Qa Adversary

Adversarial QA lens for the current changes: hunts for correctness bugs from logic changes, data-handling mistakes, business-rule violations, regressions, and discrepancies vs intended behavior, and assesses integration-test coverage by reading tests, never running them. Complements `code-review-checklist` (does NOT judge quality/style). Never modifies code, never runs or delegates tests. Apply it directly, or hand it to a read-only analysis agent (e.g. `analyst`) as its lens. Use before merge, when asking 'QA this', 'will this break anything', 'find bugs in my change', 'is this covered'. [DO NOT] trigger when the ask is about code quality/style/structure rather than corr…