docs: Update inline docs and make home-manager module exports

sw/nvim.nix

@@ -1,3 +1,10 @@
+# ============================================================================
+# Neovim Home Manager Configuration
+# ============================================================================
+# Provides conditional Neovim configuration based on user preferences.
+# - If useNvimPlugins=true: Full LazyVim distribution with plugins
+# - If useNvimPlugins=false: Plain Neovim without plugins
+
 { user }:
 {
   pkgs,
@@ -6,23 +13,19 @@
   ...
 }:
 let
+  # Choose Neovim package based on user preference
   nvimPackages =
     if user.useNvimPlugins then
-      [
-        inputs.lazyvim-nixvim.packages.${pkgs.stdenv.hostPlatform.system}.nvim
-      ]
+      [ inputs.lazyvim-nixvim.packages.${pkgs.stdenv.hostPlatform.system}.nvim ]
     else
       [ pkgs.neovim ];
 in
 {
-  # ============================================================================
-  # Neovim Configuration
-  # ============================================================================
-  # This module configures Neovim, specifically setting up TreeSitter parsers
-  # to ensure syntax highlighting works correctly.
 
   home.packages = nvimPackages;
 
+  # Configure TreeSitter parsers for syntax highlighting
+  # Only needed when using plugins (LazyVim includes TreeSitter)
   # https://github.com/nvim-treesitter/nvim-treesitter#i-get-query-error-invalid-node-type-at-position
   xdg.configFile."nvim/parser".source = lib.mkIf user.useNvimPlugins (
     let