refactor: nix fmt classic to nix fmt

shells/README.md

@@ -15,7 +15,7 @@ nix develop        # or: nix develop .#default
 
 **Includes:**
 - Git
-- nixfmt-classic
+- nixfmt
 - uv (for `uvx` commands)
 
 **MCP helper:**

shells/ai-agent.nix

@@ -1,4 +1,9 @@
-{ pkgs, lib, customPkgs, ... }:
+{
+  pkgs,
+  lib,
+  customPkgs,
+  ...
+}:
 
 pkgs.mkShell {
   name = "ai-agent";

shells/ai-notebook.nix

@@ -1,7 +1,13 @@
-{ pkgs, lib, python ? pkgs.python312, ... }:
+{
+  pkgs,
+  lib,
+  python ? pkgs.python312,
+  ...
+}:
 
 let
-  pythonWithAI = python.withPackages (ps:
+  pythonWithAI = python.withPackages (
+    ps:
     let
       basePackages = with ps; [
         accelerate
@@ -25,12 +31,28 @@ let
         tokenizers
         transformers
       ];
-      linuxOnlyPackages = lib.optionals pkgs.stdenv.isLinux
-        (with ps; [ sentencepiece torch torchaudio torchvision ]);
-    in basePackages ++ linuxOnlyPackages);
-in pkgs.mkShell {
+      linuxOnlyPackages = lib.optionals pkgs.stdenv.isLinux (
+        with ps;
+        [
+          sentencepiece
+          torch
+          torchaudio
+          torchvision
+        ]
+      );
+    in
+    basePackages ++ linuxOnlyPackages
+  );
+in
+pkgs.mkShell {
   name = "ai-notebook";
-  packages = with pkgs; [ pythonWithAI uv git-lfs ruff pyright ];
+  packages = with pkgs; [
+    pythonWithAI
+    uv
+    git-lfs
+    ruff
+    pyright
+  ];
 
   shellHook = ''
     export UV_PYTHON="${pythonWithAI}/bin/python3"

shells/default.nix

@@ -8,15 +8,17 @@ let
   '';
 
   # Generate MCP configs for GUI applications
-  mcpConfigForGUI = pkgs.writeText "mcp_settings.json" (builtins.toJSON {
-    mcpServers = {
-      nixos = {
-        type = "stdio";
-        command = "${mcpNixosWrapper}/bin/mcp-nixos-wrapper";
-        args = [ ];
+  mcpConfigForGUI = pkgs.writeText "mcp_settings.json" (
+    builtins.toJSON {
+      mcpServers = {
+        nixos = {
+          type = "stdio";
+          command = "${mcpNixosWrapper}/bin/mcp-nixos-wrapper";
+          args = [ ];
+        };
       };
-    };
-  });
+    }
+  );
 
   # Script to install MCP configs for Claude Code and Codex
   installMcpConfigs = pkgs.writeShellScriptBin "install-mcp-configs" ''
@@ -83,12 +85,13 @@ let
     "$out_link/bin/nvim" "$@"
   '';
 
-in pkgs.mkShell {
+in
+pkgs.mkShell {
   name = "default";
   packages = with pkgs; [
     git
     nix
-    nixfmt-classic
+    nixfmt
     uv
     python3
     mcpNixosWrapper

shells/effect-ts.nix

@@ -93,7 +93,8 @@ let
         echo "  bun es list           - Browse Effect patterns"
   '';
 
-in pkgs.mkShell {
+in
+pkgs.mkShell {
   name = "effect-ts";
   packages = with pkgs; [
     bun

shells/go.nix

@@ -2,7 +2,13 @@
 
 pkgs.mkShell {
   name = "go";
-  packages = with pkgs; [ go gopls golangci-lint delve git ];
+  packages = with pkgs; [
+    go
+    gopls
+    golangci-lint
+    delve
+    git
+  ];
   shellHook = ''
     mkdir -p "$PWD/.cache/go" "$PWD/.cache/gomod"
     export GOPATH="$PWD/.cache/go"

shells/jupyter-notebook.nix

@@ -1,9 +1,13 @@
-{ pkgs, python ? pkgs.python312, ... }:
+{
+  pkgs,
+  python ? pkgs.python312,
+  ...
+}:
 
 let
   # Python environment with notebook tooling and core data-science libs
-  pythonWithNotebook = python.withPackages (ps:
-    with ps; [
+  pythonWithNotebook = python.withPackages (
+    ps: with ps; [
       altair
       ipykernel
       jupyterlab
@@ -15,10 +19,17 @@ let
       scipy
       scikit-learn
       seaborn
-    ]);
-in pkgs.mkShell {
+    ]
+  );
+in
+pkgs.mkShell {
   name = "jupyter-notebook";
-  packages = [ pythonWithNotebook pkgs.ruff pkgs.pyright pkgs.git ];
+  packages = [
+    pythonWithNotebook
+    pkgs.ruff
+    pkgs.pyright
+    pkgs.git
+  ];
   shellHook = ''
     export PYTHONNOUSERSITE=1
     export JUPYTER_CONFIG_DIR="''${XDG_CONFIG_HOME:-$HOME/.config}/jupyter"

shells/python-uv.nix

@@ -1,8 +1,17 @@
-{ pkgs, python ? pkgs.python312, ... }:
+{
+  pkgs,
+  python ? pkgs.python312,
+  ...
+}:
 
 pkgs.mkShell {
   name = "python-uv";
-  packages = [ python pkgs.uv pkgs.ruff pkgs.pyright ];
+  packages = [
+    python
+    pkgs.uv
+    pkgs.ruff
+    pkgs.pyright
+  ];
   shellHook = ''
     export UV_PYTHON="${python}/bin/python3"
     export UV_LINK_MODE=copy

shells/rust.nix

@@ -2,7 +2,13 @@
 
 pkgs.mkShell {
   name = "rust";
-  packages = with pkgs; [ cargo rustc rust-analyzer rustfmt clippy ];
+  packages = with pkgs; [
+    cargo
+    rustc
+    rust-analyzer
+    rustfmt
+    clippy
+  ];
   shellHook = ''
     mkdir -p "$PWD/.cache/cargo"
     export CARGO_HOME="$PWD/.cache/cargo"