UC-015: Schema Drift on Connector Response

Layer: B — Dispatch Enforcement Threat: Schema Drift / Untrusted Connector Drift

Scenario

A connector returns a response whose schema does not match the pinned output contract. Fields are added, removed, or type-changed.

Expected Behavior

• Output schema mismatch → ERR_CONNECTOR_CONTRACT_DRIFT
• Execution halts at output validation
• Signed receipt produced with drift error

Pass Criteria

• Error code: ERR_CONNECTOR_CONTRACT_DRIFT
• Receipt: signed with OutputHash mismatch recorded
• No result propagated to caller