Adopt approval-engine's outbox wire as Gate House doctrine, specify the
heartbeat-and-reconciliation detection surface, and settle consumption
ordering: the PEP consumes by CAS before the side effect. T05's §11
check is written here and queued for statute v0.8.
Assistant: grok
Assistant-Session: 01a04d89-aaa5-7443-945e-b3055cd4b7e4
