paper2reel - aligned artifact viewer

paper2reel builds a browsing layer over existing artifacts. It does not replace or mutate paper2poster, ppt-master, paper2blog, or paper2video outputs.

The key artifact is:

content_alignment.json

It maps the canonical section ids from paper2assets's assets/meta/sections.json to:

• poster DOM targets, usually [data-section="<id>"];
• slide frame targets, usually one or more slide indexes;
• blog blocks rendered from the same paper2blog content used for final DOCX;
• video clips and subtitles derived from the same paper2video timeline used for final MP4 delivery.