### Added
- Added `transport` setting (`"sse"`, `"websocket"`, `"auto"`) to `/settings` and `settings.json` for providers that support multiple transports (currently `openai-codex` via OpenAI Codex Responses).
### Changed
- Interactive mode now applies transport changes immediately to the active agent session.
- Settings migration now maps legacy `websockets: boolean` to the new `transport` setting.