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)

Makefile

@@ -0,0 +1,131 @@
+# Everforest Resources - Makefile
+# Alternative build commands for development and CI
+
+.PHONY: all generate validate lint format clean install demo ci help
+
+# Default target
+all: generate validate
+
+# Core development commands
+generate:
+	@echo "🎨 Generating all theme files..."
+	node scripts/generate-themes.mjs
+
+validate:
+	@echo "✅ Validating generated outputs..."
+	node scripts/validate.mjs
+
+lint:
+	@echo "🔍 Checking code quality..."
+	npm run lint
+
+lint-fix:
+	@echo "🔧 Auto-fixing linting issues..."
+	npm run lint:fix
+
+format:
+	@echo "✨ Formatting code..."
+	npm run format
+
+# Installation commands
+install:
+	@echo "📦 Installing themes to system..."
+	./install.sh
+
+install-dry:
+	@echo "🔍 Preview theme installation..."
+	./install.sh --dry-run
+
+install-backup:
+	@echo "💾 Installing themes with backup..."
+	./install.sh --backup
+
+# Development server
+demo:
+	@echo "🌐 Starting web demo server..."
+	@echo "Open http://localhost:3000/docs/examples/web-demo.html"
+	python3 -m http.server 3000
+
+# Testing and validation
+test:
+	@echo "🧪 Running Playwright tests..."
+	npx playwright test
+
+snapshots:
+	@echo "📸 Updating Playwright snapshots..."
+	npx playwright test --update-snapshots
+
+verify:
+	@echo "🔬 Verifying installation in container..."
+	ENGINE=docker ./verify/verify.sh
+
+# CI pipeline
+ci: lint generate validate test
+	@echo "🚀 Full CI pipeline completed successfully"
+
+build: generate validate
+	@echo "🏗️  Build completed successfully"
+
+# Maintenance
+clean:
+	@echo "🧹 Cleaning generated files..."
+	@find . -name "*-dark-*" -type f ! -path "./node_modules/*" -delete
+	@find . -name "*-light-*" -type f ! -path "./node_modules/*" -delete
+	@echo "Generated theme files cleaned"
+
+clean-node:
+	@echo "🧹 Cleaning node_modules..."
+	rm -rf node_modules package-lock.json
+	npm install
+
+stats:
+	@echo "📊 Project Statistics:"
+	@echo "Generated files: $$(find . -name '*-dark-*' -o -name '*-light-*' | grep -v node_modules | wc -l)"
+	@echo "Templates: $$(find . -name 'template.*' | wc -l)"
+	@echo "CLI tools: $$(find cli -maxdepth 1 -type d | grep -v '^cli$$' | wc -l)"
+	@echo "Terminals: $$(find terminals -maxdepth 1 -type d | grep -v '^terminals$$' | wc -l)"
+	@echo "Editors: $$(find editors -maxdepth 1 -type d | grep -v '^editors$$' | wc -l)"
+
+# Development workflow
+dev: generate demo
+	@echo "🚀 Development server started"
+
+release: ci
+	@echo "🎯 Creating release..."
+	npm run release
+
+# Help target
+help:
+	@echo "Everforest Resources - Available Commands:"
+	@echo ""
+	@echo "Development:"
+	@echo "  make generate     - Generate all theme files from templates"
+	@echo "  make validate     - Validate generated outputs"
+	@echo "  make lint         - Check code quality with Biome"
+	@echo "  make lint-fix     - Auto-fix linting issues"
+	@echo "  make format       - Format code with Biome"
+	@echo "  make dev          - Generate themes and start demo server"
+	@echo ""
+	@echo "Installation:"
+	@echo "  make install      - Install themes to ~/.config"
+	@echo "  make install-dry  - Preview installation without changes"
+	@echo "  make install-backup - Install with backup of existing configs"
+	@echo ""
+	@echo "Testing:"
+	@echo "  make test         - Run Playwright visual tests"
+	@echo "  make snapshots    - Update Playwright snapshots"
+	@echo "  make verify       - Verify installation in Docker container"
+	@echo ""
+	@echo "CI/CD:"
+	@echo "  make ci           - Run full CI pipeline"
+	@echo "  make build        - Run build pipeline (generate + validate)"
+	@echo "  make release      - Create release after CI checks"
+	@echo ""
+	@echo "Utilities:"
+	@echo "  make demo         - Start web demo server"
+	@echo "  make clean        - Remove generated theme files"
+	@echo "  make clean-node   - Clean and reinstall node_modules"
+	@echo "  make stats        - Show project statistics"
+	@echo "  make help         - Show this help message"
+	@echo ""
+	@echo "Quick start: make generate && make install"