system-design-interview-builder

Turn system design interview material (YouTube transcripts, articles, book chapters, notes, URLs) into a complete Tough Tongue AI system design mock interview in the two-surface format: an interviewer-controlled notepad plus a candidate-owned architecture board. Authors the study guide, interviewer brain, hint ladder, and rubric, then creates the scenario with ttai:create_scenario. Use when the user says "create a system design interview", "turn this into a system design scenario", "new SDI for <question>", "board interview for <question>", or feeds interview prep material and asks for a scenario.