fix(settings): create parent dir in raw settings save path

The raw save path (saveRaw -> WriteFileAtomic) never created the parent directory, unlike the struct save path (saveToFile) it replaced. A raw enabled-flag flip in a repo that has never created .entire/ therefore hard-failed with "no such file or directory" (e.g. a bare entire disable in a fresh repo). MkdirAll the parent, mirroring saveToFile.