Add Julia script to generate test model files

[rafabench]

Summary

• Add test/generate_models.jl that programmatically generates all model files in test/models/ using MathOptInterface
• Replaces hand-crafted data files with a reproducible generation pipeline
• Regenerated model files produce identical test results (all 121 tests pass)

Run with: julia --project=. test/generate_models.jl

🤖 Generated with Claude Code

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.66%. Comparing base (7a1aace) to head (03d6ddc).
⚠️ Report is 2 commits behind head on master.
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Additional details and impacted files

@@           Coverage Diff           @@
##           master       #9   +/-   ##
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  Coverage   72.66%   72.66%           
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  Files          10       10           
  Lines         578      578           
=======================================
  Hits          420      420           
  Misses        158      158           

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