Systems, components, and constraints — design decisions as a readable structure.
系统、组件与约束：把“设计决策”写成可读的结构。
One sentence: what constraint did you turn into a feature?
一句话：你把哪个约束转化成了特性？
One sentence: what does the structure let the user do?
一句话：这个结构让用户更容易做什么？
One line: for what context / client / publication (optional)
一句：应用场景 / 客户 / 发布（可选）
