docs: add overview section to CLAUDE.md

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.
+
+## Overview
+This is a Neovim configuration based on AstroNvim v4+ framework. The configuration follows a modular plugin architecture using lazy.nvim as the plugin manager.
+
+## Commands
+
+### Neovim Development
+- **Install/Update plugins**: Launch Neovim and run `:Lazy` to manage plugins
+- **Sync plugins**: `:Lazy sync` to update all plugins
+- **Check plugin health**: `:checkhealth` to verify Neovim setup
+
+### Code Quality Tools
+- **Lua linting**: Uses Selene for Lua linting (configured in `selene.toml`)
+- **Lua formatting**: Uses Stylua with 120-character line width, 2-space indents (configured in `.stylua.toml`)
+
+## Architecture
+
+### Core Structure
+The configuration bootstraps lazy.nvim and loads plugins in a specific order:
+1. `init.lua` - Entry point that bootstraps lazy.nvim and sets leaders
+2. `lua/lazy_setup.lua` - Configures lazy.nvim with AstroNvim and imports
+3. `lua/community.lua` - Imports AstroCommunity plugin packs for language support
+4. `lua/plugins/` - Custom plugin configurations
+5. `lua/polish.lua` - Final configuration applied after all plugins load
+
+### Plugin Organization
+- **Base Framework**: AstroNvim v4 provides the core configuration framework
+- **Language Packs**: Imported from AstroCommunity for Go, TypeScript, Markdown, HTML/CSS, etc.
+- **Custom Plugins**: Located in `lua/plugins/` directory, each file configures specific functionality:
+  - `astrocore.lua` - Core settings, keymappings, and autocmds
+  - `astroui.lua` - UI configuration
+  - `bufferline.lua` - Buffer/tab management
+  - `neotree.lua` - File explorer configuration with extensive ignore patterns
+  - `mason.lua` - LSP server management
+  - `obsidian.lua` - Note-taking integration
+
+### Key Configuration Patterns
+- The configuration uses environment variables (e.g., `LAZY` for custom lazy.nvim path)
+- Defensive programming with pcall() for robust loading across environments
+- Shared ignore patterns between neotree and other file explorers to maintain consistency
+- Leaders: Space as main leader, comma as local leader