feat(import): resolve references and schema composition

crates/crank-import/tests/unit.rs

@@ -122,7 +122,7 @@ paths:
     }
 
     #[test]
-    fn keeps_references_typed_without_resolving_them() {
+    fn resolves_local_references_into_typed_graph() {
         let ir = normalize_document(SWAGGER2, &NormalizationConfig::default()).unwrap();
         let operation = &ir.operations[0];
         assert!(matches!(
@@ -130,13 +130,15 @@ paths:
                 .response_schema
                 .as_ref()
                 .map(|schema| &schema.kind),
-            Some(crank_import::rest::NormalizedSchemaKind::Reference { .. })
+            Some(crank_import::rest::NormalizedSchemaKind::Object { .. })
         ));
+        assert!(ir.unresolved_references.is_empty());
+        assert!(!ir.reference_graph.edges.is_empty());
         assert!(
             operation
                 .findings
                 .iter()
-                .any(|finding| finding.code == "unresolved_reference")
+                .all(|finding| finding.code != "unresolved_reference")
         );
     }