WalkFiles start-boundary divergence for a non-dot start: a start dir named in the skip set would now be walked and a regular-file start returns nil; unreachable today (both callers pass dot) — flag for any future caller passing a non-dot start

WalkFiles start-boundary divergence for a non-dot start: a start dir named in the skip set would now be walked and a regular-file start returns nil; unreachable today (both callers pass dot) — flag for any future caller passing a non-dot start

Grounds

• pursued: any start below the root yields exactly the whole walk's subset beneath it; shown wrong if a start path yields a file the whole-tree walk does not, which the test asserts for every case