Three sieves. Zero shortcuts.
It sorts stubborn stone until only the useful trouble remains.
Quarry clocks in below the last safe staircase. Angular stone enters at the top, misses three opportunities to reconsider, and leaves in smaller, more practical pieces. The outer ring keeps the shift moving. The sieves keep their own counsel. Dust gets everywhere, including the lunch tin nobody admits is theirs. Nobody has found an off switch, which saves time.
Six operating rules, all learned the loud way underground.
Built under pressure.