code-review

Code review skill based on Sentry's engineering practices. Covers security vulnerabilities, performance issues like N+1 queries, test coverage gaps, and backwards compatibility. Includes tone guidelines for giving actionable feedback without blocking PRs on style. Instead of relying on ad-hoc instincts, you get a structured checklist that matches Sentry's actual engineering standards, including when to escalate to senior review and when to approve despite minor issues.