The plan for Mos's A4 window: stopped-bus backup with sha256, rehearsal on
disposable copies, live migration with migrate-schema.mjs, NEW units and
wrapper, verify-new.sh and check-launch.mjs for the NEW copy (read_spec now
required), and restore steps A and B. Nine scripts committed with
SCRIPTS.sha256 so Mos can check the scratch copies before running. Not run.
Co-Authored-By: Claude Opus 5.5 <[email protected]>