bindings: the author a record's own text can offer

book-pipeline had its own copy of bibclean's author recovery. Bound on all
four surfaces so it can stop.

Checked against that Python over all 5,385 books in the library: 5,375
identical. On the other ten the Python had taken a translator, an illustrator
or the publisher off a copyright line — Sally-Ann Spencer for *The Dwarves*,
Thomas Nelson for a table of contents, C. S. Lewis for a book about Tolkien —
and bibclean either finds the real author in the Library of Congress block or
says nothing. Every one of the ten was read by hand.

crates/bindings/src/lib.rs

@@ -215,6 +215,17 @@ pub fn parse_identifier(text: &str) -> Option<idnorm::Identifier> {
     idnorm::parse(text)
 }
 
+/// The best author a record's own title and front matter can offer.
+///
+/// `None` when neither says anything that reads as a person's name, which is
+/// the honest answer for a scanned book with no title page.
+pub fn suggest_author(
+    title: &str,
+    front_matter: Option<&str>,
+) -> Option<bibclean::author::Suggestion> {
+    bibclean::author::best(title, front_matter)
+}
+
 /// Whether a chunk of body text carries footnote or endnote citations.
 ///
 /// The structural signal a converter leaves on EPUB3 note definitions first;
@@ -269,6 +280,17 @@ mod tests {
         assert_eq!(count_tokens("a passage"), textkit::count("a passage"));
     }
 
+    #[test]
+    fn the_author_surface_agrees_with_the_library_underneath() {
+        const TITLE: &str = "Aquinas (Companion)";
+        const FRONT: &str = "THE CAMBRIDGE COMPANION TO AQUINAS\n\nedited by Norman Kretzmann";
+        assert_eq!(
+            suggest_author(TITLE, Some(FRONT)),
+            bibclean::author::best(TITLE, Some(FRONT))
+        );
+        assert!(suggest_author("", None).is_none());
+    }
+
     #[test]
     fn the_footnote_signal_agrees_with_the_library_underneath() {
         const NOTES: &str = "1. John Smith, *A Title* (Oxford: Clarendon Press, 1998), 183.\n\