333c4f9a61 and 244f4965dc landed six exports with no production
consumers, failing the hard-zero deadcode gate on every PR: a dead
re-export block in restart-handoff (the contract module's real importer
uses it directly), three result/mode types only referenced inside their
own modules, and two supervision symbols whose only consumers were their
tests. The types and helpers stay defined for the in-flight supervisor
work to re-export alongside real consumers; the supervision test now
proves mode resolution through the public isGatewayExternallySupervised
surface.
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