Full client-side crypto (PBKDF2/Argon2id master key, HKDF stretch, AES-256-CBC+HMAC encstrings), password grant with TOTP 2FA, sync, list/get/env/set/rm. Containerized (alpine, non-root), CI = gofmt/vet/ build/secret-scan, compose service ukrrs-secretsmgr-cli. Rust-era scripts archived. Live-validated against pwvault.turnsys.com. Ticket: https://projects.knownelement.com/issues/832
