tech-research-and-reuse
定义期第 3 步，技术调研与复用：在需求、不变式与总边界之下选技术，先找现成的库、相近系统或社区实现，自造要有论证。总边界定好，或人说「有没有现成的」「选型」「要不要自己写」时加载。实现里顺手选一个库不加载。
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