fixup(d1-base): add missing isStandardSchema import in rerere-merged mcp.compat.test.ts

Author: felixweinberger

packages/server/test/server/mcp.compat.test.ts

@@ -1,5 +1,6 @@
 /* eslint-disable @typescript-eslint/no-deprecated */
 import { z } from 'zod';
+import { isStandardSchema } from '@modelcontextprotocol/core';
 import { McpServer, ResourceTemplate } from '../../src/server/mcp.js';
 
 describe('McpServer v1-compat variadic shims', () => {