Validate cached matvec public values in NeutronNova prove#121
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prep_prove caches full matrix-vector products for step circuits when num_challenges==0 and num_rest_unpadded==0. The cache includes public values in the z vector, creating an implicit invariant that prove must be called with the same step circuits. Add an explicit check: store the public values used during prep_prove and compare them in prove before using the cache. Return InternalError if the values diverge, preventing stale cache from producing incorrect proofs.
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prep_prove caches full matrix-vector products for step circuits when num_challenges==0 and num_rest_unpadded==0. The cache includes public values in the z vector, creating an implicit invariant that prove must be called with the same step circuits.
Add an explicit check: store the public values used during prep_prove and compare them in prove before using the cache. Return InternalError if the values diverge, preventing stale cache from producing incorrect proofs.