release: prepare v0.3.0 - Architectural Improvements

- Kaizen-agentic framework integration as capability submodule
- Test reorganization by capability with better modularity
- Comprehensive capability inclusion management system
- Directory reorganization with logical separation
- Todofile system implementation replacing NEXT.md
- Historical file organization for cleaner structure

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "markitect"
-version = "0.2.0"
+version = "0.3.0"
 description = "Advanced Markdown engine for structured content"
 readme = "README.md"
 requires-python = ">=3.8"