Erase keeps record id, kind and time only; an unsalted hash confirms a
guessed text. Credential is the OIDC access token Bifrost issues to chat,
claims check open. Receiver store is a CultCache file with backup purge
owed before deploy. Receiver must not reuse CurrentBifrostActor.DisplayName;
no guest exists until Bifrost PR #9.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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