Assumption-first planning and design gap analysis. Use when user is in PLANNING mode, explicitly asks to plan or discuss, asks for a gap analysis / design review / stress-test of a spec or design document, or when agent faces open decisions — including headless tasks where the deliverable is proposals and open questions as files. Instead of interrogating the user, the agent proposes concrete tagged answers in small verify-style rounds (or directly in the output documents when no user is in the loop), surfaces contradictions as questions, and asks only the questions that genuinely fork the design.