auth/totp.ts per 08 §2.4: RFC 6238 (HMAC-SHA1, 30 s, 6 digits, ±1 step) with node:crypto only, checked against the RFC's test vectors. Migration 0003: users.totp_recovery_hashes and totp_last_step. Admins turn it on from My account (the header's "Account"): scan the QR or type the key, confirm a code, get 10 recovery codes once. Login asks for the code only after the password is right (401 totp_required, no session); a wrong code is a failed login (rate limit, audit). A step signs in once (totp_last_step updated atomically) and a recovery code once (array_remove guarded by any()). Off and new codes need the password; another admin can turn it off for a lost phone, which signs that user out. Users list shows it (twoStep). Also, found by the full e2e chain on one shared database: - Linphone tokens: only the exact token issued is accepted. The last base64 character can carry ignored bits, so another spelling decoded to the same signed token. - Test scripts no longer assume a fresh system: m3-t3 picks Dan in the test box, m8-check dials whatever slot the park took (findslot = next), m10-t4 uses the admin's existing extension, m11-t1 clears the public IP on its own first (local nets are in the transports while one is set, and transports change only on a restart). e2e m11-t1-totp; the full chain M1-M11 (33 scripts) passes. Task: M11-T1