cleanup

modules/darwin/nix/default.nix

@@ -50,8 +50,9 @@
 
   nixpkgs = {
     config = {
-      cudaSupport = lib.mkDefault config.${namespace}.hardware.nvidia.enable;
-      rocmSupport = lib.mkDefault config.${namespace}.hardware.amd.enable;
+      # CUDA and ROCm are not applicable on Darwin; those hardware modules are
+      # NixOS-only.  Unfree allowance is handled globally via channels-config in
+      # the flake.
       allowUnsupportedSystem = true;
     };
   };