Fixes 5 HIGH, 16 MEDIUM, 14 LOW, 8 INFO findings across 7 phases: - Token revocation blacklist via jti claims in SQLite (H-2) - Session endpoint auth hardening with gateway token validation (H-1) - Refresh token scope validation per RFC 6749 Section 6 (M-9) - Removed plain PKCE from OIDC discovery, S256-only (H-3) - Passkey challenges moved from in-memory to SQLite (M-4) - TOTP replay protection via absolute period tracking (M-5) - Email verification lockout after 5 failed attempts (M-8) - OAuth PDS sessions moved from in-memory to SQLite (L-1) - AES-256-GCM IV migration (16->12 bytes) with HKDF key derivation (L-3/L-4) - JWT kid fallback hardened - reject when kid present but not found (L-2) - WebAuthn requireUserVerification enforced (M-2) - Webhook HTML escaping for XSS prevention (M-7) - CSP form-action directive added (M-6) - Recovery scope restricted to openid/profile/email (L-7) - Cache-Control: no-store on token info endpoint (M-1) - Docker image SHA pinning, compose security hardening (D-2/D-3) - CI kubeconfig cleanup with mktemp+trap (D-1) - Rust lib: zeroize secrets on drop, RwLock poison recovery, removed unused postgres deps, pinned chrono, upgraded rusqlite - OIDC presets: pkce_note documentation for disabled PKCE clients 423 tests passing, 0 npm vulnerabilities. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>