- Menu detects what is on and applies only the changes: SteamOS
conversion, SteamOS theme, Steam Deck/Machine icons, single user mode,
and Steam Machine support (only on Fremont hardware)
- Everything is reversible: KDE settings go through an undo journal
(lib/state.sh), system files are restored from their backups
- Steam Machine support: LED driver, udev rule giving the user the LED
files, steamos-manager for Steam's hardware settings; OpenRGB dropped
- Edit Plasma files only while plasmashell is stopped so it can't
overwrite them
- README and AGENTS.md describe the menu, the component model and the
test environment
