Module stt

@alexkroman1/aai/stt subpath barrel.

Re-exports the descriptor factories (assemblyAIStt, deepgram, elevenlabs, soniox) and the shared STT contract types. Importing this barrel does not pull in the assemblyai SDK — that happens only when the host resolver is invoked.

Named re-exports rather than export *: the wildcard form needs a noReExportAll suppression per line, and the escape-hatch ratchet only moves down. Listing them also makes the public surface of this subpath readable in one place — add new symbols here when a provider gains one.