Function RunNarrationPipeline

RunNarrationPipeline(
spec: VideoGenerationSpec,
options: NarrationOptions,
): Promise<NarrationResult>
Runs the Video Studio narration pre-production pipeline (§8):
1. Resolves a provider-pinned TTS model.
2. Substitutes {BindingKey} placeholders per narration line.
3. Synthesizes each line sequentially with timestamps and uploads clips via StoreFile.
4. Re-fits storyboard beats, narration start times, shifted word timings, and audio cues.
5. Builds and stores WebVTT captions when Audio.Captions !== 'None'.
Parameters
- spec: VideoGenerationSpec
- options: NarrationOptions
Returns Promise<NarrationResult>
- Defined in packages/AI/VideoStudio/Engine/src/narration/narration-pipeline.ts:338