API: preprocessing.scaling

skyulf.preprocessing.scaling

Scaling nodes package.

Split from a single 496-LOC module into per-scaler files

_common.py — shared subset-selection helpers standard.py — StandardScaler minmax.py — MinMaxScaler robust.py — RobustScaler maxabs.py — MaxAbsScaler

All public names are re-exported here so existing imports such as from skyulf.preprocessing.scaling import StandardScalerCalculator continue to work unchanged.