Two layers decided independently what a reserved path is. update carried its own validateWorktreePath — an absolute/backslash/dot-dot check plus a hand-rolled case-insensitive comparison against the .zit family — while extras carried isControlName, which tested only the first /-delimited component of a path. They agreed by coincidence rather than construction, and the extras form admitted `.zit-managed/entries` because it asked about the component instead of the root.

control_paths now owns both questions. validateWorktreePath and isReservedRoot are the single definitions; update delegates to the first and extras to the second. isControlName takes the full root-relative key that add and move already hand it, so a path rooted in a control entry is refused at any depth rather than only at depth zero. firstComponent goes with its last caller.

The update test that pinned the old list is now a case table naming what is reserved and what merely resembles it, including the case-insensitive spellings the previous ad-hoc comparison happened to get right. check-in: 581db6e5ba user: dmestas tags: sub-manifest