What does ljg-push do?
Sync all updated ljg-* skills from ~/.claude/skills/ to the GitHub repo (ljg-skills), pushing to master branch first (org-mode output style), then switching to md branch (markdown output style) for basic markdown conversion and push. Use when user says '/ljg-push', 'push skills', '推送 skills', '同步 skills', 'sync ljg', or whenever ljg-* skills get updated and need shipping. NOT FOR pushing non-ljg skills or arbitrary git repos.