chore: import upstream snapshot with attribution

examples/v2/runtime/express/.env.example

@@ -0,0 +1,2 @@
+OPENAI_API_KEY=your-openai-api-key
+PORT=4002

examples/v2/runtime/express/package.json

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+{
+  "name": "@copilotkit/example-runtime-express",
+  "version": "0.0.1",
+  "private": true,
+  "scripts": {
+    "example-dev": "tsx watch src/index.ts",
+    "example-build": "tsc",
+    "example-start": "node dist/index.js"
+  },
+  "dependencies": {
+    "@copilotkit/runtime": "workspace:^",
+    "express": "^4.21.2"
+  },
+  "devDependencies": {
+    "@copilotkit/typescript-config": "workspace:^",
+    "@types/express": "^4.17.21",
+    "@types/node": "^22.10.7",
+    "tsx": "^4.19.2",
+    "typescript": "^5.8.2"
+  }
+}

examples/v2/runtime/express/src/index.ts

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+import express from "express";
+import { CopilotRuntime, BuiltInAgent } from "@copilotkit/runtime/v2";
+import { createCopilotExpressHandler } from "@copilotkit/runtime/v2/express";
+
+const runtime = new CopilotRuntime({
+  agents: {
+    default: new BuiltInAgent({ model: "openai/gpt-5-mini" }),
+  },
+});
+
+const app = express();
+app.use(
+  createCopilotExpressHandler({
+    runtime,
+    basePath: "/api/copilotkit",
+  }),
+);
+
+const port = Number(process.env.PORT ?? 4002);
+app.listen(port, () => {
+  console.log(
+    `Express runtime listening on http://localhost:${port}/api/copilotkit`,
+  );
+});

examples/v2/runtime/express/tsconfig.json

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+{
+  "extends": "@copilotkit/typescript-config/base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "dist",
+    "module": "Node16",
+    "target": "ES2022",
+    "lib": ["ES2022"],
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "skipLibCheck": true,
+    "moduleResolution": "node16",
+    "resolveJsonModule": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}