and why should that be solved by "made by AI" being mandatory label when pretty much all of coding now involves it
I use agentic coding in my daily work. I do make mental model of the code I write and I also test the code, exactly the same way, as when written completely manually.
The distinction is probably not very important for small applications, as nobody cares if a minor script or a one-shot data processor has been vibe-coded, but for large applications it surely matters in the long term.