AAI SDK
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    Type Alias AssemblyAITtsVoice

    AssemblyAITtsVoice:
        | keyof typeof ASSEMBLYAI_TTS_VOICES
        | string & Record<never, never>

    A voice id from ASSEMBLYAI_TTS_VOICES.

    The (string & {}) arm is deliberate: the catalog is the service's, not ours, so a voice added after this release must still compile, and so must a deprecated one an existing agent already names. It keeps the current names visible at the call site without turning a stale SDK into a build failure.