This skill should be used when the user provides a strategy, plan, or decision document and wants to surface hidden assumptions and blind spots using the Known/Unknown 4-quadrant framework. Trigger on "known unknown", "4๋ถ๋ฉด ๋ถ์", "blind spots", "๋ญ ๋์น๊ณ ์์ง", "๋ญ ๋ชจ๋ฅด๋์ง ๋ชจ๋ฅด๊ฒ ์ด", "์ ๋ต ์ ๊ฒ", "์ ๋ต ๋ถ์", "assumption check", "๊ฐ์ ์ ๊ฒ", "quadrant analysis", "what am I missing". Strategy-level blind spot analysis with hypothesis-driven questioning. For requirement clarification use vague; for content-vs-form reframing use metamedium.