orchestrator; done.
-- [S00-002](../tasks/S00-002.md): Выбрать framework и build runtime — orchestrator; blocked.
+- [S00-002](../tasks/S00-002.md): Выбрать framework и build runtime — orchestrator; review.
 - [S00-003](../tasks/S00-003.md): Проверить XMPP WSS/auth библиотеку — protocol; todo.
 - [S00-004](../tasks/S00-004.md): Проверить browser OMEMO backend — crypto; todo.
 - [S00-005](../tasks/S00-005.md): Выбрать IndexedDB wrapper и migration policy — storage; todo.
@@ -16,7 +16,7 @@
 - [S00-008](../tasks/S00-008.md): Описать WSS/upload/TURN/push topology — ci-cd; todo.
 - [S00-009](../tasks/S00-009.md): Согласовать результаты spikes — orchestrator; todo.
 - [S00-011](../tasks/S00-011.md): Restore verified npm registry access for the stack spike — ci-cd; done.
-- [S00-012](../tasks/S00-012.md): Fix runner prompt delivery after partial stdin timeout — ci-cd; review.
+- [S00-012](../tasks/S00-012.md): Fix runner prompt delivery after partial stdin timeout — ci-cd; done.
 - [S00-013](../tasks/S00-013.md): Bound oversized S21-006 runner context without truncating requirements — ci-cd; done.
 - [S00-014](../tasks/S00-014.md): Fix repeated runner cleanup after a submitted parent is reaped — ci-cd; done.
 - [S00-015](../tasks/S00-015.md): Устранить прерывание: Fix runner prompt delivery after partial stdin timeout — ci-cd; done.