Adds Hugging Face's official skill catalog to the default GitHub taps and classifies it as a trusted source alongside openai/skills and anthropics/skills. - tools/skills_guard.py: huggingface/skills -> TRUSTED_REPOS - tools/skills_hub.py: GitHubSource.DEFAULT_TAPS += huggingface/skills (skills/) - website/docs: list it under default taps + trusted-source examples Closes #2549. Co-authored-by: teknium1 <127238744+teknium1@users.noreply.github.com>