S00-020: Record blocked task and remediation handoff

Changes: Preserve incomplete work and blocker metadata for S00-020. This checkpoint does not mark implementation accepted.
Validation: Session ended with status blocked.
Blocker: Previous runner session was interrupted before submit/escalate; processes stopped. User now explicitly requests resuming development. Preserve partial artifacts, verify them in a fresh bounded remediation, and return original to a new executor only after independent review.

Task: S00-020
Agent: auto-ci-cd-5a18c8aa1b42
Role: ci-cd
Action: claim
Status: blocked

Task title: Restore access to the pinned Linux XMPP experiment toolchain

state/blockers/S00-024.md

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+# Blocker S00-024
+
+- Original task: S00-020
+- Root task: S00-003
+- Reporter: auto-ci-cd-5a18c8aa1b42
+- Role: ci-cd
+- Original owner: auto-ci-cd-5a18c8aa1b42
+- Waits for user/external condition: False
+
+## Cause
+
+Previous runner session was interrupted before submit/escalate; processes stopped. User now explicitly requests resuming development. Preserve partial artifacts, verify them in a fresh bounded remediation, and return original to a new executor only after independent review.
+
+## One remediation outcome
+
+Устранить одну указанную причину прерывания и доказать готовность исходной задачи к новому запуску; не выполнять соседние задачи.
+
+## Evidence / reproduction
+
+See original handoff and task evidence.
+
+The reporting agent must stop now. A new agent implements only S00-024.