Add CLAUDE.md and improve clangd configuration

- Add CLAUDE.md with nvim configuration guidance for future Claude instances
- Rename clangd.lua to clangd_helper.lua for better organization
- Document modular structure, LSP setup, and common commands
- Include information about kickstart.nvim fork and conflict-minimizing design

🤖 Generated with Claude Code (claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Neovim Configuration Structure
+
+This is a Neovim configuration forked from https://github.com/nvim-lua/kickstart.nvim and structured to minimize merge conflicts when updating from upstream. All custom modifications are isolated in the `lua/custom/` directory, allowing the main `init.lua` and kickstart files to be updated with minimal conflicts.
+
+The configuration is organized in a modular structure:
+
+- **`init.lua`**: Main configuration file that loads all settings, keymaps, and plugins
+- **`lua/custom/`**: Custom configuration modules
+  - **`options.lua`**: Custom vim options (indentation, Nerd Font settings)
+  - **`keymaps.lua`**: Custom key mappings
+  - **`plugins/`**: Plugin configurations
+    - **`init.lua`**: Plugin imports and basic plugin setup
+    - **`lsp/`**: LSP-specific configurations
+      - **`lsp.lua`**: LSP server configurations (Python, Nix, Rust, Go, C/C++)
+      - **`clangd_helper.lua`**: Advanced clangd setup with compile_commands.json detection and file watching
+
+## LSP Configuration
+
+The LSP setup includes:
+- **clangd**: C/C++ with automatic compile_commands.json detection and file watching
+- **pyright**: Python language server with basic type checking
+- **nixd**: Nix language server  
+- **ruff**: Python linter
+- **texlab**: LaTeX support
+- **cmake**: CMake language server
+
+The clangd configuration in `lua/custom/plugins/lsp/clangd_helper.lua` automatically:
+- Searches for compile_commands.json files using `fd`
+- Watches for changes and restarts clangd when compile_commands.json is updated
+- Provides a `:ReloadClangd` command for manual restart
+
+## Key Features
+
+- Uses **lazy.nvim** for plugin management
+- **Blink.cmp** for autocompletion with LSP integration
+- **Telescope** for fuzzy finding
+- **Treesitter** for syntax highlighting
+- **Which-key** for keymap help
+- **Mini.nvim** modules for text objects, surround, and statusline
+- **TokyoNight** colorscheme
+
+## Common Commands
+
+- `:Lazy` - Manage plugins (install, update, etc.)
+- `:checkhealth` - Check Neovim configuration health
+- `:ReloadClangd` - Manually restart clangd LSP server
+- `<space>sh` - Search help documentation
+- `<space>sf` - Find files
+- `<space>sg` - Live grep search
+- `<space>f` - Format current buffer
+
+## Development Workflow
+
+1. Configuration changes are made in `lua/custom/` files
+2. Plugin configurations go in `lua/custom/plugins/`
+3. LSP servers are expected to be installed system-wide (via Nix/Home Manager based on comments)
+4. The configuration uses lazy loading for most plugins to optimize startup time