## What changed
- Add nullable `multiAgentVersion` metadata to v2 `model/list` responses.
- Represent supported values as `disabled`, `v1`, or `v2` in the Rust API and generated JSON Schema and TypeScript exports.
- Forward the value from model catalog presets through app-server responses.
## Testing
- Extend the remote model catalog test fixture with a `v2` multi-agent version.
GitOrigin-RevId: bd3b2bbe0a3b562b4d1f03df7da2a73a35713978