- install_skills_action: collect skills from both codex/skills/ (own) and codex/skills/thirdparty/ (thirdparty); mode=all installs both, mode=list searches both; log [thirdparty] tag for third-party installs - Update test_thirdparty_skills_pipeline: fix source_list path assertion - Update SKILLS.md: document thirdparty/ subdirectory structure Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>