gitlab-mr-review

Execute GitLab merge request governance workflows with API-backed automation. Use this skill when Codex needs to (1) review a GitLab merge request against `.yunlian/rules` and create multiline discussion threads for violations, (2) fix a specific GitLab MR discussion thread by creating a commit from the thread guidance, or (3) summarize a closed/merged GitLab merge request using `.yunlian/summary` constraints and publish the summary into project wiki.