To do (Steam Machine edition)

Open

Test the live session after the next build (build-live-modules.sh runs in the container before buildiso.sh): Vapor look and layout at the live login, lsmod | grep steamify in the live session (on the Steam Machine it loads; in the VM with --fremont too), and shutting down from the live session on the real Steam Machine stays off.
Steamify PR: feat/defaults-mode (2.6.0, b948c20) in steamify-cachyos, pushed, no PR yet (checked 2026-09-27: not on main, newest release v2.5.2). Ready: open it; the user merges (never commit to main). The ISO's first-login step needs 2.6.0 released.
Test on the real Steam Machine from a USB stick (gamescope, LEDs, CEC, power-off) before calling the ISO usable.

Regression test 2.6.0 on an existing desktop install (test VM from ssh-ready, --fremont): full first run, re-apply, notifications/CEC/theme off and on again. No errors; user units enabled and running, theme applied and restored live, no first-login autostart with a session.
ISO name: steamify-cachyos-<date>-x86_64.iso (iso_name in archiso/profiledef.sh); the volume label stays COS_<yyyymm>.
VM install from the ISO (2026-09-27, f42859a): a VM install from the ISO (Hello's Install, no manual fixes) ran Steamify's step: every component OK, exit: 0, SDDM autologin into gamescope. First desktop login (session switched to plasma in the VM) passed too: Vapor layout, the app opened with everything on. The first-login script runs the newest release, so it only works once 2.6.0 is released (in the test it was pointed at the bundle). The VM's text console doesn't show (virgl): read the installed disk with qemu-nbd -r + mount -o ro,rescue=nologreplay,subvol=@ (logs in @log).

Steamify wizard pages in the installer, before anything is installed: the same choices as Steamify's menu (conversion, boot into gamescope or desktop, theme, Deck icons, single user, shortcut + non-Steam game, notifications, VRAM booster, HDMI-CEC, Steam Machine support + power-off fix), defaults ticked like a first run. A Calamares page (netinstall-style YAML or a QML module in the show sequence) stores the ticked ids in global storage; steamify-install passes them to steamify.sh --backend apply <ids> (--boot gamescope|desktop) instead of --defaults.
Branding: the live session's os-release says "Steamify, based on CachyOS" (Hello's subtitle); Hello's window title and the boot menu still say CachyOS. Check with the CachyOS team.
Release: a CI job that builds the ISO (privileged container, flags from the steam-machine-iso skill) and hosts it (>2 GB, not a GitHub release asset).
Drop the Boost 1.91 workaround in steamify-prepare.sh once cachyos-calamares-next is rebuilt against the repos' Boost.

Build and test details: the steam-machine-iso skill in steamify-cachyos-dev.