🐛 Give the MCP plugin test the version check it calls

The connection metadata test runs plugin.ts with its imports replaced
by stand-ins. They lacked extractMinorVersion and isCompatibleVersion,
which plugin.ts calls on connect, so the test of an integrated plugin
that stays idle until connected failed. The stand-ins now pass the real
version check functions through.

mcp/packages/plugin/src/ConnectionMetadata.test.ts

@@ -7,6 +7,7 @@ import ts from "typescript";
 import { shouldReconnectAfterClose } from "./ReconnectPolicy.ts";
 import { SessionId } from "./SessionId.ts";
 import { SessionIdDisplay } from "./SessionIdDisplay.ts";
+import { extractMinorVersion, isCompatibleVersion } from "./VersionCompatibility.ts";
 
 /** Compiles the actual plugin entry point for a simulated browser boundary. */
 function compile(name: string) {
@@ -163,6 +164,8 @@ test("answers heartbeat requests once initialized, without forwarding them to th
  */
 const pluginModules = {
     ExecuteCodeTaskHandler: class {},
+    extractMinorVersion,
+    isCompatibleVersion,
     LocalStorageRollbackStore: class {},
     RollbackLog: class {
         listen() {}