Attention is the scarce resource
You never have enough Focus to check everything. The skill is reading the risk in a request (vague wording, payments, migrations, traffic spikes) and putting human judgment there.
You lead the chess-game team for six sprints, releases 1.5 to 1.10. Coding agents write the features, and every feature hides gremlins. Gates and agents catch some of them. The rest only get caught if you spend your attention in the right place.
You never have enough Focus to check everything. The skill is reading the risk in a request (vague wording, payments, migrations, traffic spikes) and putting human judgment there.
Unit, SAST and mutation gates catch mechanical bugs on every PR without anyone looking. Buying them early frees your Focus for the problems they can't see.
Planner, coders, reviewer and SRE agents do most of the work. They also write most of the gremlins, which is why the layers around them exist.
No single check is enough. Ambiguity dies at Intent, security at Verify, blast radius at Review, scale at Release. The season report shows which layers did the work.