chore: import upstream snapshot with attribution

examples/v2/node-express/README.md

@@ -0,0 +1,40 @@
+# CopilotKit v2 Express Example (Single Route)
+
+This example hosts a CopilotKit v2 runtime using Express and the single-route helper.
+
+## Setup
+
+```bash
+pnpm -C ../../ install
+```
+
+Create a local env file:
+
+```bash
+cp .env.example .env
+```
+
+Set `OPENAI_API_KEY` in `.env`.
+
+## Run
+
+```bash
+pnpm -C ../../ --filter node-express example-dev
+```
+
+The runtime will be available at:
+
+```
+http://localhost:4000/api/copilotkit
+```
+
+## Build
+
+```bash
+pnpm -C ../../ --filter node-express example-build
+```
+
+## Notes
+
+- This example uses `createCopilotEndpointSingleRouteExpress`.
+- TypeScript uses `moduleResolution: node16` to resolve the `@copilotkit/runtime/express` export correctly.