WinRacing V51.3 Consensus Re-Ranking

- Added consensus_agreement_score across V50 confidence, consensus and stability.
- Added consensus_signal_strength.
- Added consensus_support_bonus.
- Added consensus_conflict_penalty.
- Added calibration_rank and final Supreme re-ranking.
- Added consensus_rank_delta and consensus_rank_direction (UP/DOWN/SAME).
- Added consensus_re_rank_score / final_supreme_score.
- Dashboard now shows calibration-to-final rank movement and consensus governance metrics.
- API engine version updated to 51.3.0.
- V44-V50 formulas and source tables remain unchanged.
- No database schema change and no CREATE/ALTER/DROP.