* Simplify version creation logic in updateAgent function
* Add comprehensive tests for agent functionality including version history, action metadata generation, and loading agents
- Introduced tests for generating consistent hashes for action metadata.
- Implemented tests for loading agents with various scenarios including null and non-existent IDs.
- Added edge case tests for agent creation, updates, and error handling.
- Ensured proper handling of ephemeral agents and their associated functionalities.
* Enhance tests for Agent model functionality
- Updated test structure for Agent resource file operations, improving organization and readability.
- Added comprehensive tests for handling concurrent file additions and removals, ensuring data integrity.
- Implemented edge case tests for agent creation and resource file management, including scenarios with non-existent agents.
- Enhanced error handling in tests to cover various failure scenarios, ensuring robustness in agent operations.
* optimize tests
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