ENG12 figure review

A version-one client is separated from the rewritten domain by an explicit compatibility adapter.
ENG12-v1
The naive response changes rounding, status type, calendar date and null presence while returning200.
ENG12-v2
The route changes patched to adapter and back, with three golden requests at every stage.
ENG12-v3
Both stateless implementations are evaluated and compared while the established response is returned.
ENG12-v4
Nine golden, ten negative, three shadow and one intentional mismatch observation support the contract claims.
ENG12-v5

Motion

Conceptual transition