Integrate VirtualBox as a local facility rather than a shared-PTY backend: a
Windows guest has no shell to relay, so the honest fit is launching the VM's
GUI on the caller's own machine (the "share a VM, run it locally" path) — no
display is relayed to the room, so zero-knowledge is untouched.
- ensure-vbox.sh: detect-first installer mirroring ensure-docker.sh; --check,
--plan (real apt --simulate download plan, no changes), --yes; apt/dnf/
pacman/brew/winget; Secure Boot MOK warning. HH_VBOX_FORCE_MISSING lets a
demo exercise the missing->install path without uninstalling.
- sbx.rs: vbox_installed/vbox_version/list_vms/vm_running/gui_launch +
ensure_vbox_install.
- app.rs: /sbx vms (detect + list) and /sbx gui <vm> [--install] (detect-first
then startvm --type gui); /sbx launch virtualbox steers to /sbx gui.
- ui.rs help: /sbx vms and /sbx gui entries.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
