> For example, if 'you' agreed to develop a piece of software 'exclusively' for the customer, and then use AI to create substantial parts of the software, then neither it was 'you' who developed that, nor was it 'exclusively' for the customer

On the other hand, if ‘you’ had taken no action at all, then there would be no software at all. The actions by ‘you’ are necessary for the software to exist, so the argument must be about whether those actions count as development or not. Is the definition of development written down anywhere?