And can we talk about probability distributions only inside epistemic states computed by the AI, in a classical universe, for simplicity? (I'm skeptical that you've found an Oracle AI trick that works in quantum universes but not classical ones.)

Strongly agree. For any agent that doesn't have eccentric preferences over complex quantum configurations quantum uncertainty is be rolled up and treated the same way that ignorance based uncertainty is treated. In my own comments I tried to keep things technically correct and use caveats so as not to equivocate between the two but doing that all the time is annoying and probably distracting to readers.