Recurrence 5 lookup certificate: B2A2 degree bound

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

theorem MazurTorsion.Kubert.OrderSevenBacktrackingCertificate.Internal.ResultantCertificate.recurrence5B2A2_natDegree_le : Polynomial.natDegree recurrence5B2A2 ≤ 313

theorem MazurTorsion.Kubert.OrderSevenBacktrackingCertificate.Internal.ResultantCertificate.recurrence5B2A2_coeff_high (n : ℕ) (h : 313 < n) : Polynomial.coeff recurrence5B2A2 n = 0