Quality control at the handoffs, without over-engineering
Handoff gates: a grammar declared on an object type's transition, a deterministic check that refuses and returns weak work to the seat that produced it, and a judge with the seat's own rubric that passes, returns with a reason code, or escalates to a person. Why the next seat is not the judge, why there is no second review product, and what the first reference runs measured. vocion-core#672, #683.