If you're that focused on fitness functions, why not define it as the core of intelligence? Make an AI focused on evolving fitness functions for itself... without anything else, it might be an empty definition, but if you insert some other, trivial fitness criteria, such as maze navigation with least memory/processing... the trivial criteria would act as a "bottom", and the criteria of fitness would recursively build up from the bottom, hopefully making some general algorithms to apply to other AIs (if you get anything useful at all from such a process).
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