- Add upper bound to litellm constraint: litellm>=1.72.0,<2.0.0
- Enhance test suite with parameterized testing across multiple model types
- Add version constraint validation test to ensure proper bounds
- Improve test documentation with detailed explanations
- Add error handling enhancements as suggested in review
Addresses feedback from PR review by joaomdmoura in #3006
Co-Authored-By: João <joao@crewai.com>