fix(e2e): use --import for Sentry ESM init in node-express-mcp-v2

The app runs as ESM ("type": "module") because the MCP SDK v2 packages
are ESM-only. Sentry must be loaded via --import before the app module
to instrument Express correctly; importing it inside app.ts is too late.

Extracts Sentry.init() into instrument.mjs and starts the app with
node --import ./instrument.mjs dist/app.js, matching the pattern used
by tsx-express.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: betegon

dev-packages/e2e-tests/test-applications/node-express-mcp-v2/instrument.mjs

@@ -0,0 +1,9 @@
+import * as Sentry from '@sentry/node';
+
+Sentry.init({
+  environment: 'qa', // dynamic sampling bias to keep transactions
+  dsn: process.env.E2E_TEST_DSN,
+  debug: !!process.env.DEBUG,
+  tunnel: `http://localhost:3031/`, // proxy server
+  tracesSampleRate: 1,
+});

dev-packages/e2e-tests/test-applications/node-express-mcp-v2/package.json

@@ -4,7 +4,7 @@
   "private": true,
   "scripts": {
     "build": "tsc",
-    "start": "node dist/app.js",
+    "start": "node --import ./instrument.mjs dist/app.js",
     "test": "playwright test",
     "clean": "npx rimraf node_modules pnpm-lock.yaml",
     "test:build": "pnpm install && pnpm build",

dev-packages/e2e-tests/test-applications/node-express-mcp-v2/src/app.ts

@@ -1,13 +1,4 @@
 import * as Sentry from '@sentry/node';
-
-Sentry.init({
-  environment: 'qa', // dynamic sampling bias to keep transactions
-  dsn: process.env.E2E_TEST_DSN,
-  debug: !!process.env.DEBUG,
-  tunnel: `http://localhost:3031/`, // proxy server
-  tracesSampleRate: 1,
-});
-
 import express from 'express';
 import { mcpRouter } from './mcp.js';