Qualify read-only forwarding and scoped portable discovery

test/fixtures/local-first-composite/workspace.qx

@@ -7,6 +7,7 @@ workspace Reader id "workspace:reader" revision "workspace:reader@1" commit "aaa
   import package ReaderRuntime;
   import package CommentRuntime;
   import interface DocumentMetadata;
+  import interface DocumentLabel;
   import interface CommentFactory;
   // Shared record definitions, repeated explicitly in independently locked resources.
 
@@ -62,6 +63,10 @@ workspace Reader id "workspace:reader" revision "workspace:reader@1" commit "aaa
     };
   }
 
+  conform Document as DocumentLabel id "conformance:reader:document-label" {
+    bind title.get to interface DocumentMetadata.label.get;
+  }
+
   conform Document as DocumentMetadata id "conformance:reader:document-metadata" {
     private state Label id "slot:document:label" on Document : string policy register;
     initialize { label to state Label; };