metadata: add 59-class baseline taxonomy crosswalk mapped to Tongren-95

metadata: add unified multi-cohort clinical abbreviations crosswalk (135+ terms)

metadata: add 66-class fine-grained ophthalmic taxonomy codebook and disambiguation guide

Add 83w fundus cleaning report audit metadata (JSON)

Add 83w fundus cleaning report audit metadata (CSV)

Add 4.3M unified master manifest index (Parquet)

Add input inventory

Add labeled assets summary

Add Tongren 95-class taxonomy crosswalk

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