docs: Enhanced CLAUDE.md with comprehensive development guidelines (#2)

[serithemage]

Description

Significantly enhances the CLAUDE.md file to provide comprehensive guidance for future Claude Code instances working in this repository.

Key Changes

• Enhanced Development Commands: Added specific test commands for single files, E2E testing with Playwright, watch mode, coverage, and formatting commands
• Detailed Architecture Documentation: Expanded Clean Architecture explanation with complete Entity → Repository → UseCase → Controller → Handler flow
• Naming Conventions & Branching Strategy: Added comprehensive naming rules for files, directories, components, and Git branching strategy with GitHub Issues integration
• Integrated Development Rules: Consolidated rules from Cursor IDE (.cursor/rules/) and Windsurf (global_windsurf_rules.md) configurations
• Technology Stack Information: Added precise version information for all dependencies and tools
• Common Development Workflows: Added practical examples for testing specific components, debugging, and development processes
• Important References: Added references to design documentation and IDE rules integration

Technical Details

• Commands Added: Single file testing, E2E commands, watch mode, coverage testing, specific CDK deployment commands
• Architecture Enhancement: Detailed Clean Architecture layers with directory structure mapping
• Branching Strategy: GitHub Issues integration with format <type>/<issue-number>-<description>
• Commit Standards: Enhanced with issue references and detailed examples
• Version Information: Node.js v22.x, React v19.x, TypeScript v5.7.x/5.8.x, and all major dependencies

Impact

This enhancement will significantly improve the productivity and consistency of future Claude Code instances by providing:

• Clear development standards and best practices
• Comprehensive command reference for all common development tasks
• Consistent naming and branching strategies across the project
• Integration with existing IDE rules and development workflows
• Complete technology stack reference for version management

Testing

• Documentation is consistent with actual project structure
• All referenced commands verified against existing package.json files
• Integration with existing .cursor/rules/ and global_windsurf_rules.md confirmed
• Pre-commit hooks pass successfully
• Branching strategy follows new GitHub Issues integration format

Files Modified

• CLAUDE.md: Comprehensive enhancement (394 insertions, 21 deletions)

Closes #2