Stepwise Problem Statement and Value Proposition (USP) builder for strategy sprints and marketing planning. Use this skill when someone explicitly wants to craft, evaluate, or critique a Problem Statement, Value Proposition, or Unique Selling Proposition. Trigger on phrases like "write a problem statement", "build our USP", "craft our value prop", "let's work on our messaging", "define the customer pain", "score my USP", or "critique this problem statement." Also trigger when a user shares a draft Problem Statement or USP and wants feedback. Do not trigger for general marketing questions, channel strategy, or campaign work unless the user explicitly asks to build or evalu…