Transform theme system from large inline dictionaries to maintainable YAML files:
**Architecture:**
- File-based themes organized by scope: mode/, ui/, document/, branding/
- Dynamic theme loading with automatic discovery
- Hybrid system maintaining 100% backward compatibility
- Rich metadata support with theme documentation
**Implementation:**
- Created markitect/themes/ directory with organized structure
- Added ThemeRegistry for dynamic YAML theme loading
- Extracted ChatGPT and Substack themes to separate files
- Added mode themes (light.yaml, dark.yaml) as examples
- Integrated with existing LAYERED_THEMES system seamlessly
**Benefits:**
- Improved maintainability: each theme is a separate file
- Better collaboration: multiple contributors can work simultaneously
- Enhanced discoverability: clear organization shows available themes
- Rich documentation: each theme file includes design notes and metadata
- Schema validation potential with YAML format
**Quality Assurance:**
- Comprehensive 12-test suite for modular system (12/12 passing)
- Backward compatibility verified with existing 15 theme tests (15/15 passing)
- CLI integration tested and working with file-based themes
- Theme combination and scoping functionality preserved
**Files Created:**
- markitect/themes/__init__.py - Theme registry and dynamic loader
- markitect/themes/README.md - Complete documentation and usage guide
- markitect/themes/document/{chatgpt,substack}.yaml - Modular theme files
- markitect/themes/mode/{light,dark}.yaml - Mode theme examples
- tests/test_modular_theme_system.py - Comprehensive test coverage
Addresses maintainability concerns while preserving all existing functionality.
No breaking changes - all existing code, CLI commands, and API calls work unchanged.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
tegwick
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