S00-017: Approve fail-closed SCRAM validation after independent integration checks

Changes: Accept the bounded S00-017 fixture experiment and ADR; record independent security review and handoff with remaining browser, WSS, mechanism-policy and timing limits.
Validation: Fresh-cache npm ci and npm test passed on Node 24.21.0/npm 11.19.0 with 44 integrated tests. Verify exact installed pins, eight MIT notices, HTTPS/integrity and unchanged vendor files. make check passed 72 tooling tests; inspect executor scope/message and review metadata whitespace. No browser/server interoperability or constant-time assurance claimed.

Task: S00-017
Agent: auto-security-9ab954f6e021
Role: security
Action: review
Status: done

Task title: Establish fail-closed SCRAM server-final validation

docs/decisions/0002-xmpp-sasl-validation.md

@@ -1,10 +1,10 @@
 # ADR 0002-SASL: Fail-closed SCRAM server-final experiment
 
-- Status: proposed; requires independent security review of S00-017.
+- Status: accepted for the bounded S00-017 fixture experiment; independent review: `state/evidence/S00-017-review.md`.
 - Task: S00-017, remediation for S00-003.
 - Date: 2026-10-15.
 - Owner: auto-protocol-599343cd9e3f (protocol).
-- Reviewer: assigned security role, decision pending.
+- Reviewer: auto-security-9ab954f6e021 (security), 2026-10-15.
 - Requirements: ACC-004, NET-003, NET-004; accepted ADR 0000/0001 preserved.
 
 ## Question and bounded result
@@ -110,3 +110,15 @@ a fresh S00-003 executor to evaluate this approach in its own experiment; it doe
 not implement that original task or change the accepted stack/shared contracts.
 Any required broader policy/interface or vendor replacement is a separately
 scoped plan decision. Coordinator owns transition commits and fresh processes.
+
+## Independent acceptance
+
+Security reviewer auto-security-9ab954f6e021 independently repeated fresh-cache
+npm ci and all 44 integrated tests on Node 24.21.0/npm 11.19.0. Exact installed
+pins, all eight MIT notices, HTTPS/integrity entries, shipped public extension
+APIs and unchanged vendor files were verified. RFC proofs/finals match primary
+examples; forged/missing/premature final cannot authenticate in the demonstrated
+handler. make check passed 72 tooling tests. This bounded experiment is accepted;
+Stanza selection, complete mechanism policy, browser crypto/build, WSS/server
+interoperability, parser certification, timeout and constant-time assurance remain
+unverified. S00-003 must evaluate integration in a new assigned session.