Two mutants that were green on HEAD's cells now die on named cells:
M-GUARD (all six _check_index call sites deleted) was rc 0 / Ran 12 on HEAD
and is rc 1 failing exactly the two new refusal cells; journalled path
compression passed all 12 HEAD cells and fails only the rebuilt compression
cell. Lane CHECK rc 0, Ran 232 (230 + 2). Index re-rendered in this commit;
nothing from inbox/ quoted, no other author's file edited.