VM test showed: boot menu (TANINUX branding ✓), root autologin ✓, motd ✓,
then cage failed: libseat 'Could not connect to /run/seatd.sock'. The getty
autologin has no logind seat, so run seatd in the live (disabled on the target,
where greetd uses logind). qt6-wayland so calamares (Qt) runs under cage.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>