MorphPT training split (human subset of CellImageNet)

Label spaces and the split specification for the released MorphPT model.

coarse_to_id.json — 6 broad morphology-informed groups → id (router classes)
fine_to_coarse.json — 21 fine cell types → broad group
fine_class_to_idx.json — fine cell type → id
expert_groups.json — which groups have experts vs. are passthrough
split_manifest_seed1337.json — split parameters (seed, per-class subsample targets, per-slide caps, class lists) used to build the train/val/test split from CellImageNet. Reproduce the cell-level split by running the data-prep pipeline against CellImageNet with these parameters (seed 1337).