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Refactor Legacy Code

Improve readability without secretly changing behavior.

#refactor#code quality

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Act as a staff engineer. Refactor the following code for readability and maintainability, with the following hard constraints:

- Preserve the exact public API — no rename or signature change.
- Preserve runtime behaviour — no functional changes.
- Do not introduce new dependencies.
- Add comments only where the WHY is non-obvious; never repeat the code in English.

For each change you make, list it in a short bulleted summary at the top with one-line justification.

Code:
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refactor this code

Why it works

Hard constraints prevent the model from 'helpfully' breaking things.
The change summary at the top gives you a diff-free way to review intent.
Comment rule prevents over-commenting noise.

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