🧹 Extract try-catch from evaluateDocument into evaluateLine

[Horizontal42]

🎯 What: Extracted the inner try-catch logic from evaluateDocument into a separate evaluateLine method.
💡 Why: This clarifies the main evaluateDocument loop significantly, reducing the length and complexity of the function, which improves maintainability and readability.
✅ Verification: Verified by running the full test suite to ensure no functionality was altered.
✨ Result: A cleaner, more readable evaluateDocument method.

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PR created automatically by Jules for task 4475102563516748919 started by @Horizontal42

[google-labs-jules]

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