Target: every skill's description fits in a one-line gateway menu and
leads with trigger keywords an agent would match on. Drops filler like
'Use this skill to', 'A skill for', 'This skill provides'.
Before: max description length was 791 chars (architecture-diagram),
74 of 81 built-in skills were >60 chars.
After: max 60, mean 54, all 81 built-in skills <=60.
Rewritten with double-quoted YAML scalars to preserve Chinese/arrow
glyphs (baoyu-comic, yuanbao, youtube-content).
Adds the Hugging Face CLI (hf) reference as a built-in skill under
mlops/. Covers downloading/uploading models and datasets, repo
management, SQL queries on datasets, inference endpoints, Spaces,
buckets, and more.
Based on the official HF skill from huggingface/skills.
