diff-review

Independent, diff-first code review of a change set. A dedicated reviewer reads the diff first with fresh context — no reliance on the implementation rationale — and reports correctness findings without editing the tree. Distinct from author self-review: it is the second, adversarial pair of eyes at a phase or PR boundary, focused on whether the code is actually correct. Use when the user invokes /diff-review, or says "review this diff independently", "do an independent code review", "review the branch before I merge".