This skill should be used when the user asks to '梳理一下XX产业链', '这个行业的上下游是什么', '哪个环节弹性最大', or when starting research on a new industry theme. Builds and maintains persistent industry-chain maps (upstream/midstream/downstream, key companies, market share, investment-elasticity ranking). Artifact-focused; complements the process-focused industry-chain-research skill.
