noether.core.schemas.dataset

Dataset-related shared types and back-compat re-exports.

The dataset, wrapper, and pipeline config classes have moved next to the classes they configure under noether.data. They are re-exported here lazily to keep the old from noether.core.schemas.dataset import X paths working without eagerly triggering the heavy noether.data imports.

The model-data specification types (FieldDimSpec, DomainDataSpec, ModelDataSpecs) remain here because they have no single implementation home and are consumed across model configs.