Add comprehensive examples and enhancement plan

- basic_example.py: Complete walkthrough of all 4 layers
- visualization_example.py: ASCII visualizations
- REPOSITORY_ENHANCEMENT_PLAN.md: Assessment and roadmap

Addresses user request for examples and assessment of remaining work.

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

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

Author: BruinGrowly