nixpkgs carries stasis 1.5.1, so the pinned input and pkgs/stasis.nix go. It ships no unit and has no NixOS module, so modules/services.nix keeps declaring one; its actions run as `sh -lc` and it spawns niri and pactl directly, hence the unit path. stasis prefers a user config over /etc and generates its own when none exists, so moonarch's is seeded into the home directory instead of only reaching /etc.