Retrieve a single voice by its UUID. Use this to resolve a bare voice_id — one the user picked in a voice picker, or a saved preference — back to its attributes without re-listing the whole catalog: gender (0=Male, 1=Female, 3=Neutral), voice_name, is_premium, description, and supports_instructions (whether the voice honors the instructions hint on generateAudio).

The response is a single voice object — the same shape as one entry of listVoices's voices[]. Resolution is workspace-scoped: a voice owned by another workspace (and not globally published) returns 404.