Shrink PyPI package artifacts

[anth-volk]

Fixes #948

Summary

• publish PyPI wheels only instead of building sdists
• move generated block geography prerequisites to pinned Hugging Face artifacts with SHA256 checks
• remove the large block geography files from Git/package data while preserving the runtime storage paths through prerequisite download

Testing

• make lint
• uv run --no-sync --with pytest --with huggingface_hub pytest tests/unit/storage/test_download_prerequisites.py
• uv run --no-sync --with pyyaml python scripts/run_quality_guards.py
• uv run --no-sync --with build python -m build --wheel
• verified pinned HF geography artifact download and hash checks manually