What WOULD happen, row by row. Writes nothing.

Body: {"text": "pasted list or CSV"} or {"rows": [{email, name?, role?}]}, plus optional "group_id" and "role" (the default for rows that carry none).

A coordinator will paste the wrong column at least once. This is the screen where she finds that out, and it is computed by the same classify() the commit runs, so the table she confirms cannot disagree with the work.