Enhance audio tests with soundfile imports
Added missing 'soundfile' imports in multiple test functions within test_audio.py to ensure proper functionality and avoid import errors.
refactor: remove dead Date64 handling code from CSV writer
Date64 is converted to Timestamp[ms] by Daft upon ingestion, so the
Date64 match arm in transform_batch was dead code. This removes it
and adds a comment explaining why Date64 is not handled separately.
The test_write_csv_date64_with_timestamp_format test correctly uses
timestamp_format (not date_format) because the data arrives as
Timestamp[ms] by the time it reaches the CSV writer.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>