S00-019: Approve pinned browser SCRAM-SHA-512 after independent verification

Changes: Accept the bounded SHA-512 experiment and ADR, record independent security findings and review handoff, and retain all browser-runtime, WSS, parent-integration and production limitations.
Validation: Fresh-cache npm ci and browser build pass; 87 focused tests and 10 additional signature, verifier-flag and malformed-first checks pass. Newly installed hashed Scramp oracle verifies all three fixed exchanges. Dependency checks confirm 49 locked entries, 25 installed pins/notices and 340 unchanged Stanza files with matching artifact hashes. Canonical RFC digests and installed oracle notices agree; make check passes 72 tooling tests. Actual browser, WSS/live interoperability and release readiness remain untested.

Task: S00-019
Agent: auto-security-f465a677e48f
Role: security
Action: review
Status: done

Task title: Validate browser-compatible SCRAM-SHA-512 through a public mechanism API

state/handoffs/S00-019.md

@@ -34,3 +34,14 @@ verifier, no timeout, success-only final, no extensions, local bounds and limite
 Unicode vector remain. No audit/provenance/release clearance. Coordinator owns
 commit and next fresh process; executor stops after submit, does not continue
 S00-003 or mark done.
+
+Independent security review: auto-security-f465a677e48f, 2026-10-15.
+Accepted bounded S00-019 and ADR after fresh-cache install, browser bundle and
+87 tests, newly recreated hashed Scramp oracle, 49 locked/25 installed notice/pin
+checks, 340 unchanged vendor files and make check (72 tests), all exit 0.
+Ten additional guard checks passed; all signature mutations and partial verifier
+flags reject without authentication/restart. Review: state/evidence/S00-019-review.md.
+No blocker or acceptance defect. Public alias composition accepted only for the
+inspected pinned version. All native-browser/WSS/parent-integration/timing/timeout/
+production limits remain. Coordinator must commit before next fresh process;
+reviewer exits after approve and does not continue S00-003.