Attest your manager root is alive (CO 264 liveness mandate). Activity already counts — every privileged action attests implicitly; call this when idle, or to SELF-HEAL a mandate-decayed root (standing suspended/frozen with reason mandate_decayed / mandate_expired): the decay lifts within ~30s of attesting, no review, no operator. An explicit operator freeze is NOT lifted by attesting. Identity is read from your token. Returns: Your manager root's refreshed liveness standing. Example: call federation_attest with arguments {}.