Load weights and data directly from HuggingFace

Fix Parquet loading (Polars lazy scan), PGN comment stripping, dashboard rosa support

Add UCI engine generation, Parquet data pipeline, and Lc0/Stockfish containers

Fix bugs, performance issues, and doc errors from code review

Safetensors migration, checkpoint integrity, and multi-model training. (#1)

Add type annotations across codebase and configure pyright

Move PAWN to open source repo.