Count number of nonzeros

[danielelerede-oet]

This PR adds the possibility to reckon the n. of nonzeros alongside variables and constraints and updates metadata consequently. In addition, the benchmark files are now only stored temporarily for the analysis.

Fixes #413

Checklist

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• I have tested my changes by running the website locally

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Project	Deployment	Actions	Updated (UTC)
solver-benchmark	Ready	Preview, Comment	Feb 23, 2026 4:54pm

[eantonini]

Thanks for adding this new feature.

Since you are at it, would you mind updating the categorize_benchmark.py script with the suggestions on Python best practices that I shared on Discord?

[danielelerede-oet]

Thanks for adding this new feature.

Since you are at it, would you mind updating the categorize_benchmark.py script with the suggestions on Python best practices that I shared on Discord?

@eantonini In addition to applying the requested best practices (modularity, type hints, NumPy-style docstrings), this refactor also introduces small structural improvements (dataclasses for typed model stats, structured processing summary, and clearer separation of concerns) without changing the original behavior of the script