The backup-restore from the x86 instance left Core stopped with the
Supervisor idle and healthy-looking — no restart, download, or disk
activity, and it survived a guest reboot. The old config was minimal,
so: fresh 18.1 image, configure from scratch (old disk kept aside as
*.old-restored). Add VNC graphics + virtio-gpu while the domain was
down: the HAOS CLI runs only on the graphical console (no serial
getty), so without this there is no way into a broken guest — view it
via Cockpit's Virtual Machines page (cockpit-machines now installed).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>