A production rollout exposes a contract mismatch between the UI boundary and the owning service. The affected area is account settings.
Repair the account settings command handling implementation so it accepts first operations, recognizes safe repeats, and rejects key reuse with a different payload.
Evidence
- Affected surface: Balanced full-stack / account settings.
- Observed failure family: enforce idempotent operations.
- Scope policy: tenantId must equal tenant-primary.