Durably render a table read artifact as an MP3 or MP4.

Initiates a durable render of a table_read artifact alongside the live share. mode: "audio" (default, free) queues a durable full-mix MP3 render (voices, adaptive soundtrack, and SFX) regardless of whether a live Pipecat/Daily recording exists. When a completed recording is present, the worker freezes that take as the voice layer; otherwise it synthesizes the voice track headlessly from TTS using the same producer the MP4 export uses. Poll GET /artifacts/{id}: manifest.audio.finalize.status progresses through queued → rendering → uploading → complete (or failed with manifest.audio.finalize.error). On complete, manifest.audio.recordingUrl (full-mix MP3 download URL) and manifest.audio.recordingDurationMs are populated. mode: "video" (free) queues the Remotion MP4 export (same render as POST /artifacts/{id}/render-video). Poll GET /artifacts/{id}: manifest.video.status and manifest.video.url on completion. Replay-safe: re-calling finalize while in-flight, or when complete and the recording still carries the read's current mix, returns the current status without re-charging credits (finalize.mix: "current"). A complete recording that the read has moved past since — its music, sound cues or voice track changed, in the app or through this API — is rendered again (free) under a new media revision; the old manifest.audio.recordingUrl keeps serving until the new render completes. A complete recording made before its mix was tracked replays with finalize.mix: "unknown"; pass refresh: true to render it again from the read as it plays now (the app's "Update the recording"). A recording that is current still replays free with refresh: true. A finalize that would SPEAK a voice its provider has retired is refused before anything is charged or queued (409 voice_retired, details.voices): migrate those voices (POST /voice-migrations), or re-voice the character, then finalize again. A read whose voices-only track is current is mixed from it and speaks nothing, so it is never refused for its voices. A read whose table read is not paid for yet — a Writing Lab read that was cast but never prepared — is refused before anything is charged or queued (409 table_read_not_prepared): prepare it (POST /scripts/{scriptUploadId}/table-read/prepare), then finalize. A read a Story API job made is paid by that job. Requires Idempotency-Key. Scope: artifact:publish (billable + mutating).