Function write_coupling_csv 

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

DEEP-1, DEEP-2, DEEP-3: under --code-maat-compat, emit code-maat’s verbose 7-column shape with truncated-integer degree and the legacy column-name set (entity, coupled, first-entity-revisions, second-entity-revisions, shared-revisions). The Fisher exact p-value is a CodeLore extension with no code-maat equivalent and gets dropped under compat — migrating tools wouldn’t know how to interpret it anyway. CodeLore’s modern default keeps the 8-column shape with float degree and the always-verbose paired columns.