Use when converting long-form markdown (specs, RFCs, reports, plans, explainers) into a readable, well-structured single-file HTML document with sticky TOC, search, and code-copy. Triggers on "convert this spec to HTML", "markdown to doc", "make this RFC readable", "publish this as a document", or "md to HTML". For slide decks, use `slides-deck`. Input must be ≥ 100 lines to warrant HTML rendering.
