differential-review

Runs security-focused differential reviews on PRs, commits, and diffs. Scales analysis depth to codebase size, calculates blast radius for high-risk changes, checks test coverage gaps, and writes a markdown report file. Detects security regressions by tracing git history on removed code. Manual diff review skips git blame on removed code and rarely quantifies how many callers a changed function has, so regressions slip through without the structured blast radius and adversarial modeling this skill enforces.