A production rollout exposes a contract mismatch between the UI boundary and the owning service. The affected area is notification center.
Repair the notification center tests implementation so it classifies stable, flaky, and consistently failing tests from repeated independent runs.
Evidence
- Affected surface: Balanced full-stack / notification center.
- Observed failure family: triage an unreliable test suite.
- Scope policy: cohort must equal stable.