Expose dataset/conversion scripts as uv entry points

scripts/ is now a proper package (scripts/__init__.py, added to the wheel's
packages), with each script registered under [project.scripts] using its
bare dashed name (e.g. `uv run migrate-geant-steps`). Tests now import these
modules normally instead of loading them by file path.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -37,13 +37,18 @@ analysis = [
 
 [project.scripts]
 giant = "giant.cli:app"
+steps-to-parquet = "scripts.steps_to_parquet:main"
+steps-to-parquet-parallel = "scripts.steps_to_parquet_parallel:main"
+migrate-geant-steps = "scripts.migrate_geant_steps:main"
+bump-dataset-version = "scripts.bump_dataset_version:main"
+create-root-files = "scripts.create_root_files:main"
 
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
 
 [tool.hatch.build.targets.wheel]
-packages = ["giant"]
+packages = ["giant", "scripts"]
 
 [tool.uv]
 conflicts = [