My answer is: use AI exactly for the tasks that you as a tech lead on a project would be ok delegating to someone else. I.e. you still own the project and probably want to devote your attention to all of the aspects that you HAVE to be on to of, but there are probably a lot of tasks where you have a clear definition of the task and its boundaries, and you should be ok to delegate and then review.
This gets particularly tricky when the task requires a competency that you yourself lack. But here too the question is - would you be willing to delegate it to another human whom you don't fully trust (e.g. a contractor)? The answer for me is in many cases "yes, but I need to learn about this enough so that I can evaluate their work" - so that's what I do, I learn what I need to know at the level of the tech lead managing them, but not at the level of the expert implementing it.
This gets particularly tricky when the task requires a competency that you yourself lack. But here too the question is - would you be willing to delegate it to another human whom you don't fully trust (e.g. a contractor)? The answer for me is in many cases "yes, but I need to learn about this enough so that I can evaluate their work" - so that's what I do, I learn what I need to know at the level of the tech lead managing them, but not at the level of the expert implementing it.