Add presentation for NotebookLM podcast generation

Structured document covering 7 key features of the reference repo:
- CBA (Codebase Agent)
- Memory System (Modular Context)
- Issue-to-PR Automation
- Layered Architecture Patterns
- Security Patterns
- Testing Patterns
- CI/CD for Documentation

Target audience: Principal engineers evaluating AI-assisted development

Author: jeremyeder