v0.18.0 - Add the `pibox` host wrapper and installer with persistent Pi, pibox state, and SSH directories. - Add managed installation into a caller-selected wrapper directory without replacing existing SSH keys. - Add nested box launches with host-path propagation, sibling wrapper mounts, and shared `AICODEBOX_ENV_*` and `AICODEBOX_MOUNT_*` settings. - Download the installed wrapper from the matching immutable release tag.