refactor(koumakyou): clean up jovian config

spec/koumakyou/default.nix

@@ -1,4 +1,4 @@
-{ pkgs, lib, config, ... }: {
+{ pkgs, lib, config, jovian, ... }: {
   global = {
     id = "0a920a834b5f480bab258040096d4c6e";
     fs.esp.uuid = "ACB3-4AFF";
@@ -41,11 +41,8 @@
   console.earlySetup = true;
 
   specialisation.desktop.configuration = {
-    programs.regreet.enable = lib.mkForce true;
-    jovian.steam.autoStart = lib.mkForce false;
-    jovian.steam.desktopSession = lib.mkForce "sway";
-    jovian.decky-loader.enable = lib.mkForce false;
-    home.plasma.enable = lib.mkForce false;
+    global.jovian = false;
+    jovian.steamos.useSteamOSConfig = false;
     services.greetd.settings.default_session.command = let
       cfg = config.programs.regreet;
     in "${pkgs.dbus}/bin/dbus-run-session ${lib.getExe pkgs.cage} ${lib.escapeShellArgs cfg.cageArgs} -- ${pkgs.writeShellScript "cageResolution" ''
@@ -67,5 +64,8 @@
   boot.extraModulePackages = [ ];
   hardware.cpu.intel.updateMicrocode = true;
 
-  imports = [ ./jovian.nix ];
+  imports = [
+    jovian.nixosModules.jovian
+    ./jovian.nix
+  ];
 }

spec/koumakyou/jovian.nix

@@ -1,12 +1,11 @@
-{ pkgs, lib, config, jovian, ... }: {
-  imports = [
-    jovian.nixosModules.jovian
-  ];
+{ pkgs, lib, config, ... }: with lib; {
+  options.global.jovian = mkEnableOption "set up Jovian NixOS" // { default = true; };
 
+  config = mkIf config.global.jovian {
     jovian = {
       hardware.has.amd.gpu = true;
       steamos.useSteamOSConfig = true;
-    steamos.enableDefaultCmdlineConfig = false;
+      #steamos.enableDefaultCmdlineConfig = false;
 
       steam = {
         enable = true;
@@ -49,42 +48,19 @@
       user = "app";
     };
 
-  jovian.decky-loader = let
-    adjustor = pkgs.python3.pkgs.buildPythonApplication rec {
-      pname = "adjustor";
-      version = "2.1.5";
-      pyproject = true;
-
-      src = pkgs.fetchFromGitHub {
-        owner = "hhd-dev";
-        repo = pname;
-        rev = "v${version}";
-        hash = "sha256-KgeK2lC3b9VbjYmy7rD/ImODWDDx3pWIzWgNnSLJeDs=";
-      };
-
-      propagatedBuildInputs = with pkgs.python3.pkgs; [
-        setuptools
-        pyroute2
-        rich
-      ];
-
-      # This package doesn't have upstream tests.
-      doCheck = false;
-    };
-  in {
+    jovian.decky-loader = {
       # ~/.steam/steam/.cef-enable-remote-debugging
       enable = true;
       user = "app";
       extraPackages = with pkgs; [
-      curl unzip util-linux gnugrep procps pciutils kmod
-      ryzenadj # adjustor
+        curl unzip util-linux gnugrep procps pciutils kmod ryzenadj
       ];
       extraPythonPackages = pythonPackages: with pythonPackages; [
         hid pyyaml
-      # adjustor
       ];
       stateDir = "/nix/persist/decky";
     };
 
-  boot.kernelParams = lib.mkIf config.jovian.decky-loader.enable [ "iomem=relaxed" "amd_pstate=passive" ];
+    boot.kernelParams = [ "iomem=relaxed" "amd_pstate=passive" ];
+  };
 }