The CDPATH regression was introduced when unifying completions: the `z`
function only checked `test -d` (absolute path existence) before falling
through to zoxide query, silently ignoring CDPATH-relative directories.
Now mirrors the completion logic — checks direct path, then each CDPATH
prefix, then zoxide — so `cd subdir` resolves correctly when `subdir`
lives under a CDPATH entry.
rootiest
05139354cf
