mesh/merge-gate pass: builds mesh-host → ace, g14, novox, shanks; no bus step; every machine composes with the change as it did without (4 of 4 compose)
mesh/repo-check pass: its merge-check.sh passed
mesh/delivery failed: its walk failed: a gate on a first machine (what it carried put back), a build, a machine
Confirmation pass of #66: the plan is a preview, and the removal reads the unit when it runs; a masked unit or one changed since is left as it is.