Correct me if I am wrong, but the whole premise is of Cursor and Windsurf is that this architect-editor mode already being built in into the editor. This is why there is a distinction between composer (Editor) and chat function (arhitecture).
Chat function is just chat; it can't edit your files.
Composer probably relies on prompt engineering to do editor-architecture, as it reads and writes to your codebase. But it's heavily heavily to Sonnet 3.5 and tool-calling.
For architecture-type stuff, I prefer DeepSeek R1 as reasoning models do better on high level design. Which is why I will copy and paste in and out of compsoer.
