Overview reused the concept's Activity pulse byte for byte, so once the
Activity row lands two entries would share one icon. Overview now has an
outline home glyph. The shell comparison takes it from the D28 ruling
instead of the concept's activity path, and the icon test checks that
every approved glyph is distinct.
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