Two skills in one plugin: (1) Automated git bisect for regression hunting — establishes boundaries, runs `git bisect run` with reproduction commands, analyzes the culprit commit, and suggests fixes. (2) Structured PR review — loads PR context via `gh` CLI, reviews across five dimensions (code quality, test coverage, security, performance, CI status), posts inline and general comments, handles approvals, and merges with the repo's preferred strategy. Includes safety rails: never merges without user confirmation, never force-pushes to protected branches. Requires `gh` CLI.