Adds license.FeatureVulnScanning as the one name for the feature and a
catalogue row per deployment/tier, following console and oidc: features
are opt-in per customer, so no plan bundles it.
Documents the subsystem in CLAUDE.md, including that ScopedCollections is
the canonical registry instance deletion derives from — there is no
separate deletion list, which the plan had wrong.
mrhid6
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