/**
 * Save a voice turn's audio to R2 so it can be replayed (double-tap the message).
 *
 * Fire-and-forget by contract: a failure means that turn has no replay, never a broken
 * send. The message itself has already gone out by the time this runs — see `emitSend`,
 * which mints the turn id, sends the text, and only then kicks this off.
 *
 * Lifted out of `use-voice.ts` because it depends on nothing in the hook: three primitives
 * in, no refs, no React. Its retry/skip rules are the only real branching in it, and they
 * were untested while it lived inline — `voice-audio.test.ts` covers them now.
 */
export declare function uploadVoiceAudio(instanceId: string, turnId: string, blob: Blob): Promise<void>;
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