Interview the user in depth (via the AskUserQuestion tool) to turn a rough idea, plan file, or feature request into a concrete spec — then capture the result one of three ways. Use when the user runs /interview, or asks you to "interview me about this plan/feature", "grill me on the details", "flesh this out into a spec", or "turn this into Linear issues". Not for casual clarifying questions — this is a deep, iterative interview.
