Use the standard lcov tools instead of custom HTML generation.
Changes:
- Completely rewrite generate_coverage_html.sh to use lcov
- Install lcov if not available
- Use lcov to capture coverage data from .gcda files
- Use genhtml to create HTML reports with branch coverage
- Add scripts/README.md with usage instructions
Benefits:
- Professional HTML reports with standard lcov styling
- Better branch coverage visualization
- Sortable tables by line/function/branch coverage
- Source code view with execution counts
- Much simpler script (30 lines vs 200+ lines)
The reports now show:
- 32.1% branch coverage (781/2431 branches)
- 43.5% line coverage
- 61.3% function coverage
