Crosswalk user API + one-call keyed classification: resy_classify(by=) resolves name/GBIF/WFO/POWO/Euro+Med-keyed plot data through the crosswalk in one call (resolved -> canonical, unresolved passes through as unknown, taxon_resolution summary); plus resy_canonical_species/add_taxonomy_keys/summarize_taxa/crosswalk_coverage. --as-cran clean.