fix: resolve evaluation purity, missing packages, and brittle paths

flake.nix

@@ -32,12 +32,28 @@
       url = "github:abenz1267/walker";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    makima = {
+      url = "github:fujiapple86/makima";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = { self, nixpkgs, nixos-hardware, disko, impermanence, home-manager, nix-colors, stylix, walker, ... } @ inputs: let
+  outputs = { self, nixpkgs, nixos-hardware, disko, impermanence, home-manager, nix-colors, stylix, walker, makima, ... } @ inputs: let
+    # Overlays
+    overlays = [
+      (final: prev: {
+        makima-bin = makima.packages.${prev.system}.default;
+        nomarchy-system-scripts = final.callPackage ./core/system/scripts-derivation.nix { };
+      })
+    ];
+
     # Helper to create standalone home configurations
     mkHome = { username, modules ? [] }: home-manager.lib.homeManagerConfiguration {
-      pkgs = nixpkgs.legacyPackages.x86_64-linux;
+      pkgs = import nixpkgs {
+        inherit (nixpkgs.legacyPackages.x86_64-linux) system;
+        inherit overlays;
+        config.allowUnfree = true;
+      };
       extraSpecialArgs = { inherit inputs; };
       modules = [
         ./features
@@ -67,7 +83,10 @@
       installerIso = nixpkgs.lib.nixosSystem {
         specialArgs = { inherit inputs; };
         modules = [
-          { nixpkgs.hostPlatform = "x86_64-linux"; }
+          { 
+            nixpkgs.hostPlatform = "x86_64-linux";
+            nixpkgs.overlays = overlays;
+          }
           "${nixpkgs}/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix"
           ./hosts/installer-iso.nix
           {
@@ -84,7 +103,10 @@
           homeActivationPackage = homeConfigs."nixos".activationPackage;
         };
         modules = [
-          { nixpkgs.hostPlatform = "x86_64-linux"; }
+          { 
+            nixpkgs.hostPlatform = "x86_64-linux";
+            nixpkgs.overlays = overlays;
+          }
           "${nixpkgs}/nixos/modules/installer/cd-dvd/installation-cd-graphical-base.nix"
           ./hosts/live-iso.nix
           ./core
@@ -103,7 +125,10 @@
           homeActivationPackage = homeConfigs."nomarchy".activationPackage;
         };
         modules = [
-          { nixpkgs.hostPlatform = "x86_64-linux"; }
+          { 
+            nixpkgs.hostPlatform = "x86_64-linux";
+            nixpkgs.overlays = overlays;
+          }
           ./core/default.nix
           ./core/system/vm-guest.nix
           {