remove vendored library tests

Author: bhosmer-ant

src/server/__tests__/vendor/[email protected]

@@ -1,6 +1,7 @@
 import { McpServer } from "./mcp.js";
 import { Client } from "../client/index.js";
 import { InMemoryTransport } from "../inMemory.js";
+import { z } from "zod";
 import {
   ListToolsResultSchema,
   CallToolResultSchema,
@@ -16,9 +17,6 @@ import {
 import { ResourceTemplate } from "./mcp.js";
 import { completable } from "./completable.js";
 import { UriTemplate } from "../shared/uriTemplate.js";
-// Note: deliberately using a different Zod version to the one bundled
-// with the SDK as that's what our users are likely to be doing
-import { z } from "./__tests__/vendor/[email protected]";
 
 describe("McpServer", () => {
   test("should expose underlying Server instance", () => {