The rebuild bodies read graphify-out/ and its .graphify_root relative to
the cwd, but git does not always start hooks at the top level. With
GIT_DIR exported and no GIT_WORK_TREE (a nested git call from another
hook or tool), git takes the caller's cwd as the work tree and
`git rev-parse --show-toplevel` echoes that subdirectory. A stray
graphify-out/ left there by an earlier run then roots the rebuild at the
subdirectory; for .claude/worktrees/ that walks every linked worktree.
The #3265 guard rejects a `..` marker, but its fallback is the same cwd.
Add a shared _TOPLEVEL_ANCHOR snippet right after _WORKTREE_GUARD in all
four hooks. In the standard layout it cds to the parent of the absolute
common .git dir; with GIT_WORK_TREE or a separate git dir it keeps git's
own --show-toplevel. GIT_DIR is rewritten to its absolute form so later
git calls still resolve. The block already runs in a subshell, so the cd
does not leak into chained hooks.
(cherry picked from commit e6193ab816)
dherreraj
5c3c47ebea