docs(secrets): production replication topologies decided — OtOpcUa Akka pair-local, ScadaBridge central gRPC hub (pull-only); scadaproj#3
Design doc + runbook Production-enablement section + GAPS/index updates. The previously-untracked production-KEK decision is now recorded: one fleet-wide KEK via appsettings/env (never committed); ScadaBridge rejects the SqlServer hub on topology grounds (sites talk to central, never the DB) in favor of a new ZB.MOM.WW.Secrets.Replicator.Grpc package — pull-only, updates originate at central only, by design. Claude-Session: https://claude.ai/code/session_014WNM4vjoVksyyBraTXSZE1
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