Expert code review with a senior engineer lens — covers architecture, SOLID principles, security vulnerabilities, performance, error handling, testing gaps, and API contract changes. Use this skill whenever the user asks to review code, check changes, audit a diff, look over a PR, find bugs in their work, or wants feedback on code quality. Also trigger when the user says things like 'review my changes', 'check this before I push', 'what do you think of this code', 'any issues with this?', 'code review', 'look this over', or 'is this ready to merge'. Works with any programming language and any size of change.
