remove home-manager module from nix-darwin

this fixes the starship errors when rebuilding nix-darwin

lib/default.nix

@@ -179,22 +179,20 @@ lib
     inputs.darwin.lib.darwinSystem {
       inherit system specialArgs;
       modules = [
-        inputs.home-manager.darwinModules.home-manager
         inputs.mac-app-util.darwinModules.default
         {
           imports = (nixFiles ../platforms/nix-darwin);
           nixpkgs.pkgs = pkgsBySystem.${system};
         }
-        module
+        # Home Manager is intentionally NOT activated here. It is managed
-        {
+        # standalone via `nh home switch` (see homeConfigurations, extracted
-          home-manager = {
+        # from the host module's `home-manager.users`). Strip that attr so
-            extraSpecialArgs = {
+        # darwin-rebuild doesn't also activate a second, divergent HM
-              inherit colorscheme;
+        # generation with different store paths (useUserPackages puts packages
-            }
+        # in /etc/profiles/per-user vs. ~/.nix-profile standalone) -- that
-            // specialArgs;
+        # mismatch broke the prompt after every darwin-rebuild until the next
-          }
+        # `nh home switch`.
-          // homeModule.home-manager;
+        (builtins.removeAttrs module [ "home-manager" ])
-        }
       ];
     };