🧪 testing improvement: Add test for write_parquet_atomic parent directory creation

[edithatogo]

🎯 What: Missing test for write_parquet_atomic parent directory creation
📊 Coverage: Added parquet_atomic_write_creates_parent_directory test to cover nested parent directory creation
✨ Result: Successfully verified that write_parquet_atomic correctly creates nested parent directories prior to writing the Parquet file.

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PR created automatically by Jules for task 2568151747029006584 started by @edithatogo

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