build-plan

Build a polished, self-contained HTML plan page (build plan, technical design plan, proposal, playbook, working doc) in the restrained white/ink/orange sidebar style, written in plain language with SVG diagrams carrying the ideas. Handles the user's repo logo, optional additional languages (any, and more than two; EN/中文 is just one example pair), and optional publishing to artifact.cafe for review. Use whenever the user asks for a build plan, design plan, technical planning doc, proposal page, review-ready plan HTML, "输出成 HTML 的方案", or wants to reuse the Campaign Agent plan look — even if they just say "make a plan page" without naming the style.