Runs a structured multi-round interview to gather the user's preferences, context, and decisions on a topic — researching before and between rounds, opening an HTML briefing in cmux before each round, and closing with a summarize-back and a deliverable (spec, goal.md, plan, or decision log). Use when the user says "interview me", "ask me rounds of questions", "ask me questions to get my preferences / decisions", or wants requirements elicited before a spec or build.
