refactor(configs): export JobConfig from the configs package

Re-export JobConfig in lerobot/configs/__init__.py so external callers
import it as `from lerobot.configs import JobConfig`, matching the other
config classes. Adapt the train script and test imports.

src/lerobot/configs/__init__.py

@@ -22,7 +22,7 @@ Import them directly: ``from lerobot.configs.train import TrainPipelineConfig``
 """
 
 from .dataset import DatasetRecordConfig
-from .default import DatasetConfig, EvalConfig, PeftConfig, WandBConfig
+from .default import DatasetConfig, EvalConfig, JobConfig, PeftConfig, WandBConfig
 from .policies import PreTrainedConfig
 from .recipe import MessageTurn, TrainingRecipe, load_recipe
 from .types import (
@@ -55,6 +55,7 @@ __all__ = [
     "DatasetRecordConfig",
     "DatasetConfig",
     "EvalConfig",
+    "JobConfig",
     "MessageTurn",
     "PeftConfig",
     "PreTrainedConfig",

src/lerobot/scripts/lerobot_train.py

@@ -751,7 +751,7 @@ def _remote_target_in_argv() -> bool:
     """True when the CLI requests a remote HF Jobs run (--job.target=<non-local>)."""
     import sys
 
-    from lerobot.configs.default import JobConfig
+    from lerobot.configs import JobConfig
 
     target = None
     args = sys.argv[1:]

tests/jobs/test_job_config.py

@@ -15,7 +15,7 @@
 import draccus
 import pytest
 
-from lerobot.configs.default import JobConfig
+from lerobot.configs import JobConfig
 from lerobot.configs.train import TrainPipelineConfig