Read one capability profile by any of its names

ref is the cap_ internal ID, the @owner/slug handle (URL-encoded or raw), or the routing ID an agent declares. Source profiles include pricing (current offer and USD equivalent at the published top-up rate), trustVocabulary and structured useWith.integration. apiSurface documents public exports and validation for an exact digest when available; null means no published summary, not an empty API. deliveryType is canonical; deliveryMode is retained as a compatibility alias. Source developer.resultContract describes acquired bytes, not hosted invocation. Existing schemas, examples and identifiers remain under developer. Provider identities appear only for accounts that have claimed a public handle.