'SelfManagement | 'IntegrationSurface | 'Internal, defaulting to 'Internal so a
manifest that never mentions it keeps validating.
Additive but ORDERED: Nickel record contracts are closed, so a consumer declaring
kind against a data-dir schema predating this field fails with `extra field kind`.
Reinstall precedes tagging. ontoref did not catch this on its own — its manifest
imports the schema source by relative path while every consumer imports the installed
copy, so the self-hosting project is the one project that structurally cannot feel
this class of break.
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