feat(ensemble): bagging accuracy + CV scoring#29
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Ports the ensemble sub-package: bagging_classifier_accuracy (exact binomial), fit_bagging + bagging_evaluate_schemes (uniform/c_i/variance weighting), calculate_bootstrap_accuracy; plus Validation.cross_val_score (per-fold RF score over any cross-validator). Behavioural on the DecisionTree.jl backend; exact theoretical accuracy verified. No new deps.