fn nearest_citation_key(
unknown: &str,
records: &BTreeMap<String, BibEntry>,
) -> Option<String>Expand description
The single loaded citation key that is a conservative near-miss for
unknown, if any. Candidate filtering stays here (is_citation_key);
the selection rule (length floor, len / 3 bound, ties suggest nothing)
lives in crate::suggest::nearest_match.