Alpha 4: performance

Mostly some performance and logging / debugging improvements, along with some refactors.

What's Changed

• Update pre-commit hook versions by @mdekstrand in #594
• Add directory check in save_parquet by @samiravaez in #593
• Refactor Pipeline into private submodule and improve documentation by @mdekstrand in #595
• Speed up popularity scoring and top-N ranking by @mdekstrand in #597

New Contributors

• @samiravaez made their first contribution in #593

Full Changelog: v2025.0.0a3...v2025.0.0a4