Plan Interrogate

It restates your design, maps out the decision tree, then drills through one question at a time in dependency order. Each question comes with a recommendation, not a survey. It checks the codebase first so you're not answering things already settled by existing constraints. You exit with a flat ledger of what was decided and why. Best for designs where the risk isn't complexity but ambiguity, where you need every assumption on paper before the first commit. Methodical in a way that feels slow until you avoid the three hour refactor.