fn stored_extension(kind: FileKind, name: &str) -> StringExpand description
The extension a new original is stored under. It follows the content
where the content decides it (image formats, PDF, SVG, RTF), and
otherwise the user’s extension if it fits the kind (docx vs odt vs doc,
mp3 vs wav, …). Text and unknown files are bin: the same bytes can
arrive as notes.txt and script.py, and agents get a correctly named
link per delivery instead (named_link).