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Residency before placement
Where something may run is decided before where it will run. Residency rules filter the candidates first, so placement can only ever choose a compliant one.
Filter first, then choose
Residency obligations remove offerings from consideration before the placement resolver picks among the rest. A non-compliant choice is never made and then corrected.
A policy, not a contract clause
Residency is set per tenant and per data classification, and enforced as a substrate allow-list at the policy decision point.
It follows the data’s sensitivity
Because a residency policy can be set per classification, the most sensitive data can be held to a narrower set of places than the rest of the tenant.