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 reproduce accepted Node 24.21.0/npm 11.19.0 or install locked Stanza: host tools are 24.1.0/11.3.0, parent node_modules is absent, and normal official HTTPS retrieval fails with unresolved configured proxy.

Task: S00-003
Agent: auto-protocol-59f4d359b339
Role: protocol
Action: claim
Status: blocked

Task title: Проверить XMPP WSS/auth библиотеку

planning/ROADMAP.md

@@ -6,7 +6,7 @@
 
 Зафиксировать Web scope, browser targets и проверенные кандидаты, не устанавливая непроверенный framework по догадке.
 
-Задач: 19; entry: нет; exit: S00-010.
+Задач: 20; entry: нет; exit: S00-010.
 
 ## [S01: Предметные контракты](stages/S01.md)