Agent Skills: learn

Multi-angle concept anatomy skill for a single concept or term. Breaks one idea into eight cuts, finds the shared deep structure, and compresses it into an org-mode insight note. Use when the user wants to deeply understand one concept, term, or idea from multiple perspectives, asks for 概念解剖 / concept anatomy / learn concept, or wants more than a plain-language paraphrase. Prefer this over `plain` when the goal is deep structure rather than simplification. Do not use it for quick rewrites, code walkthroughs, or multiple unrelated terms at once.