Review changed code for correctness, security, code quality, and performance. Use when the user asks to review code changes, a PR, or specific files. Invoke with `/review`, `/review <pr-number>`, `/review <file-path>`, `/review <pr-number> --comment` to post inline comments on the PR, `/review --fix` to apply the findings to your working tree, or `/review <pr-number> --resume` to continue an interrupted review of that PR instead of starting over. Add `--effort low|medium|high` to trade depth for speed (defaults to high for PRs, medium for local changes). Add `--topology minimal` to run the single-pass A/B comparison arm instead of the pipeline.