Last version with both Python and Epsilon generators

This release marks the completion of the dual-generator architecture.
Both Python and Epsilon generators are fully functional and production-ready.

Key Features:
- 13 FHIR implementation patterns documented
- 40+ diagrams (PlantUML class, sequence, component)
- 150+ code examples
- Complete MkDocs site generation
- Complete EPUB generation
- 100% test pass rate (6/6 tests)

Epsilon Generator Fixes (7 issues):
1. Getting Started links - Fixed EGL delimiter confusion
2. Forces Analysis - Added pattern intent display
3. Key Interactions - Fixed keyInteractions field mapping
4. Shared Services - Added usedBy, purpose, standards fields
5. Technology Options - Fixed string vs collection handling
6. Pattern Organization - Verified working
7. Diagram links - Verified working

Python Generator:
- EPUB builder updated to use direct model attributes
- Templates improved for consistency
- YAML to Ecore transformation enhanced

Both generators produce equivalent, high-quality output.

Future versions will use Epsilon exclusively.
This is the last commit with Python generator code.

Documentation: See RELEASE_SUMMARY.md and EPSILON_ALL_ISSUES_FINAL.md
Test Results: GENERATOR_TEST_RESULTS.md