To do (Steam Machine edition)

Open

Check the live name after the next build: Hello's subtitle should say "Steamify CachyOS, based on CachyOS rolling" (steamify-customize.sh, run by mkarchiso after the packages; the airootfs copy of os-release is overwritten by a package).
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.

Live session (VM, --fremont): Vapor look and layout (Steam Deck wallpaper) at the live login; the power-off module is built for both ISO kernels and loaded at boot, in the VM it returns "No such device" (no AMDI0030 GPIO controller), as designed. Whether it keeps the real Steam Machine off is part of the hardware test.
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.