CultDocumentRegistry.Claimant is now the only precedence that decides which entry
reads a persisted catalog entry, static over a lookup (a registry's indexes, or the
entries a registry-less cacheless write writes). ClaimantEntry is deleted. A cacheless
WriteDocument or WriteRecord lent a registry is never more permissive than a cache
registering the same types; an unpublished id is carried, not owned, through Owns' catch.
Fixes the four Low findings of variants:verdict:cut-restamp-on-write.s2.
Not yet verified on Yggdrasil when committed.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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