added checks and formatting pre-commit hooks

flake.nix

@@ -1,12 +1,54 @@
 {
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-25.11";
+    systems.url = "github:nix-systems/default";
+    git-hooks.url = "github:cachix/git-hooks.nix";
   };
 
   outputs =
-    { self, nixpkgs }:
     {
-      # hydraJobs = nixpkgs.lib.mapAttrs (_: value: value.config.system.build.toplevel) self.nixosConfigurations;
+      self,
+      systems,
+      nixpkgs,
+      ...
+    }@inputs:
+    let
+      forEachSystem = inputs.nixpkgs.lib.genAttrs (import systems);
+    in
+    {
+      formatter = forEachSystem (
+        system:
+        let
+          pkgs = inputs.nixpkgs.legacyPackages.${system};
+        in
+        pkgs.treefmt
+      );
+
+      checks = forEachSystem (system: {
+        pre-commit-check = inputs.git-hooks.lib.${system}.run {
+          src = ./.;
+          hooks = {
+            treefmt.enable = true;
+            treefmt.settings.formatters = [ inputs.nixpkgs.legacyPackages.${system}.nixfmt ];
+            statix.enable = true;
+            deadnix.enable = true;
+            nil.enable = true;
+          };
+        };
+      });
+
+      devShells = forEachSystem (system: {
+        default =
+          let
+            pkgs = nixpkgs.legacyPackages.${system};
+            inherit (self.checks.${system}.pre-commit-check) shellHook enabledPackages;
+          in
+          pkgs.mkShell {
+            inherit shellHook;
+            buildInputs = enabledPackages;
+          };
+      });
+
       nixosConfigurations = {
         vm = nixpkgs.lib.nixosSystem { modules = [ ./systems/vm/configuration.nix ]; };
       };