Function compact_call_label 

fn compact_call_label(
    provider_id: &str,
    contract_id: &str,
    args_json: &str,
) -> String

Compact one-line label for a do node: provider.leaf(short args). Collapses whitespace/newlines (run_command args are whole shell scripts) and elides past ~48 chars so the tree stays readable in both the log and the panel.