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This PR adds a `Constr:: PhantomBusInteraction` variant. For now, it is ignored - if users want to use a bus, they need to express this in terms of phantom lookups / permutations as before this PR. I added a few `TODO(bus_interaction)` and opened #2184 to track support for phantom bus interactions. One use-case this could have before though is to trigger a "hand-written" witness generation for the bus, as discussed in the chat.