Write findings for an exception's lines

Upserts one finding per record of the exception — the note, status and suggested action your reviewers see on each open line. Findings are keyed on (exception, record), so sending the same record again replaces its finding. Up to 1,000 findings per request; each is validated independently and the response lists the rejected ones, so a partial batch still writes. Records already matched by rules do not need findings — write them for the lines that are left.