Python: Unit test coverage for core/workflows module

[TaoChenOSU]

Track and ensure that the core/workflows module in the GA package achieves 85% unit test coverage as part of the overall requirement. Report current coverage, test gaps, and actions required to meet the threshold. Document any challenges encountered specific to workflows unit tests and propose solutions as needed.

• Area: core/workflows
• Goal: ≥85% unit test coverage
• Track current status, gaps, actions and blockers

Any additional information about coverage tools, reports, or scripts can be added here as needed.