fix(m9/T32b): resolve $ref in InboundAPI runtime validators (no deploy-passes/runtime-400); diamond test; ref-annotation message

src/ZB.MOM.WW.ScadaBridge.TemplateEngine/Validation/ValidationService.cs

@@ -186,10 +186,15 @@ public class ValidationService
                 return;
             }
 
-            foreach (var missing in parsed.UnresolvedRefs)
+            foreach (var missing in parsed.UnresolvedReferences)
             {
+                // Keep the lib:-qualified pointer name SEPARATE from the diagnostic
+                // reason so the message reads "schema 'lib:Foo' could not be resolved
+                // (cyclic reference)" rather than embedding the annotation inside the
+                // lib:-looking string (M9-T32b code-review MINOR).
+                var reasonSuffix = missing.Reason is null ? string.Empty : $" ({missing.Reason})";
                 errors.Add(ValidationEntry.Error(ValidationCategory.SchemaReference,
-                    $"Script '{scriptName}' {schemaLabel} references schema 'lib:{missing}' which could not be resolved.",
+                    $"Script '{scriptName}' {schemaLabel} references schema 'lib:{missing.Name}' which could not be resolved{reasonSuffix}.",
                     scriptName));
             }
         }