feat: the Linux lab VM can run a desktop, driven over SSH like the Windows lab

`up --desktop` adds Xvfb under openbox with xdotool, xclip, maim, AT-SPI and
lavapipe, and the one-linux MCP gains linux_exec, linux_shot, linux_ui,
linux_spawn, linux_put and linux_get, mirroring the Windows tools.

Assisted-by: claude-opus-5.5
cc25073ba7clover caruso committed on 10/4/2026, 12:39:00 AMparent0aa624e
4 files changedLine totals unavailable