A distributed workflow needs a localized repair without weakening observability or rollback safety. The affected area is cache boundary.
Repair the cache boundary command handling implementation so it accepts first operations, recognizes safe repeats, and rejects key reuse with a different payload.
Evidence
- Affected surface: Full-stack backend focus / cache boundary.
- Observed failure family: enforce idempotent operations.
- Scope policy: retained must equal true.