The default differential run can select fewer covered sites than exist after a
function is added or removed, forcing a manual --mutate-all rerun. Add
mutate-file.sh (auto-reruns when Selected < Covered) and clean-builds.sh
(removes worker-copy bloat), and document them plus the intrinsic upper-bound
Gherkin survivors in the architect cheat-sheet.
By specifier.
Chris Troutner
752bf2cff6