S00-003: Approve bounded XMPP selection after independent WSS and SCRAM checks

Changes: Accept ADR 0002 for pinned Stanza with mandatory bounded transport, verified SASL and SHA512 composition; record independent review findings and handoff with external limits retained.
Validation: Fresh-cache pinned npm ci and browser build succeeded; all 112 tests passed. Verified 51 locked entries, 26 installed notices and 340 unchanged vendor files; six offer permutations and six adversarial XML checks passed; make check passed 72 tooling tests. No actual browser, independent full XMPP server/client, OMEMO or release readiness acceptance.

Task: S00-003
Agent: auto-qa-d49749753ac6
Role: qa
Action: review
Status: done

Task title: Проверить XMPP WSS/auth библиотеку

planning/stages/S00.md

@@ -8,7 +8,7 @@
 
 - [S00-001](../tasks/S00-001.md): Утвердить Web-профиль — orchestrator; done.
 - [S00-002](../tasks/S00-002.md): Выбрать framework и build runtime — orchestrator; done.
-- [S00-003](../tasks/S00-003.md): Проверить XMPP WSS/auth библиотеку — protocol; review.
+- [S00-003](../tasks/S00-003.md): Проверить XMPP WSS/auth библиотеку — protocol; done.
 - [S00-004](../tasks/S00-004.md): Проверить browser OMEMO backend — crypto; blocked.
 - [S00-005](../tasks/S00-005.md): Выбрать IndexedDB wrapper и migration policy — storage; todo.
 - [S00-006](../tasks/S00-006.md): Зафиксировать browser/reference matrix — orchestrator; todo.