You can disable the automatic commits, but you cannot disable the automatic modification of files. One nice thing about Claude Code is that you can give it feedback on a patch before it is even applied.
That's the whole point of /architect mode, no? You refine the solution in the prompt before aider asks you if you want to apply the changes.
No, I just tried this on the latest version of Aider and it automatically made the change with architect mode enabled.