- MDX processing is now delegated to the configured Markdown processor; ensure @astrojs/markdown satteri ≥0.4.0 or remark ≥7.3.0 if you have one installed.
- Fixed .mdx handling when extendMarkdownConfig is false – now uses a clean default processor; you can explicitly set a processor via mdx({processor}).
- Added warnings for ignored deprecated remark/rehype plugins when the Markdown processor does not run them.