[BUG] Fluency Score - Customization adoption rate is incorrect

**Describe the bug**

The customization adoption rate incorrectly states 100% adoption:

<img width="814" height="494" alt="Image" src="https://github.com/user-attachments/assets/c5ad5bf3-290d-48fd-9b93-0b8b462de73e" />

Even though I have worked with a repository over the past 30 days (with Copilot) that doesn't have any customizations in place.