The DSR walkers read the COLLECTION-level custom.pii map, which the
users collection never declared — Art. 15 export returned bare ids and
Art. 17 soft delete redacted nothing; the auth-injected email field in
particular was invisible (audit finding A5). Declares email (auto-added
by Payload auth: true), username and displayName as exportable +
restrictable; walker tests pin a users-shaped collection end to end.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>