Interview preparation workbench entry point. Runs the full pipeline from resume + target company + JD to a complete prep workspace (research, experience bank, verbatim scripts, industry brief), or routes to a single step. Use when the user says they have an interview coming up, wants interview prep, uploads a resume with a target job, mentions 面试准备 / 我要面试了 / 帮我准备面试 / 帮我把面试材料全做出来 / 一条龙, or asks "where do I start". Do NOT use for writing resumes from scratch, salary negotiation after offer, or live in-interview assistance.