Enum field on Page (UNCLASSIFIED default, VS_NFD), migration backfills
existing pages. New pages take the instance-wide default from
classification.newPageDefault (admin-visible, de+en). The value rides in
every PageView, so no channel needs an extra request. The field is a
marking, not a protection mechanism: a test pins that permission
decisions are unchanged by it. The marking wording is fixed in ADR 0022
and sourced solely from classificationMarking() in @dorfteich/shared.
Co-Authored-By: Claude Fable 5 (1M context) <noreply@anthropic.com>