Function write_communication_csv 

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

Under --code-maat-compat the header uses code-maat’s author,peer column names (matching communication.clj’s output); CodeLore’s modern default uses the symmetric author-a,author-b pair which is clearer about the equality of roles.