The architecture carries correlated identity from the authoritative source through transformation, policy, AI or workflow processing, human approval, and the destination write. Contract tests and failure injection then show whether delayed, duplicated, malformed, unauthorised, and unavailable conditions produce the declared response without losing decisive context.
Handover records interface owners, supported versions, observability signals, unresolved dependencies, cutover sequence, and rollback authority. A sampled outcome should be explainable across system boundaries by the receiving team, including which evidence came from a third party and which behavior remains outside the organisation's control.