- Created new ELO module (src/elo/) with:
- Simple rating-only system (no RD or volatility tracking)
- Standard ELO expected score calculation
- Per-point performance scoring
- Effective opponent formula for doubles
- Full test suite (21 tests, all passing)
- Updated main.rs to use ELO calculator:
- Per-point scoring: performance = points_scored / total_points
- Effective opponent in doubles: Opp1 + Opp2 - Teammate
- K-factor = 32 for casual play
- Created analysis tool (src/bin/elo_analysis.rs):
- Reads match history from database
- Recalculates all ratings using pure ELO
- Generates before/after comparison (JSON + Markdown)
- Updated documentation:
- New LaTeX report (rating-system-v3-elo.tex)
- Simplified explanations (no volatility/RD complexity)
- Plain English examples and use cases
- FAQ section
- All tests passing (21/21 ELO tests)
- Code compiles without errors
- Release build successful
