test(mcp): retain distinct Objective-C class observations

Require both fixture addresses and unknown identity coverage when no selected-image binding proof permits coalescing.

tests/boundary/mcp/enhancedTools.01-lists-the-complete-target-open.test.ts

@@ -278,8 +278,12 @@ describe("enhanced MCP tools", () => {
       ),
     );
     expect(results[0]).toMatchObject({
-      count: 1,
-      classes: [{ address: "0x10", name: "_OBJC_CLASS_$_Fixture" }],
+      count: 2,
+      classes: [
+        { address: "0x10", name: "_OBJC_CLASS_$_Fixture" },
+        { address: "0x11", name: "_OBJC_CLASS_$_Fixture" },
+      ],
+      identity_coverage: { status: "unknown" },
     });
     expect(results[1]).toMatchObject({
       count: 1,