feat: add copilot kit frontend option for agui protocol

[avi-alpert]

Description

Adds a CopilotKit frontend scaffolding option for agents using the AG-UI protocol. When users create an AGUI agent with --frontend copilotkit (or select it in the TUI wizard), a React chat UI is scaffolded alongside the agent that connects via the AG-UI streaming protocol.

This is supported for all AG-UI compatible frameworks:

• Strands
• LangChain / LangGraph
• Google ADK

TUI experience: During the interactive create/add-agent wizard, after selecting the AG-UI protocol, users are presented with a "Frontend" step asking them to choose between:

• Yes — CopilotKit — Chat UI with AG-UI streaming
• No — No frontend scaffolded

The scaffolded frontend includes:

• A Vite + React app with CopilotKit's chat component
• A bridge server (Hono + @copilotkit/runtime) that translates between CopilotKit and the AG-UI agent endpoint
• npm run dev runs both the bridge and UI concurrently

CLI usage:

agentcore create --name MyAgent --protocol AGUI --framework Strands --frontend copilotkit

Then:

agentcore dev --logs        # Terminal 1: start agent on :8080
cd app/MyAgent/frontend
npm install && npm run dev  # Terminal 2: UI on :3000, bridge on :3001

Related Issue

Closes #900

Type of Change

• New feature

Testing

• I ran npm run test:unit and npm run test:integ
• I ran npm run typecheck
• I ran npm run lint
• If I modified src/assets/, I ran npm run test:update-snapshots and committed the updated snapshots

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• My changes generate no new warnings
• Any dependent changes have been merged and published

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[github-actions]

Package Tarball

aws-agentcore-0.13.1.tgz

How to install

npm install https://github.com/aws/agentcore-cli/releases/download/pr-1240-tarball/aws-agentcore-0.13.1.tgz