S00-003: Record blocked task and remediation handoff

Changes: Preserve incomplete work and blocker metadata for S00-003. This checkpoint does not mark implementation accepted.
Validation: Session ended with status blocked.
Blocker: S00-003 cannot attest parser limits: Stanza 12.22.1 exposes no resource bounds and its persistent WebSocket parser accepts large/deep XML and reassembles incomplete documents across separate input messages.

Task: S00-003
Agent: auto-protocol-902594b44429
Role: protocol
Action: claim
Status: blocked

Task title: Проверить XMPP WSS/auth библиотеку

planning/tasks/S00-003.md

@@ -5,7 +5,7 @@
 - Этап: S00
 - Оператор: protocol
 - Reviewer: qa
-- Зависимости: S00-001, S00-002, S00-017
+- Зависимости: S00-001, S00-002, S00-017, S00-018
 - Требования: ACC-004, NET-003, NET-004
 
 ## Один результат