Refactor: home-manager cross-platform + WGU software

- Split home config: sscoble.nix (shared macOS+NixOS) + desktop.nix (Hyprland)
- Added homeConfigurations.sscoble for work Mac (aarch64-darwin)
- Added home/wgu.nix: Zotero, Brave, Obsidian, VSCode, Typst, Bitwarden
- Mac: home-manager switch --flake .#sscoble
- NixOS: nixos-rebuild switch --flake .#laptop

flake.nix

@@ -1,5 +1,5 @@
 {
-  description = "Scobleclaw laptop — NixOS configuration reproducing MacBook software capabilities on x86_64";
+  description = "Scobleclaw — NixOS + home-manager configuration for personal laptop (x86_64) and work Mac (aarch64)";
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
@@ -14,27 +14,26 @@
   };
 
   outputs = { self, nixpkgs, home-manager, pi-mono, ... }@inputs: let
-    # System we're targeting (x86_64 NixOS laptop)
-    system = "x86_64-linux";
+    linuxSystem = "x86_64-linux";
+    darwinSystem = "aarch64-darwin";
 
-    pkgs = import nixpkgs {
-      inherit system;
+    # Linux pkgs with overlay (pi, qmd)
+    linuxPkgs = import nixpkgs {
+      system = linuxSystem;
       overlays = [ self.overlays.default ];
     };
   in {
-    # Overlay — add pi and qmd to nixpkgs
+    # === Overlay: pi + qmd (Linux only) ===
     overlays.default = final: prev: {
-      # pi coding agent — built from Forgejo mirror of pi-mono
       pi-coding-agent = final.buildNpmPackage {
         pname = "pi-coding-agent";
         version = "0.73.0";
         src = pi-mono;
-        npmDepsHash = "";  # Set after first build: nix-build outputs the correct hash
+        npmDepsHash = "";  # Fill after first build
         npmWorkspace = "packages/coding-agent";
         npmFlags = [ "--legacy-peer-deps" ];
         dontNpmBuild = true;
         preConfigure = ''
-          # Build dependencies first (monorepo workspace order)
           cd packages/ai && npm run build && cd ../..
           cd packages/agent && npm run build && cd ../..
           cd packages/tui && npm run build && cd ../..
@@ -55,38 +54,51 @@
         '';
       };
 
-      # qmd — vault search tool, wraps npm package via bun
       qmd = final.writeShellScriptBin "qmd" ''
         exec ${final.bun}/bin/bunx --bun @tobilu/qmd "$@"
       '';
-
-      # Pi config directory structure (without secrets)
-      pi-config-dir = final.runCommand "pi-config-dir" {} ''
-        mkdir -p $out
-        # Placeholder — real config should be restored from backup
-        echo "# Pi agent configuration" > $out/README.md
-        echo "# Defaults" > $out/settings.json
-      '';
     };
 
-    # NixOS configuration for the laptop
+    # === NixOS: full system + desktop ===
     nixosConfigurations.laptop = nixpkgs.lib.nixosSystem {
-      inherit system;
+      system = linuxSystem;
       modules = [
         home-manager.nixosModules.home-manager
         ./modules/laptop.nix
         ./modules/hyprland.nix
         {
-          home-manager.useGlobalPkgs = true;
-          home-manager.useUserPackages = true;
-          home-manager.users.sscoble = import ./home/sscoble.nix;
+          home-manager = {
+            useGlobalPkgs = true;
+            useUserPackages = true;
+            users.sscoble = {
+              imports = [
+                ./home/sscoble.nix
+                ./home/desktop.nix
+                ./home/wgu.nix
+              ];
+            };
+          };
         }
       ];
     };
 
-    # Standalone dev shell for trying things out
-    devShells.${system}.default = pkgs.mkShell {
-      buildInputs = with pkgs; [
+    # === macOS: home-manager standalone (no desktop, no Hyprland) ===
+    homeConfigurations.sscoble = home-manager.lib.homeManagerConfiguration {
+      pkgs = nixpkgs.legacyPackages.${darwinSystem};
+      modules = [
+        ./home/sscoble.nix
+        ./home/wgu.nix
+        {
+          # macOS-specific overrides
+          home.homeDirectory = "/Users/sscoble";
+          # pi/qmd come from homebrew, not nixpkgs
+        }
+      ];
+    };
+
+    # === Dev shell (Linux) ===
+    devShells.${linuxSystem}.default = linuxPkgs.mkShell {
+      buildInputs = with linuxPkgs; [
         pi-coding-agent
         qmd
         nodejs
@@ -95,12 +107,11 @@
         zsh
       ];
       shellHook = ''
-        echo "🦞 Scobleclaw laptop dev shell"
+        echo "🦞 Scobleclaw dev shell"
         echo "  pi:      $(which pi)"
         echo "  qmd:     $(which qmd)"
         echo "  node:    $(node --version)"
         echo "  bun:     $(bun --version)"
-        echo "  git:     $(git --version)"
       '';
     };
   };