Function write_summary_csv 

pub fn write_summary_csv<W: Write>(
    rows: &[SummaryRow],
    w: &mut W,
    code_maat_compat: bool,
) -> Result<()>

code-maat’s summary emits statistic,value; CodeLore uses the slightly clearer metric,value. Under --code-maat-compat, emit the legacy header so downstream tooling (code-maat-targeted dashboards) keeps parsing.