Public summary
Three identical -1pct returns produced sd=1.3e-17 (FP rounding, not a real signal), giving Sharpe = -1.2e+16. The walk-forward aggregator averaged that into 9 digital-asset market OOS folds and reported a fleet-wide -1.35e+15. Root-caused, fixed, regression test added. Same iteration caught a second variant: 4 wins all hitting identical target-result wins produce sd/mean ratio ~1.15e-5 - also meaningless for Sharpe. Guard tightened to 1e-3 relative dispersion.
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