Read typed director's commentary in the director's voice and link each piece to its sound (costs credits)

The director's commentary (doc.director): the creator talking over the film, heard on the public /watch page only when the viewer turns it on (a switch, off by default, and a film sound / director balance). It is tracks, each on the path it was made on (path, decision id -> option id; absent: every path): a path that took another option at a decision at or before a piece's start does not hear it, one that takes another after its start cuts it at that decision, so a track on the shared start plays on every path until a decision cuts it. Each piece (segments) starts at a FILM second fromS on that path (the film's clock: a decision's wait does not count) and plays its soundId (a recording made on the page, or typed text read here) at level (0-2); the film's music, ambience and effects dip under it. Each typed piece named in segment_ids, else every one with words and no sound yet, is read by ElevenLabs text-to-speech (eleven_multilingual_v2) in the director's voice (doc.director.voiceId, else the default), brought to -20 LUFS, added to the film's sounds (kind voice) and linked to its piece. Free by hand: {op: "addDirectorSegment", trackId, path?, segment: {id, fromS, text?, soundId?, level?}} (a new trackId makes the track with that path; an existing one keeps its own), updateDirectorSegment {id, patch: {fromS?, text?, soundId?, level?}} (new words unlink a read sound, never a recording; null clears), removeDirectorSegment {id}, setDirectorVoice {voiceId | null}. Recording with a microphone is the page's alone. Costs credits: audio_voice_100char per 100 characters, the voice-over's price (see /v1/pricing). Quote first with dry_run: true: credits, each piece's characters and credits, the voice, and voices, the voice ids on offer. Without dry_run it answers 202 { task_id }: poll GET /v1/tasks/{id}. Each piece is charged once its sound is on the storyboard, through your token so its daily cap applies. Paid tier only (402 audio_requires_purchase on trial credits). A storyboard whose owner approves agent spending answers 403 except for the quote.