@netbsd not sure if a specific policy is needed here.
1. The committing member is already responsible for copyright issues.
2. Whether code is generated by a technical system, or a natural neural net, doesn't make much difference on it's own in the suspicion of the code.
3. There are more tainted sources like stack overflow that would beg for a specific policy as well. Clarity and conciseness would suffer.
I think it should be a hiring policy instead.