Turn one finished text — deep-research report.md, study notes.md, any .md/.txt file,
or pasted content — into a single self-contained HTML page: editorial typography plus
inline SVG figures built only from data already present in the text. No new research,
no invented numbers, no external dependency; the page opens offline from file://.
Use when the user says "layout", "mise en page", "HTML version", "rends ça lisible",
"turn this into a page", or runs /layout-html.
