pve hardcodes egl-headless with no rendernode, and the nvidia egl vendor
outranks mesa, so virgl lands on llvmpipe.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
vga: virtio-gl, serial0 and ovmf are load-bearing and live only on the
hypervisor, so a rebuilt vm would regress silently.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>