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Alem Tuzlak cce5177af9 feat(examples): add React Router v7 example with TanStack AI agent (#3561)
## Summary

- Adds a new example app at `examples/v2/react-router` demonstrating
CopilotKit with React Router v7 (SSR/framework mode) and TanStack AI as
the default agent
- `TanStackAIAgent` wraps TanStack AI's `chat()` via a factory callback
pattern, giving users full type safety over adapter/model configuration
- CopilotKit runtime is mounted as a Hono route on the same server that
serves React Router SSR

## Key files

| File | Purpose |
|------|---------|
| `app/agent.ts` | `TanStackAIAgent` — thin `AbstractAgent` wrapping a
`chat()` factory, with AG-UI event normalization |
| `app/server.ts` | Hono server config mounting CopilotKit endpoint +
React Router SSR |
| `app/routes/_index.tsx` | Full-page `CopilotChat` UI |

## Notes

Discovered that TanStack AI's AG-UI events have subtle differences from
`@ag-ui/core` spec (extra fields, own type definitions instead of
importing from `@ag-ui/core`, own `runId`/no `threadId`). The
`TanStackAIAgent` normalizes these by consuming only text/tool deltas
from the stream and re-emitting clean `@ag-ui/client`-compatible events.
Will follow up with TanStack AI team on aligning their event types with
`@ag-ui/core`.

## Test plan

- [x] `pnpm build` passes
- [x] Dev server starts and serves the app
- [x] CopilotChat renders and streams responses from TanStack AI via
CopilotKit runtime
- [x] TypeScript type checks pass with zero errors

🤖 Generated with [Claude Code](https://claude.com/claude-code)
2026-04-01 11:58:13 +02:00
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