Initial: Nix flake reproducing MacBook capabilities on x86_64 NixOS

- pi coding agent (from sscoble/pi-mono Forgejo mirror)
- qmd vault search (via bunx @tobilu/qmd)
- zsh + oh-my-zsh + developer tooling
- home-manager config for sscoble user
- Forgejo Action to check pi version drift daily

flake.nix

@@ -0,0 +1,106 @@
+{
+  description = "Scobleclaw laptop — NixOS configuration reproducing MacBook software capabilities on x86_64";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    home-manager = {
+      url = "github:nix-community/home-manager";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    pi-mono = {
+      url = "git+https://os.scoble.me/forgejo/sscoble/pi-mono.git";
+      flake = false;
+    };
+  };
+
+  outputs = { self, nixpkgs, home-manager, pi-mono, ... }@inputs: let
+    # System we're targeting (x86_64 NixOS laptop)
+    system = "x86_64-linux";
+
+    pkgs = import nixpkgs {
+      inherit system;
+      overlays = [ self.overlays.default ];
+    };
+  in {
+    # Overlay — add pi and qmd to nixpkgs
+    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
+        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 ../..
+          cd packages/coding-agent && npm run build && cd ../..
+        '';
+        installPhase = ''
+          runHook preInstall
+          mkdir -p $out/lib/node_modules/@mariozechner/pi-coding-agent
+          cp -r packages/coding-agent/dist $out/lib/node_modules/@mariozechner/pi-coding-agent/
+          cp packages/coding-agent/package.json $out/lib/node_modules/@mariozechner/pi-coding-agent/
+          mkdir -p $out/bin
+          cat > $out/bin/pi <<'EOF'
+          #!/usr/bin/env bash
+          exec ${final.nodejs}/bin/node $out/lib/node_modules/@mariozechner/pi-coding-agent/dist/cli.js "$@"
+          EOF
+          chmod +x $out/bin/pi
+          runHook postInstall
+        '';
+      };
+
+      # 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" > $out/settings.json
+      '';
+    };
+
+    # NixOS configuration for the laptop
+    nixosConfigurations.laptop = nixpkgs.lib.nixosSystem {
+      inherit system;
+      modules = [
+        home-manager.nixosModules.home-manager
+        ./modules/laptop.nix
+        {
+          home-manager.useGlobalPkgs = true;
+          home-manager.useUserPackages = true;
+          home-manager.users.sscoble = import ./home/sscoble.nix;
+        }
+      ];
+    };
+
+    # Standalone dev shell for trying things out
+    devShells.${system}.default = pkgs.mkShell {
+      buildInputs = with pkgs; [
+        pi-coding-agent
+        qmd
+        nodejs
+        bun
+        git
+        zsh
+      ];
+      shellHook = ''
+        echo "🦞 Scobleclaw laptop dev shell"
+        echo "  pi:      $(which pi)"
+        echo "  qmd:     $(which qmd)"
+        echo "  node:    $(node --version)"
+        echo "  bun:     $(bun --version)"
+        echo "  git:     $(git --version)"
+      '';
+    };
+  };
+}