A cross-layer workflow passes unit tests but breaks when client, API, and persistence state arrive in a different order. The affected area is auth session.
Repair the auth session cache lifecycle implementation so it separates purge, refresh, and escalation actions by staleness and risk.
Evidence
- Affected surface: Full-stack backend focus / auth session.
- Observed failure family: plan cache invalidation.
- Scope policy: cohort must equal stable.