Agent Skills: word

Deep single-word English mastery skill. Unpacks one English word's semantic image, modern usage, confusion points, and memory hook. Use when the user wants to deeply understand one English word, asks for deeper meaning or usage rather than translation, or wants a memorable vocabulary breakdown. Prefer this over `plain` or `learn` for a single vocabulary item. Do not use it for phrases, sentence translation, or multiple words at once; route multi-word card workflows to `word-flow`.