Replace the react-markdown/Prism component tree with an HTML-string
pipeline (marked -> KaTeX -> Shiki -> DOMPurify -> DOM decorators) patched
into the DOM via morphdom, with per-block reconciliation and a paced
streaming reveal. Cuts streaming CPU versus the previous renderer while
preserving file-reference links, mermaid diagrams, table export, and
agent/skill/favicon link handling. Public MarkdownRenderer/
SimpleMarkdownRenderer props are unchanged (drop-in).
Bohdan Triapitsyn
4d506fba4e