Stacks the taxonomic backbones (from list_backbones()) and the trait/status
enrichments (from list_enrichments()) into a single frame with a type
column, so a new user can see the full breadth in one call rather than needing
to know three separate discovery verbs. The cross-source trait vocabulary is
summarised in the message footer; browse it with list_traits().
Value
A data.frame with columns: type ("backbone" or "enrichment"),
name, scope (taxonomic scope for backbones; provided trait columns for
enrichments), n_rows, version, installed, source.