agent-ui demo

Setup

1. Clone langgraph repo and langgraphjs-api repo.
2. Checkout the following branches:
   • langgraph: dqbd/sdk-js-react-ui
   • langgraphjs-api: dqbd/api-ui
3. Run npx packserve -d ../langgraph/libs/sdk-js ../langgraphjs-api/libs/langgraph-api ../langgraphjs-api/libs/langgraph-cli
4. Run pnpm install while running the packserve server

TODO: will create RC packages down the line, but just too lazy for now.