Fix compatibility issues after upstream merge

- Add composite: true to emitter-framework tsconfig for project references
- Add type narrowing in visibility test to fix TypeScript error

Author: FionaBronwen

packages/emitter-framework/tsconfig.json

@@ -7,6 +7,7 @@
     "strict": true,
     "skipLibCheck": true,
     "isolatedModules": true,
+    "composite": true,
     "declaration": true,
     "sourceMap": true,
     "declarationMap": true,

packages/graphql/test/mutation-engine/visibility.test.ts

@@ -184,7 +184,9 @@ describe("GraphQL Mutation Engine - Visibility Filtering", () => {
       expect(mutation.mutationNode.isReplaced).toBe(true);
       const replacement = mutation.mutationNode.replacementNode!.mutatedType;
       expect(replacement.kind).toBe("Scalar");
-      expect(replacement.name).toBe("ReadOnlyModelInput");
+      if (replacement.kind === "Scalar") {
+        expect(replacement.name).toBe("ReadOnlyModelInput");
+      }
     });
 
     it("strips @compose from input variants to avoid spurious validation", async () => {