Function prepare_regular_file_beneath 

pub fn prepare_regular_file_beneath(
    root: &Path,
    path: &Path,
) -> Result<(), Error>

Prepare path beneath root for an ordinary read-modify-write that must not touch a user’s symlinks: missing parent directories are created, but an existing symlinked parent, or a symlink or non-regular file at the leaf, is refused rather than followed or replaced. Used where the path is a convention inside the repository (.claude/settings.json) that a tracked symlink may legitimately redirect elsewhere.