chore: add Claude Code settings to gitignore and update guidelines

- Add .claude/ directory and CLAUDE.md to .gitignore
- Add development guideline to always update CHANGELOG.md
- Update CHANGELOG.md with unreleased changes

.gitignore

@@ -29,6 +29,9 @@ node_modules
 lib
 test-dist
 
+# Claude Code
+.claude/
+CLAUDE.md
 # WebStorm
 .idea/
 plan/

CHANGELOG.md

@@ -5,6 +5,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Changed
+- Add Claude Code settings (.claude/, CLAUDE.md) to .gitignore
+- Add development guideline to always update CHANGELOG.md
+
+---
+
 ## [0.7.0] - 2025-10-19
 
 ### 🎉 Major Release - MCP Best Practices & Quality Improvements

CLAUDE.md

@@ -2,6 +2,10 @@
 
 This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
 
+## Development Guidelines
+
+- **Always update CHANGELOG.md** when making changes to the codebase
+
 ## Development Commands
 
 ### Build and Prepare