Function sync_pull 

pub fn sync_pull(
    cfg: &HubConfig,
    brain: &str,
    out: Option<&Path>,
) -> LinkResult<PullReport>

Pull the granted slice of brain to out (default: ./<slug>). Every exported path is safety-gated before it touches disk; files are written atomically; nothing local is ever deleted (locals the export lacks are reported in extra_local instead). Returns the report; rebuilding the local index catalog afterwards is the caller’s (cheap, optional) step.