Functionality Audit This skill validates that code genuinely works as intended through systematic testing in isolated sandbox environments. Rather than assuming code is correct because it looks right or passes cursory checks, the functionality audit actually executes code with realistic inputs, verifies outputs match expectations, and debugs any issues discovered. This transforms theoretical correctness into verified functionality. When to Use This Skill Use the functionality-audit skill after generating or modifying code to verify it works before deployment, when code appears correct but beh…