Compact, ML-split-ready slice of the 01-emit-dataset
pipeline: 5 EMIT scenes already processed to ortho rgb/enh/mask_bin arrays,
plus 512×512 plume/no-plume crops with masks.
The canary is the inputs side for figure regeneration and downstream-pipeline
testing without NASA Earthdata credentials. The full corpus (raw L1B/L2B,
multi-scene catalog, train manifest) lives elsewhere.
