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>

tests/test_bump_dataset_version.py

@@ -1,13 +1,4 @@
-import importlib.util
-from pathlib import Path
-
-# scripts/ is not an installed package — load the module straight from its path.
-_SPEC = importlib.util.spec_from_file_location(
-    "bump_dataset_version",
-    Path(__file__).resolve().parents[1] / "scripts" / "bump_dataset_version.py",
-)
-bump_dataset_version = importlib.util.module_from_spec(_SPEC)
-_SPEC.loader.exec_module(bump_dataset_version)
+from scripts import bump_dataset_version
 
 plan_bump_gen = bump_dataset_version.plan_bump_gen
 plan_bump_schema = bump_dataset_version.plan_bump_schema

tests/test_create_root_files.py

@@ -1,17 +1,10 @@
-import importlib.util
 import json
 import stat
 from pathlib import Path
 
 import pytest
 
-# scripts/ is not an installed package — load the module straight from its path.
-_SPEC = importlib.util.spec_from_file_location(
-    "create_root_files",
-    Path(__file__).resolve().parents[1] / "scripts" / "create_root_files.py",
-)
-create_root_files = importlib.util.module_from_spec(_SPEC)
-_SPEC.loader.exec_module(create_root_files)
+from scripts import create_root_files
 
 parse_detector_spec = create_root_files.parse_detector_spec
 next_shard_index = create_root_files.next_shard_index

tests/test_steps_to_parquet.py

@@ -1,15 +1,6 @@
-import importlib.util
-from pathlib import Path
-
 import polars as pl
 
-# scripts/ is not an installed package — load the module straight from its path.
-_SPEC = importlib.util.spec_from_file_location(
-    "steps_to_parquet",
-    Path(__file__).resolve().parents[1] / "scripts" / "steps_to_parquet.py",
-)
-steps_to_parquet = importlib.util.module_from_spec(_SPEC)
-_SPEC.loader.exec_module(steps_to_parquet)
+from scripts import steps_to_parquet
 
 
 def _frame() -> pl.DataFrame:

tests/test_steps_to_parquet_parallel.py

@@ -1,14 +1,7 @@
-import importlib.util
 import json
 from pathlib import Path
 
-# scripts/ is not an installed package — load the module straight from its path.
-_SPEC = importlib.util.spec_from_file_location(
-    "steps_to_parquet_parallel",
-    Path(__file__).resolve().parents[1] / "scripts" / "steps_to_parquet_parallel.py",
-)
-steps_to_parquet_parallel = importlib.util.module_from_spec(_SPEC)
-_SPEC.loader.exec_module(steps_to_parquet_parallel)
+from scripts import steps_to_parquet_parallel
 
 run_parallel = steps_to_parquet_parallel.run_parallel
 resolve_destination = steps_to_parquet_parallel.resolve_destination