Agent Skills: technical-review

Validate completed implementation against plan tasks and acceptance criteria. Sixth phase of research-discussion-specification-plan-implement-review workflow. Use when: (1) Implementation phase is complete, (2) User wants validation before merging/shipping, (3) Quality gate check needed after implementation. Reviews ALL plan tasks for implementation correctness, test adequacy, and code quality. Produces structured feedback (approve, request changes, or comments) - does NOT fix code.