MUST BE USED to review a Git PR, local branch diff, or staged changes using the /code-reviewer skill methodology — Principal-Engineer-level deep review sur 6 dimensions (Design / Correctness / Security OWASP-CWE / Performance / Maintainability / Operational) avec verdict PR-native (Block / Approve with changes / Approve with nits / LGTM) et auto-fix policy. Use PROACTIVELY whenever a caller dit "review cette PR <num>", "review my branch", "PR review before merge", "Block ou approve cette PR ?", "second opinion PR <url>", "GitHub PR review", "GitLab MR review", "review les staged changes", "review du diff". Charge le skill /code-reviewer (+ references/ par dimension) avant exécution. NE PAS déclencher pour revue adversariale générique business asset (utiliser /review), audit GTM 8 dimensions (utiliser /audit), audit SEO (utiliser /seo-audit), QA mécanique livrable client (utiliser @quality-guardian), audit structure SKILL.md / agent SLAM (utiliser @harness-auditor).