Trim to the 27 validated original NatureBench tasks

fix(cryo-ET): replace data.tar.gz with de-leaked archive (removed leaked validation coords/occu_map)

fix(single-cell): add missing onek1k genome_human.fa.fai (identical to neurips; avoids pysam RO-write crash)

fix(ECD): de-leak — remove 983 test-molecule spectra CSVs + rebuilt train/val metadata & indices

fix: apply doc/metadata/evaluator corrections (7 tasks) + drop stale score.json

discard task s41587-025-02654-4 (unfixable/broken; removed from benchmark)

discard task s41592-024-02580-4 (unfixable/broken; removed from benchmark)

discard task s41592-025-02893-y (unfixable/broken; removed from benchmark)

Duplicate from FrontisAI/NatureBench