feat: add missing project files and fix architecture compliance

- Add LICENSE file (MIT)
- Add CONTRIBUTING.md with generator-first workflow guidelines
- Add Makefile with comprehensive development commands
- Add .editorconfig for consistent code formatting
- Add CHANGELOG.md for version tracking
- Remove inconsistent non-variant files that bypassed generator architecture
- Fix installation script to use variant-specific paths (prevent config overwriting)

CHANGELOG.md

@@ -0,0 +1,61 @@
+# 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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Comprehensive theme generator system with template-based approach
+- Support for 26 CLI tools with complete 6-variant coverage
+- Support for 5 terminal emulators (WezTerm, Alacritty, Kitty, Windows Terminal, Ghostty)
+- Support for 5 code editors (Neovim, VS Code, JetBrains IDEs, Zed, Sublime Text)
+- Web CSS themes with Playwright visual testing
+- Universal installer script with variant-specific paths
+- Complete CI/CD pipeline with automated testing
+- Docker-based verification system
+- Generator-first architecture preventing manual edits
+- ANSI-based CLI tool theming for terminal compatibility
+- Comprehensive documentation and contribution guidelines
+
+### CLI Tools Supported
+- Shell: Fish, Zsh, Starship prompt
+- File Management: LS_COLORS, eza, fd, ranger, lf, mc
+- Git Tools: delta, lazygit, gitui, tig
+- Search: fzf, ripgrep, jq
+- System Monitoring: htop, btop, bottom, glances, neofetch
+- Terminal: tmux, less, atuin, zoxide
+- Development: bat
+
+### Fixed
+- Installation script now uses variant-specific file names to prevent overwriting user configurations
+- Removed inconsistent non-variant files that bypassed the generator architecture
+- Added proper theme directory structure for safe installation
+
+### Infrastructure
+- Biome linting and formatting
+- Husky pre-commit hooks
+- Conventional Commits enforcement
+- Playwright visual testing
+- Container-based verification
+- Comprehensive Makefile for development workflows
+
+## [0.1.0] - 2024-09-06
+
+### Added
+- Initial project scaffold and architecture
+- Canonical Everforest palette definitions in JSON and YAML formats
+- Template system with color placeholder support
+- Complete theme generation for all 6 variants (dark/light × hard/medium/soft)
+- Universal installation script
+- Basic documentation and project structure
+
+---
+
+## Contributing
+
+Please read [CONTRIBUTING.md](CONTRIBUTING.md) for details on our code of conduct and the process for submitting pull requests.
+
+All changes should be documented in this changelog following the [Keep a Changelog](https://keepachangelog.com/) format.