Upgrade testing catches wallpaper loss and boot stalls

emirb introduced and merged an upgrade-and-reboot test into the ISO repository's quattro branch. It starts from a signed release ISO and checks the experience of an existing installation moving to edge or rc, including migrations, reboot recovery, desktop startup and wallpaper preservation. github-actions[bot] reported an initial 4.0.4-to-edge run with 10 of 11 checks passing and the wallpaper check failing. omacom/omarchy-iso#248:issuecomment-6089979558

A subsequent committed change requires the Omarchy package version to change, preventing a successful reboot with no upgrade from passing as an upgrade test. It also retries competing screenshot-branch pushes. Separately, quattro received the wallpaper-link repair and emirb's boot fix, which prevents systemd from waiting for a console-size response while Plymouth holds the terminal. The reported boot-frequency measurements belong to the commit author. omacom/omarchy-iso@d6a32f0dcf39 omacom/omarchy@187a145ad555 omacom/omarchy@f03bf06742a2