docs: add project documentation

Add CLAUDE.md with development guidelines and CHANGELOG.md for tracking changes

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Initial monorepo setup with pnpm workspaces
+- `@puaros/core` package with TypeScript and Vitest configuration
+- ESLint strict TypeScript rules with 4-space indentation
+- Prettier code formatting (4 spaces, single quotes)
+- LINTING.md documentation for code style guidelines
+- CLAUDE.md for AI assistant guidance
+- EditorConfig for consistent IDE settings
+- Node.js version specification (.nvmrc: 22.18.0)
+- Vitest testing framework with 80% coverage thresholds
+- Core dependencies: simple-git, tree-sitter (JavaScript/TypeScript), uuid
+
+### Configuration
+- TypeScript: nodenext modules, ES2023 target, strict null checks
+- ESLint: Strict type checking, complexity limits, code quality rules
+- Prettier: 100 char line length, single quotes, trailing commas
+- Test coverage: 80% threshold for lines, functions, branches, statements
+
+## [0.0.1] - 2025-01-23
+
+### Added
+- Initial project structure
+- Monorepo workspace configuration