🧪 Add unit test for ToolError::missing_field constructor

[Hmbown]

🎯 What: The testing gap addressed
This PR addresses the lack of test coverage for the ToolError::missing_field variant constructor in crates/tools/src/lib.rs.

📊 Coverage: What scenarios are now tested
A new unit test tool_error_missing_field_constructor was added to verify that calling the missing_field constructor correctly builds the ToolError::MissingField enum variant with the provided string payload.

✨ Result: The improvement in test coverage
Increased test coverage for ToolError helper constructors, ensuring refactoring safety.

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PR created automatically by Jules for task 9709596818144160378 started by @Hmbown

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Code Review

This pull request adds a new unit test, tool_error_missing_field_constructor, to verify the behavior of the ToolError::missing_field constructor in crates/tools/src/lib.rs. I have no feedback to provide as the changes are straightforward and there are no review comments.

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