v21.0: Predictive Backtesting Results

Executive Summary

v21.0 backtested the 8-symbol GOURMET temporal windows against 30 days of historical grounding data (May 29 – June 27, 2026). The results demonstrate that short windows (3-7 days) are strong predictors of cross-domain events, with the 7-day window achieving an F1 score of 0.978.

**Key Finding: The