feat: add kaizen-agentic as submodule capability

- Add kaizen-agentic submodule from coulomb/kaizen-agentic repository
- Integrate as capabilities/kaizen-agentic/ following capability inclusion pattern
- Update CAPABILITY_REGISTRY.md with new AI agent framework capability
- Update CAPABILITY_INCLUSION_GUIDE.md directory structure
- Update capability metrics: 5 total capabilities, 3 submodules
- Establish kaizen-agentic integration pattern: cd capabilities/kaizen-agentic && make [command]

Extends capability inclusion architecture with:
- Advanced AI agent framework for autonomous development workflows
- Agent definitions, workflow automation, development patterns
- Clear separation from internal MarkiTect functionality

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

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

CAPABILITY_INCLUSION_GUIDE.md

@@ -144,10 +144,11 @@ markitect/                    # Core repository
 └── [... 68+ more capabilities]
 ```
 
-### External Capabilities (4 documented in CAPABILITY_REGISTRY.md)
+### External Capabilities (5 documented in CAPABILITY_REGISTRY.md)
 ```
 capabilities/
 ├── issue-facade/            # Submodule: Universal issue tracking
+├── kaizen-agentic/          # Submodule: AI agent framework
 ├── markitect-content/       # Local: Content processing
 └── markitect-utils/         # Local: Utility functions
 wiki/                        # Submodule: Documentation