ci: temporary campaign test matrix

[kevincostner17]

Description

Please include a summary of the changes and the related issue/feature description.

Fixes # (issue number if applicable)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor / Style / Performance improvement

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Type checks (mypy) and linter checks (ruff) pass locally

[coderabbitai]

Important

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[github-actions]

FreshData benchmark report — performance

• freshdata: ?
• python: ?
• platform: ?

fixture	n_rows	n_cols	p50 s	p95 s	peak MB	repair %	false-repair %	preserve %	trust	monotonic	export %

Authored-code reduction (Metric 6)

[kevincostner17]

Temporary campaign test-matrix branch; its purpose (cross-OS validation, incl. the Windows sandbox fix #431) is complete. Closing and deleting the branch.