we've faced this same problem but thinking about it a little deeper reminded me that this issue is no different to pre-llm world. someone creates a spec, someone or a team build/implement the spec and after actioning any feedback from testing or from customers, the product evolves and is no longer aligned with the initial spec.
i think one way to solve this is having an someone or an agent update the initial spec with any new changes as and when they are made.
i think one way to solve this is having an someone or an agent update the initial spec with any new changes as and when they are made.