S00-028: Record blocked task and remediation handoff

Changes: Preserve incomplete work and blocker metadata for S00-028. This checkpoint does not mark implementation accepted.
Validation: Session ended with status blocked.
Blocker: S00-028 cannot independently validate project filesystem sandbox: installed Codex sandbox exits before command execution because the app-server socket directory must be user-owned with mode 0700. Host socket repair is outside launcher arguments scope.
Automatic blocker limit reached; explicit external resolution required.

Task: S00-028
Agent: auto-ci-cd-211cf3a2bd08
Role: ci-cd
Action: claim
Status: blocked

Task title: Repair conflicting Codex harness sandbox arguments

planning/tasks/S00-030.md

@@ -0,0 +1,60 @@
+# S00-030: Provide a valid Codex sandbox app-server socket directory
+
+- Remediation для: S00-028; root: S00-005; depth: 4
+
+> Generated from planning/tasks.json; status is in state/tasks.json.
+
+- Этап: S00
+- Оператор: ci-cd
+- Reviewer: qa
+- Зависимости: S00-002
+- Требования: инженерная подготовка
+
+## Один результат
+
+Coordinator provides a valid private app-server socket environment and a bounded no-model Codex sandbox probe executes with project write restrictions intact.
+
+## Разрешённые пути
+
+- `docs/AUTOMATION.md`
+
+Не изменять другие modules, shared contracts или spec snapshots без изменения плана. Stem без расширения разрешает принятые stack-specific extensions и focused test рядом.
+
+## Прочитать
+
+- docs/WEB_PROFILE.md
+- docs/ARCHITECTURE.md
+- docs/CONTRACTS.md
+- docs/TESTING.md
+- roles/storage.md
+- docs/decisions/README.md
+- state/blockers/S00-023.md
+- state/blockers/S00-025.md
+- state/blockers/S00-028.md
+- state/blockers/S00-030.md
+
+## Шаги
+
+1. Read S00-028 evidence and coordinate host socket environment ownership/mode correction without changing product files
+2. Document the supplied supported host setup in docs/AUTOMATION.md
+3. Run a bounded no-model project write/read/remove and filesystem restriction diagnostic
+4. Record evidence and submit for independent QA
+
+## Приёмка
+
+1. Codex sandbox no longer fails with the socket directory ownership/mode error
+2. Project write sandbox remains enforced without bypass or broader writable roots
+3. No storage task or additional model is executed
+
+## Focused checks
+
+1. Bounded codex sandbox diagnostic executes a synthetic project write/read/remove probe
+2. Verify effective filesystem restrictions and record exact exit codes
+
+## Блокер и завершение запуска
+
+Для всех ролей scope — только эта задача. При блокере создать issue JSON по state/ISSUE_TEMPLATE.json, вызвать escalate с текущим ID/role/agent, проверить status=blocked и resolution_task, затем немедленно завершить запуск. Не решать blocker и не выбирать следующую задачу самому. Новый агент назначается runner. Правки metadata через CLI — единственное исключение scope.
+
+## Передача
+
+Сохранить evidence/handoff; submit → review и завершить запуск. Reviewer также выполняет только эту задачу, включая обязательное escalate при блокере.