Owns takes a condition on the claimant's answer (mayClaim): the cache arm accepts any
claimant, the cacheless arm only one of the entries the call writes. Another registered
type's record, under its current id or an old one it lists, is refused as at 0e57bf11.
Tests pin P1a/P1e/P1f shapes, the writer's own drift under a larger registry, and that a
second same-name type in the lent registry only refuses. CHANGELOG entry for the cacheless
claimant; stale comments on the store's owns predicate and WriteDocument's registry doc fixed.
Builds not yet run when committed; verified on Yggdrasil before push.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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