Four-arm results: 505 stays positive (softer on deep history); liquid breadth
destroys book under current knobs. Stop tracking 1.3GB pkl cache under reports/.cache.
Pre-register A-D (4y/2016 x 505/505+liquid) with unchanged production knobs.
Runner caches full GTL candidates then re-ranks per arm; MacBook entry via
run_tier1_macbook.sh --prod-book-matrix.