🧹 [Code Health] Remove commented-out code in BitVector.py

[google-labs-jules]

🎯 What: Removed commented-out loop in BitVector.py during slice assignment.
💡 Why: Code clean up. Removing dead or commented out code improves readability and maintainability.
✅ Verification: Verified by running the full test suite (uv run pytest), which passed without issues. Removing comments has zero functional impact.
✨ Result: A cleaner source file with no behavioral change.

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PR created automatically by Jules for task 6475937863163507404 started by @schwehr

[google-labs-jules]

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