stack/agents/gander/work/queue-253/run4-gate/PREPARATION.md

Fresh run after mos-1297. No execution yet. Await Sage push gap and CLEAR.

Controls, M1-M40, focused RED/GREEN and touched whole files, CLI whole, WebUI whole, bus rebase union and ten shell suites all rerun. No carried results. Existing serial drivers and bounds remain unchanged; the whole-stage file list is byte-identical to run3.