feat: 新增关于 pipeline_override 的文档，修复列表长度不匹配问题的说明

[overflow65537]

Summary by Sourcery

文档：

• 添加一份故障排查指南，解释 pipeline_override 列表长度不匹配的问题，以及覆盖 expected 和 threshold 字段的推荐模式。

Original summary in English

Summary by Sourcery

Documentation:

• Add a troubleshooting guide explaining pipeline_override list length mismatches and recommended patterns for overriding expected and threshold fields.

[sourcery-ai]

Hey - 我已经审查了你的更改，看起来很棒！

---

Sourcery 对开源项目是免费的——如果你喜欢我们的审查，请考虑分享它们 ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{帮我变得更有用！请在每条评论上点 👍 或 👎，我会根据这些反馈改进为你提供的审查。}

Original comment in English

Hey - I've reviewed your changes and they look great!

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.}