Add automated CSV export functional test with multi-language performance benchmarking#4

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Copilot wants to merge 7 commits intomainfrom

copilot/add-automated-csv-export-test

Commits on Nov 16, 2025

Initial plan
Copilot
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Add automated CSV export functional test with mock data and GitHub Actions workflow

Copilot
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gilles-g
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Add explicit GITHUB_TOKEN permissions to workflow for security

Copilot
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gilles-g
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Add comprehensive documentation for CSV export functional test

Copilot
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gilles-g
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Update CSV export workflow to use Symfony 6.4 with PHP 8.2 only

Copilot
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gilles-g
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Add performance testing with large volume data and hyperfine benchmarks

Copilot
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gilles-g
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Add C and Rust generators with batch performance comparison

Copilot
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gilles-g
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