Two untracked-file management verbs over one shared control-name/sweep module (artifact §8 never-tracked superset; the .zit control files and derived sidecars are the exclusion set):

- extras: list files present in the working tree but not in the managed set and not control/derived files — the untracked surface, one path per line. - clean: remove those extras from the working tree, refusing to touch any tracked or control file; the sweep propagates allocation failure without leaking and never crashes on a hostile tree (fuzzed).

Slice tail: merge remains unshipped (its plan/implement agent repeatedly lost its API connection mid-response this session). Full unit + e2e (290/290) green on the merged trunk. check-in: bbfa0715f0 user: dmestas tags: trunk