Bug Report: Missing Error Handling in Core Modules

Some core modules lack robust error handling. This may cause the application to crash or behave unpredictably when encountering edge cases or invalid input. Recommended actions:

- Review all core modules for unhandled exceptions and error-prone sections.
- Implement try/catch blocks and proper error propagation.
- Add tests to cover error cases and ensure the application fails gracefully.

Improving error handling will increase the stability and reliability of the project.

No files, tests, or entry points are named. Start by inventorying the core modules and locating unhandled exceptions or invalid-input paths, then identify the relevant error-handling tests. Done means identified edge cases fail gracefully, errors propagate consistently, and regression tests cover the changed paths.

Written by the indexing model from the issue text.