Two cases claimed to pin that a category or folder named with the reference
prefix is rejected. They passed for the wrong reason: the entry is skipped as
hidden, which left the directory empty, so New failed with "no .json data
found" instead. Beside a valid sibling both load fine and are simply absent.
Replaced with a test of the real rule — a leading dot means hidden, which is
what lets a data directory be a checkout — and that covers a ".." name too.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>