Recurrence 2 lookup certificate: B4A6 degree bound

This is a checked coefficient-lookup shard for the second pseudo-division recurrence in the order-seven certificate.

theorem MazurTorsion.Kubert.OrderSevenBacktrackingCertificate.Internal.ResultantCertificate.recurrence2B4A6_natDegree_le : Polynomial.natDegree recurrence2B4A6 ≤ 233

theorem MazurTorsion.Kubert.OrderSevenBacktrackingCertificate.Internal.ResultantCertificate.recurrence2B4A6_coeff_high (n : ℕ) (h : 233 < n) : Polynomial.coeff recurrence2B4A6 n = 0