- status lists every Home Manager user service instead of a hardcoded
docker.service (that's not a steam-frame-nix module)
- unique backup suffix per run (Home Manager aborts if *.backup exists)
- uninstall only force-kills processes still running from /nix/store
- drop fallbacks this installer never needs: old `nix show-config` /
`nix store ping`, the legacy per-user HM profile path, a PATH fallback,
grep-parsing the receipt without jq, `--flake=value`
install.sh installs Nix (nix-installer, steam-deck planner, flakes
enabled) and activates a Home Manager configuration, creating one from
the new flake template if there is none; uninstall stops Home Manager's
user services, runs home-manager uninstall and removes Nix and per-user
leftovers; status shows the current state. Works piped from curl.