ApiJsDoc

Renders a symbol's JSDoc body. Plain prose for now; once marked is exposed on the runtime side via a shared helper, this component will render the description through the same pipeline as .md content (code fences highlighted, inline links resolved, keyword auto-linking applied).

Today: paragraphs split on blank lines, <code> for backtick-wrapped tokens, links for bare URLs and {@link Symbol} tags. Enough for the v1 cut.