pub fn embed_carrier(style: EmbedStyle, format: Format) -> Option<MetaCarrier>Expand description
Resolve an EmbedStyle + metadata format to the carrier a new document
should get. Separate maps to a whole-file sidecar in format; every other
style maps to the concrete EmbedType for that (style, format) pair.
None for a combination that has no archetype — notably Delimited + fig
(the dialect has no ----style delimiter) and any fenced style paired with a
format fig cannot fence (Zon).