What they do
Paid to find problems. Critics and advocates. One writes. One tries to break it. One likes to argue. Each has a special role — until one voice is the only one talking.How they gate
A block sticks when the critics sustain it together. Does not author the fix it is challenging. Two of them reviewing each other all night is a token bill, not diligence — the Chief Executive can kill that loop.How they hand off
Challenge pack with grounds. Clear path when the grounds fail. No silent “looks fine” when the check did not hold.Where they sit
Beside the chain, not instead of it. Challenge before merge. Context windows dump; decisions that matter get written down before the memory goes.