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

state/blockers/S00-018.md

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+# Blocker S00-018
+
+- Original task: S00-003
+- Root task: S00-003
+- Reporter: auto-protocol-902594b44429
+- Role: protocol
+- Original owner: auto-protocol-902594b44429
+- Waits for user/external condition: False
+
+## Cause
+
+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.
+
+## One remediation outcome
+
+One isolated runnable and independently reviewed ingress experiment enforces explicit finite XML resource limits and standalone text XML per WebSocket message before unsafe accumulation/import, through a supported library integration path.
+
+## Evidence / reproduction
+
+Run the pinned Node command in state/evidence/S00-003-auto-protocol-902594b44429.md: parser-probe/reproduce.mjs exits 0 after observing acceptance of a 1 MiB body, depth 256, and unfinished XML retained across 18 writes. Inspect stanza/transports/websocket.js and jxt/StreamParser.d.ts for absent per-message completeness/resource-limit enforcement.
+
+The reporting agent must stop now. A new agent implements only S00-018.