<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
* **Bug Fixes**
* Enhanced error handling in retention category calculations to gracefully handle missing or invalid repositories, ensuring the system returns safe defaults instead of failing
* Optimized repository cache validation and lookup mechanisms for improved performance
* Strengthened repository validation checks to prevent potential calculation failures
<!-- end of auto-generated comment: release notes by coderabbit.ai -->