fix(code_execution): serialize record_result output as JSON #6495
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Summary
The record_result function was using value.display().to_string() which truncates nested arrays to 'Array(N)' format (e.g., 'items: Array(10)'), preventing models from seeing actual contents of tool results.
Changed to serialize values as JSON using to_json() and serde_json for proper array/object display. Falls back to display() for non-serializable values.
Type of Change
AI Assistance
[x] This PR was created or reviewed with AI assistance
Testing
Unit test and manually tested.