operator
The human seat above the whole system. Owns the two boundaries: the contract going in, the doubt coming out.
The operator is the human above the whole system: me here, you in yours. Not the one writing each brief or merging each report; a model does that. The operator does the three things the system cannot do for itself: aim it at a problem worth solving, pour what you know into how it runs, and decide what to believe when it comes back.
The word earns its precision at the boundaries. The operator owns exactly two: the contract going in (every brief validated before a cent is spent) and the doubt coming out (no confident answer trusted unchecked). Everything between them can be delegated. The boundaries cannot, and a fleet is only ever as good as the operator holding them.