fix(config): catch draccus DecodingError in CLI parsing - #4106 (#4260)

* Catch draccus DecodingError in CLI parsing, fix #4105

* Add regression test for draccus DecodingError handling

Covers exit code 1, concise single-line stderr message, and no traceback
on invalid typed CLI input, per review feedback on #4106.

* chore(config): try wrap

---------

Co-authored-by: ravindu somawansa <ravindu.somawansa@gmail.com>

src/lerobot/configs/parser.py

@@ -27,6 +27,7 @@ from typing import Any, TypeVar, cast
 
 import draccus
 import yaml  # type: ignore[import-untyped]
+from draccus.utils import DecodingError
 
 from lerobot.utils.utils import has_method
 
@@ -306,17 +307,21 @@ def wrap(config_path: Path | None = None) -> Callable[[F], F]:
                     # Also extract path fields from the YAML/JSON config file
                     if config_path_cli:
                         config_path_cli = extract_path_fields_from_config(config_path_cli, path_fields)
-                if has_method(argtype, "from_pretrained") and config_path_cli:
+                try:
-                    cli_args = filter_arg("config_path", cli_args)
+                    if has_method(argtype, "from_pretrained") and config_path_cli:
-                    cfg = argtype.from_pretrained(config_path_cli, cli_args=cli_args)
-                else:
-                    if config_path_cli:
                         cli_args = filter_arg("config_path", cli_args)
-                    cfg = draccus.parse(
+                        cfg = argtype.from_pretrained(config_path_cli, cli_args=cli_args)
-                        config_class=argtype,
+                    else:
-                        config_path=config_path_cli or config_path,
+                        if config_path_cli:
-                        args=cli_args,
+                            cli_args = filter_arg("config_path", cli_args)
-                    )
+                        cfg = draccus.parse(
+                            config_class=argtype,
+                            config_path=config_path_cli or config_path,
+                            args=cli_args,
+                        )
+                except DecodingError as e:
+                    print(f"error: {e}", file=sys.stderr)
+                    sys.exit(1)
             response = fn(cfg, *args, **kwargs)
             return response