Here are the classes, structs, unions and interfaces with brief descriptions:

[detail level 12]

Narachnespace
Cariadne
Cpenelope
Cpheidippides	Batch courier for Wikidata/Commons: collects IDs, issues HTTP requests, and returns a merged JSON payload
Carachne	Accumulates entity IDs into per-kind batches and organizes groups
Ncorespace
Chttp_client	Minimal, synchronous HTTP GET client built on libcurl
Coptions	Configuration for fetching entities via MediaWiki/Wikibase API
Cnetwork_metrics	Thread-safe counters describing client-side networking activity
Chttp_response	Result object for an HTTP transfer
Cnetwork_options	Fixed runtime options for the HTTP client