chore: import upstream snapshot with attribution

examples/v2/runtime/node/.env.example

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+OPENAI_API_KEY=your-openai-api-key
+PORT=4001

examples/v2/runtime/node/package.json

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+{
+  "name": "@copilotkit/example-runtime-node",
+  "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:^"
+  },
+  "devDependencies": {
+    "@copilotkit/typescript-config": "workspace:^",
+    "@types/node": "^22.10.7",
+    "tsx": "^4.19.2",
+    "typescript": "^5.8.2"
+  }
+}

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

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+import { createServer } from "node:http";
+import {
+  CopilotRuntime,
+  createCopilotRuntimeHandler,
+  BuiltInAgent,
+} from "@copilotkit/runtime/v2";
+import { createCopilotNodeHandler } from "@copilotkit/runtime/v2/node";
+
+const runtime = new CopilotRuntime({
+  agents: {
+    default: new BuiltInAgent({ model: "openai/gpt-5-mini" }),
+  },
+});
+
+const copilotHandler = createCopilotRuntimeHandler({
+  runtime,
+  basePath: "/api/copilotkit",
+  cors: true,
+});
+
+const copilotNodeHandler = createCopilotNodeHandler(copilotHandler);
+
+const server = createServer(async (req, res) => {
+  const url = new URL(req.url ?? "/", `http://${req.headers.host}`);
+
+  // CopilotKit endpoints
+  if (url.pathname.startsWith("/api/copilotkit")) {
+    return copilotNodeHandler(req, res);
+  }
+
+  // Root
+  if (url.pathname === "/") {
+    res.writeHead(200, { "Content-Type": "application/json" });
+    res.end(
+      JSON.stringify({ status: "ok", message: "CopilotKit Node runtime" }),
+    );
+    return;
+  }
+
+  // Health check
+  if (url.pathname === "/health") {
+    res.writeHead(200, { "Content-Type": "application/json" });
+    res.end(JSON.stringify({ status: "healthy" }));
+    return;
+  }
+
+  // 404
+  res.writeHead(404, { "Content-Type": "application/json" });
+  res.end(JSON.stringify({ error: "Not found" }));
+});
+
+const port = Number(process.env.PORT ?? 4001);
+server.listen(port, () => {
+  console.log(`Node runtime listening on http://localhost:${port}`);
+  console.log(`  CopilotKit: http://localhost:${port}/api/copilotkit`);
+});

examples/v2/runtime/node/tsconfig.json

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+{
+  "extends": "@copilotkit/typescript-config/base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "dist",
+    "module": "es2022",
+    "target": "ES2022",
+    "lib": ["ES2022"],
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "skipLibCheck": true,
+    "moduleResolution": "bundler",
+    "resolveJsonModule": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}