It is hard to imagine trusting an AI that much. But plenty of things happening today would've been hard to imagine by the people who came before. So yeah, let's make that assumption.
At that point, I don't think we'd be using the AI to code something and then switch to a mode where we're now using the recently-coded thing.
We'd just ask the the car to go, and it would happen. Then we'd suggest a strategy for making trades, and that would happen. If the AI decided to write some code and fork a subprocess along the way... that would be an detail that we'd be unaware of.
At that point, I don't think we'd be using the AI to code something and then switch to a mode where we're now using the recently-coded thing.
We'd just ask the the car to go, and it would happen. Then we'd suggest a strategy for making trades, and that would happen. If the AI decided to write some code and fork a subprocess along the way... that would be an detail that we'd be unaware of.