Review round 2 on PR #189: CreateRegular (promote's and reject's only write path) had no test; replacing mkdirReal with root.MkdirAll, dropping cleanRel or calling PutRegular all stayed green, and the promote/reject test planted only outside targets, which os.Root refuses on its own. - TestCreateRegularCreatesOnlyNewFilesThroughRealDirectories: in-brain symlinked parent, unclean path, existing file and dangling link (fs.ErrExist, nothing changed), positive control with missing parents. - TestPromoteAndRejectRefuseAnInBrainSymlinkedDestinationDirectory. All three flips are red now. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>