fix: canonicalize duplicate witness terms in R1CS constraints [LA - C]#352
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…calization fix: canonicalize duplicate witness terms in R1CS constraints [LA - C]
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Summary
R1CS::add_constraintbefore inserting into sparse matrices, merging duplicate witness indices (summing coefficients) and dropping zerosdebug_assertinSparseMatrix::setto catch future regressions in debug buildsAddresses audit issue C (Least Authority, March 2026): duplicate witness terms in R1CS constraints silently overwrite coefficients via
SparseMatrix::set, underconstraining the circuit.Test plan
r1cs::tests