Application catalog profiles, selected independently of the wire protocol.

MOQX.subscribe/3 selects a profile per subscription; omission or :none delivers opaque objects, including on catalog-named tracks. Explicit CMSF profiles work over all three built-in protocols. :hang requires Lite05. Unsupported compositions fail before opening a stream.

Profile state belongs to the existing connection driver and to individual handles. A malformed catalog emits MOQX.Event.CatalogFailed for that subscription; other subscriptions and the connection continue.