Function read_tracking_tree 

pub fn read_tracking_tree(
    repo: &Path,
    remote: &str,
    ref_name: &str,
) -> Result<Vec<TreeEntry>, SyncError>

Reads the tree of a lore ref’s remote-tracking ref.

Convenience wrapper that resolves the tracking ref for ref_name on remote (see tracking_ref_name) and returns its tree entries, or an empty vector when nothing has been fetched into that tracking ref yet. Call after fetch to read remote state for merging.