fix: use consistent key naming in tracer output

[JohnGiorgi]

Summary

The trace_mapper() method in Tracer outputs a JSONL file with inconsistent key naming:

• original text (with a space)
• processed_text (with an underscore)

This PR fixes the inconsistency by changing original text to original_text, making both keys use snake_case.

# Before fix
- {"original text": "Hello friend", "processed_text": "Ahoy matey"}
# After fix
+ {"original_text": "Hello friend", "processed_text": "Ahoy matey"}

[gemini-code-assist]

Summary of Changes

Hello @JohnGiorgi, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on improving the consistency and predictability of the Tracer component's output. By standardizing the key naming convention in the generated JSONL files, it ensures a more uniform data structure, which can simplify downstream processing and integration for consumers of this trace data.

Highlights

• Key Naming Consistency: The pull request addresses an inconsistency in key naming within the JSONL output generated by the trace_mapper method in the Tracer component.
• Standardized Snake_Case: The key "original text" (with a space) has been updated to "original_text" (using snake_case) to align with the existing "processed_text" key, ensuring all keys follow a consistent snake_case convention.

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[gemini-code-assist]

Code Review

This pull request standardizes a key name in the tracer's output for better consistency, which is a good improvement. However, there are two issues to address. First, and most critically, the unit tests that rely on this key have not been updated, which will cause them to fail. The tests in tests/core/test_tracer.py must be updated within this PR. Second, to improve maintainability, the string keys "original_text" and "processed_text" should be defined as constants to avoid magic strings in the code.

[HYLcool]

Thanks for your contribution! And sorry for late response.