Review code changes in dotnet/winforms for concrete problems. Always use this skill when GitHub Copilot code review is requested on a pull request, or when a user asks to review, inspect, audit, or check a PR, branch, commit range, staged changes, uncommitted changes, or local changes in this repository. Supports hosted GitHub.com reviews that post findings directly and interactive reviews of local or remote changes. Focus on correctness, compatibility, native resource and handle lifetime, designer serialization, accessibility, DPI/rendering, performance, security, and regression coverage; omit praise, style-only nits, and speculative concerns.