lecture-expander

Combine lecture slides (PDF) with a lecturer's audio/video or transcript into a double-width PDF where the left half preserves the original slide (vectors intact) and the right half shows the AI-generated companion notes. Pipeline: audio ASR -> per-slide text extraction -> LLM matching + summarisation -> double-width PDF render (htmlbox + CJK mix + LaTeX + font subsetting). Trigger this skill when the user has PPT/PDF slides plus a recording or transcript and asks to "merge", "expand", "add lecture notes", or "generate an annotated version" of the deck.