sbx 0.29 isolated the agent with --branch, creating a host-side Git worktree.
0.37 removed that flag and reinstated --clone, which gives the agent a private
in-container clone mounted read-only and exposes its commits through a
sandbox-<name> git remote on the host. Setup fails outright against 0.37 with
'--branch is no longer supported'.
Drops the branch name plumbing entirely, since the sandbox now owns the clone
and there is no host branch to name.
Documents the two host prerequisites this surfaced: membership of the kvm
group, because sandboxes are microVMs, and the docker-sbx package rather than
docker-sandbox-bin on Arch derivatives - the latter installs only the CLI,
omitting the microVM kernel, rootfs and nerdbox shim, which makes sbx fall back
to mounting filesystems on the host and fail for any non-root user.
mroberts
4af8c1c153