assistant-ui Copilots Always consult assistant-ui.com/llms.txt for the latest API. Copilots ground an assistant in your running app: steer it with instructions, feed it lazy app state, let it read and drive rendered components, give it two way state through interactables, and share model context across an iframe boundary. References - ./references/instructions.md -- useAssistantInstructions - ./references/model-context.md -- useAssistantContext, imperative modelContext().register, ModelContextRegistry - ./references/visible.md -- makeAssistantVisible - ./references/interactables.md -- app-sco…