> For the complete documentation index, see [llms.txt](https://code-visualization.shawnxie.top/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://code-visualization.shawnxie.top/di-si-pian-san-ge-he-xin-gong-cheng-chang-jing.md).

# 第四篇：三个核心工程场景

- [代码库理解与上下文构建](https://code-visualization.shawnxie.top/di-si-pian-san-ge-he-xin-gong-cheng-chang-jing/codebase-understanding.md)
- [变更影响分析与验证](https://code-visualization.shawnxie.top/di-si-pian-san-ge-he-xin-gong-cheng-chang-jing/change-impact-verification.md)
- [架构理解与遗留系统改造](https://code-visualization.shawnxie.top/di-si-pian-san-ge-he-xin-gong-cheng-chang-jing/architecture-and-legacy-modernization.md)