feat: publish layers.pub records in Stage 6 of publish pipeline
Wire transcriptToLayersPub and nlpToAnnotationLayers into the publish
pipeline as Stage 6. For each talk with both transcript and NLP data,
produces 6 records (expression, segmentation, 4 annotation layers)
published in parallel via Promise.all. Also adds 3 new lens files to
Stage 0 and exports layers-pub from @ionosphere/format.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>