KCAE.CHANGE:1 - Problem frame

Use this when sources, extraction, permissions, representations or cached judgements change while access continues or resumes after an interruption. A search hit and its opened passage can each be valid in isolation and form an invalid pair.

The gain is a truthful choice among coherent current access, identified historical access and a bounded degraded route. A frozen one-use dossier needs only a fixed source basis, not an elaborate generation service. More machinery becomes justified when concurrent readers, several stores or repeated refresh make that basis hard to preserve.