Add mutate() to the shared concept inventory and a shell mutation check: a
nav-row min-height rule and a removed .breadcrumbs each make the comparison
fail with the changed path. Harden the resolver-failure guard test with an
injection count, make the overlay lint fail when workspace.css is missing,
mark the library.css .row-actions leftovers for PR E, and document the
concept CSS base, the overlay lint, the comparison method and the recorded
shell deviations in TESTING.md.
Vito Sansevero
69d201d684