`ci vmware` runs as ci-runner and relies on host-based X auth (xhost),
but the grant is per-session and wiped on logout / X restart, so the GUI
launch fails with "cannot open X display" after every desktop relogin.
Add scripts/install-vmware-gui-access.sh: installs an XDG autostart entry
in the desktop user's home that re-applies `xhost +SI:localuser:ci-runner`
at each graphical login, and applies it immediately when a display is
reachable. Desktop user resolves from --desktop-user / $CI_DESKTOP_USER /
$SUDO_USER (never root); service user from $CI_RUN_USER. --uninstall
removes the autostart entry and revokes the live grant.
Wire it into setup-host-linux.sh as Step 8, with --desktop-user (default
$SUDO_USER) and --skip-gui-access for headless hosts.
