feat: add z-score data type#85
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New ZSCORE_TYPE (3) with aliases: zscore, z, standardized - Per-feature mean/std computed on training data in Data.feature_means/feature_stds - Stats computed automatically when data_type contains 'zscore' - Propagated from train to test in lib.rs (avoids data leakage) - Supports all languages (binary, ternary, ratio, pow2, MCMC) - evaluate_zscore applies (x - mean) / std per feature on the fly Tested on wetlab_protocol: Test AUC=1.000 with k=5 (Beam) 780 lib tests pass (4 new zscore tests)
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New ZSCORE_TYPE (data_type: zscore) with per-feature mean/std standardization. Stats computed on training data, propagated to test. All languages supported. 4 new tests, 780 total pass.