[Feature]: Implement dummy agent trait

[Adoxcol]

Summary

This PR implements the AgentTrait for DummyAgent in the test suite, resolving compilation errors and ensuring all agent tests pass successfully.

Changes Made

🔧 Implementation Details

• File Modified : tests/rust_unit_tests/agent_tests.rs
• Primary Change : Implemented all required methods for AgentTrait on DummyAgent

📝 Specific Changes

1. Added process_message method :

   • Returns a simple AgentMessage using the built-in constructor
   • Handles async processing requirements
   • Uses proper error handling with ValidationError
2. Added get_capabilities method :

   • Returns an empty HashMap<String, String> for test purposes
   • Satisfies trait requirements for capability reporting
3. Fixed import statements :

   • Corrected module imports for graphbit_core components
   • Removed unnecessary external crate dependencies
   • Fixed syntax errors in import declarations
4. Code formatting :

   • Applied cargo fmt standards
   • Fixed missing comma in error construction
   • Ensured consistent code style

Testing Results

✅ Unit Tests

✅ Code Quality Checks

• Formatting : cargo fmt --check ✓ Passed
• Linting : cargo clippy --workspace ✓ No warnings
• Compilation : All code compiles successfully

✅ Integration Tests

• Agent tests now compile and run without errors
• DummyAgent properly implements all AgentTrait methods
• Test infrastructure is functional and ready for future development

Technical Details

Error Resolution

• Issue : Missing AgentTrait implementation causing compilation failures
• Solution : Implemented all required trait methods with appropriate signatures
• Approach : Used existing AgentMessage::new() constructor to avoid external dependencies

Code Architecture

• Maintains consistency with existing codebase patterns
• Uses proper async/await syntax for process_message
• Implements appropriate error handling with ValidationError
• Follows Rust best practices for trait implementation

Compliance Checklist

• Code compiles successfully ( cargo build )
• All agent tests pass ( cargo test agent_tests )
• Code formatting verified ( cargo fmt --check )
• Linting checks pass ( cargo clippy )
• Follows Rust best practices and conventions
• Implements all required AgentTrait methods
• Proper error handling implemented
• Memory safety maintained
• Async support properly implemented

Branch Naming

Following the project's branch naming convention: feature/implement-dummy-agent-trait

Impact

This change enables the test suite to compile and run successfully, providing a foundation for future agent development and testing. The implementation serves as a reference for other agent implementations while maintaining the simplicity required for testing purposes.

[jj-devhub]

@Adoxcol , address those conflict files to proceed for a proper code review