feat: auto-update Claude Code from nixpkgs-unstable

- Add nixpkgs-unstable input for latest Claude Code versions
- Remove duplicate home-manager config from configuration.nix (handled by flake)
- Remove fetchTarball/fetchGit calls incompatible with pure flake mode
- Add shell function to auto-update unstable on nixos-rebuild

configuration.nix

@@ -2,27 +2,13 @@
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running 'nixos-help').
 
-{ config, pkgs, ... }:
+{ config, pkgs, pkgs-unstable, ... }:
 
-let
-  # Fetch home-manager
-  home-manager = builtins.fetchTarball {
-    url = "https://github.com/nix-community/home-manager/archive/release-25.11.tar.gz";
-  };
-
-  # Fetch kickstart-nvim
-  kickstart-nvim = builtins.fetchGit {
-    url = "https://github.com/0xWheatyz/kickstart.nvim";
-    ref = "master";
-  };
-in
 {
-  imports =
-    [ # Include the results of the hardware scan.
-      ./hardware-configuration.nix
-      # Import home-manager module
-      (import "${home-manager}/nixos")
-    ];
+  imports = [
+    ./hardware-configuration.nix
+    # home-manager is imported via flake.nix
+  ];
 
  ## Commented out as defined at the end of the page
 
@@ -121,7 +107,7 @@ in
     code-cursor
     adwaita-icon-theme
     obsidian
-    claude-code
+    pkgs-unstable.claude-code  # Use unstable for latest version
   ];
 
   # Some programs need SUID wrappers, can be configured further or are
@@ -151,34 +137,7 @@ in
   # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
   system.stateVersion = "25.11"; # Did you read the comment?
 
-  # Home Manager Configuration
-  home-manager.useGlobalPkgs = true;
-  home-manager.useUserPackages = true;
-  home-manager.users.l-wyatt = import ./home.nix;
-  home-manager.sharedModules = [
-    # Kickstart-nvim module
-    ({ config, lib, pkgs, ... }: {
-      options.programs.neovim-kickstart = {
-        enable = lib.mkEnableOption "kickstart.nvim configuration";
-      };
-
-      config = lib.mkIf config.programs.neovim-kickstart.enable {
-        home.file.".config/nvim" = {
-          source = kickstart-nvim;
-          recursive = true;
-        };
-
-        home.packages = with pkgs; [
-          neovim
-          ripgrep
-          fd
-          gcc
-          gnumake
-          git
-        ];
-      };
-    })
-  ];
+  # Home Manager Configuration is handled in flake.nix
 
   ### Start of self configuration
   # Configure grub to provide ubuntu option

flake.lock

@@ -74,6 +74,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-unstable": {
+      "locked": {
+        "lastModified": 1773507054,
+        "narHash": "sha256-Q8U5VXgrcxmCxPtCCJCIZkcAX3FCZwGh1GNVIXxMND0=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "e80236013dc8b77aa49ca90e7a12d86f5d8d64c9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs_2": {
       "locked": {
         "lastModified": 1772822230,
@@ -94,7 +110,8 @@
       "inputs": {
         "home-manager": "home-manager",
         "kickstart-nvim": "kickstart-nvim",
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": "nixpkgs_2",
+        "nixpkgs-unstable": "nixpkgs-unstable"
       }
     },
     "systems": {

flake.nix

@@ -3,6 +3,7 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
+    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixpkgs-unstable";
     home-manager = {
       url = "github:nix-community/home-manager/release-25.11";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -10,17 +11,25 @@
     kickstart-nvim.url = "github:0xWheatyz/kickstart.nvim";
   };
 
-  outputs = { self, nixpkgs, home-manager, kickstart-nvim, ... }: {
+  outputs = { self, nixpkgs, nixpkgs-unstable, home-manager, kickstart-nvim, ... }:
+    let
+      system = "x86_64-linux";
+      pkgs-unstable = import nixpkgs-unstable {
+        inherit system;
+        config.allowUnfree = true;
+      };
+    in {
     nixosConfigurations = {
       nixos = nixpkgs.lib.nixosSystem {
-        system = "x86_64-linux";
+        inherit system;
+        specialArgs = { inherit pkgs-unstable; };
         modules = [
           ./configuration.nix
           home-manager.nixosModules.home-manager
           {
             home-manager.useGlobalPkgs = true;
             home-manager.useUserPackages = true;
-            home-manager.users.l-wyatt = import /home/l-wyatt/.config/home-manager/home.nix;
+            home-manager.users.l-wyatt = import ./home.nix;
             home-manager.extraSpecialArgs = {
               inherit kickstart-nvim;
             };

home.nix

@@ -70,6 +70,16 @@
     initContent = ''
       export SHELL=$(which zsh)
       alias nix-shell='nix-shell --run $SHELL'
+
+      # Auto-update nixpkgs-unstable (for claude-code) on rebuild
+      nixos-rebuild() {
+        if [[ "$1" == "switch" || "$1" == "boot" || "$1" == "test" ]]; then
+          echo "Updating nixpkgs-unstable for latest Claude Code..."
+          nix flake update nixpkgs-unstable --flake /home/l-wyatt/Documents/nixos-configuration
+        fi
+        command sudo nixos-rebuild "$@" --flake /home/l-wyatt/Documents/nixos-configuration
+      }
+
       nix() {
         if [[ $1 == "develop" ]]; then
           shift