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feat: add regression fit functions (Spearman, RMSE, MI) - #59
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New FitFunction variants: - spearman: Spearman rank correlation (regression mode) - rmse: negated RMSE (higher = better, for consistency) - mutual_information: histogram-based MI between predictions and targets Implementation: - Spearman with average-rank tie handling - Neg-RMSE for optimization (higher = better) - MI with 10-bin discretization - Regression fitness path in population.rs skips classification metrics - Bias penalty skipped for regression fit functions Tests: 8 new tests (perfect correlation, negative, ties, RMSE zero/nonzero, MI) Closes #15
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Summary
Add three regression fitness functions: Spearman rank correlation, RMSE, and Mutual Information.
This validates the ClassificationMetrics refactor (#45) — regression models use
fitbut leaveclsfields at their defaults.New fit functions
spearmanrmsemutual_informationUsage
Test plan
Closes #15