Suede Parity Contract

Iron Law: generate the contract from the reference surface's live constants.
A contract you transcribe is a second copy, and second copies drift.
A contract you generate cannot disagree with the code it came from.

Silent drift is the failure this prevents. Nothing crashes when a threshold is copied wrong into a second language. The two surfaces simply start answering the same question differently, and a user finds out before you do.

Step 1: Name one reference surface

Exactly one surface is the reference. Every other surface is a follower that asserts against it. Two references is two sources of truth with extra steps.

Pick the surface where the domain is most complete and most exercised, and write that choice into the contract's reference field so nobody re-litigates it.