Pass one: the mechanical sweep
Run the draft through the checks before anyone edits it. Placeholders, unsourced figures, absolute claims, broken links, missing alt text, heading structure, stock phrasing.
Doing this first means the editorial pass is not interrupted by a TODO left in paragraph four, and the writer sees the whole defect list while the draft is still cheap to change.
Fix mechanical findings in the same sitting. They are almost all one-line changes, and leaving them open means they reappear in review.