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: Agent exited with code 1

Task: S00-012
Agent: auto-qa-98b05bd56c25
Role: qa
Action: review
Status: blocked

Task title: Fix runner prompt delivery after partial stdin timeout

state/handoffs/S00-012.md

@@ -8,3 +8,12 @@ Review cumulative S00-012 source checkpoints c28412a (stdin and delayed UTF-8 re
 Actual checks: legacy pipe failure reproduced on Python 3.9.6 with 140000 UTF-8 bytes and a .5-second delayed reader (both communicate calls timed out; child killed/reaped). Automation suite: 28 tests passed in 11.202s, exit 0. Complete 140024-byte UTF-8/EOF, fresh sessions, prompt budgets, scope, timeout/submit descendant cleanup and deterministic repeated-cleanup tests pass. make check: 72 tests passed in 17.834s, exit 0; 279 tasks validated with immutable snapshot checks. No blocker found.
 
 Evidence: state/evidence/S00-012-auto-ci-cd-f101e40d9902.md. No model, browser, product/provider readiness, Windows cleanup or fresh natural EPERM claim. Root S00-002 is not accepted by this submission. Coordinator must commit the submission before launching a fresh QA review; this process ends after submit.
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+
+# Blocked handoff
+
+Original: S00-012; reporter: auto-qa-98b05bd56c25; resolution: S00-015.
+
+Agent exited with code 1
+
+Next: complete and review the remediation; only a fresh session may continue.