⚡ Bolt: Replace df.iterrows() with df.to_dict('records')

[alinelena]

💡 What: Replaced df.iterrows() with df.to_dict('records') inside src/lavello_mlips/verify_processed_omol25.py.
🎯 Why: Iterating over pandas DataFrames using iterrows() is a known massive performance bottleneck because it yields a new Series object for every single row. Converting to a native Python list of dictionaries first completely bypasses this overhead, resulting in much faster execution for large parquet files.
📊 Impact: Significant reduction in verification time when matching datasets, avoiding pandas object instantiation per row.
🔬 Measurement: Run verify_processed_omol25 on a large test set and compare execution times; the to_dict('records') version should be orders of magnitude faster. Verified correctness via pytest.

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PR created automatically by Jules for task 12947904602993068091 started by @alinelena

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