Function write_ownership_csv 

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

Under --code-maat-compat, emit code-maat’s exact 3-column fragmentation output (entity,fractal-value,total-revs — note the column order; code-maat sorts the columns differently from CodeLore’s natural path / main_author / total_revs / fractal_value shape). CodeLore’s modern default surfaces main_author as a context column for triage (single-author file? long-tail file? the operator sees without re-running ownership).