Extraction widened to backend::serial::curve_models + edwards (v4 Aeneas,
183 defs, own gen/). Reference Ed* suite adapted: namespace + v4
SharedA/SharedB instance renames. All 20 proofs compile under lean-guard
(ReduceSpec needs an 8GB cap against the widened gen — contained by the
guard, documented). Both certificates axiom-clean.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
