Renders LaTeX via spec data-mx-maths spans/divs (KaTeX render of the attr,
children as fallback) and conservative $…$ / $$…$$ text detection (escape-aware,
currency-guarded, never inside code/pre). KaTeX + CSS load lazily on first math
(ReactPrism pattern) — verified absent from the eager bundle. Sanitizer
unchanged by design (we render post-sanitize from attr/text; no incoming MathML
accepted). +14 unit tests.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
