Add authoritative public API catalog

tests/compat/src/lib.rs

@@ -1,6 +1,10 @@
 //! Shared failure marker used by generated compatibility tests.
 
 /// Fails a not-yet-translated upstream test while retaining parity metadata.
+///
+/// # Panics
+///
+/// Always, with the retained upstream test identity.
 #[track_caller]
 pub fn pending(source: &str, line: u64, test: &str, attribute: &str, body_sha256: &str) -> ! {
     panic!(