refactor: streamline bert, update batch handling

[Septimus4]

Checklist

• [x] poetry run pytest passes locally with my changes
• [x] Tests have been added or updated to cover the changes
• [x] Documentation has been updated as needed
• [x] Code style checks pass
• [x] Commit messages follow the Conventional Commits guidelines

Affected Components

Description of Changes

Removed a commented-out line in bert.py and refined model loading message. Adjusted total batches for simulation, simplified newsgroup data fetching in concord.py, and added topic information printing.

Additional Notes