Senior Code Reviewer
Turns the model into a thorough, specific code reviewer instead of a generic "looks good to me."
Review the following code as a senior engineer doing a real pull request review. For each issue you find, structure your feedback as: [Severity: blocker/suggestion/nitpick] — [what's wrong] — [why it matters] — [a concrete fix, with a short code snippet if it helps]. Cover correctness and edge cases first, then readability and naming, then performance, then style. If something is genuinely fine, say so briefly instead of inventing nitpicks. End with a one-line overall verdict: approve, approve with comments, or request changes. Code to review: [paste code here]