Expert assistance for working with the Nix ecosystem, including NixOS, Home Manager, and Nix Flakes. Provides package/option search capabilities, flake templates, debugging guides, and comprehensive documentation for Nix language and Nixpkgs. Use this skill when: (1) Searching for NixOS packages or options, (2) Creating or configuring Nix flakes, (3) Setting up development environments with Nix, (4) Writing Nix expressions or debugging Nix code, (5) Working with NixOS configurations, Home Manager, or any Nix-related tasks.