- Introduced `markdown.processor` config to swap the default Unified Markdown processor, with a new Rust‑based Sätteri processor option.
- Deprecated top‑level `markdown.remarkPlugins`, `markdown.rehypePlugins`, and related MDX integration options; they will be removed in a future major release.
- Added support for Sätteri to parse `.mdx` files (recmaPlugins unsupported) and updated dependencies.