Merges policy layers (later layers win per knob) into a fully-resolved policy, applying defaults
and clamping every numeric knob into a safe range. An empty consumerDomains in a layer is treated
as absent (it would silently turn requireBusinessDomain into a no-op).
Merges policy layers (later layers win per knob) into a fully-resolved policy, applying defaults and clamping every numeric knob into a safe range. An empty
consumerDomainsin a layer is treated as absent (it would silently turnrequireBusinessDomaininto a no-op).