style: format expected json output in protocol test

packages/mcp-server/test/protocol.test.ts

@@ -176,7 +176,9 @@ describe("MCP protocol unstableFilter", () => {
 
     const body = await response.json();
     expect(body.result.content[0].type).toBe("text");
-    expect(JSON.parse(body.result.content[0].text)).toEqual([{ title: "item" }]);
+    expect(JSON.parse(body.result.content[0].text)).toEqual([
+      { title: "item" },
+    ]);
   });
 
   test("handler should forward unstableFilter=true for search_ebay", async () => {