lib.Types: Accept bare string in LoadTypes()

LoadTypes() declares mod_names as Iterable[str], so passing a single
module name as a bare string is not caught at call time and the string
is iterated character by character at load time, producing a
ModuleNotFoundError for the first character instead of a clear error.

Normalize a bare string to a one-element list in __init__() and widen
the annotation accordingly, so that both forms work.

Assisted-by: unsloth/Qwen3.8-27B-GGUF:Q4_K_M with pi.dev v0.84.2
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/Types.py

@@ -44,11 +44,15 @@ class LoadTypes(Types[T]):  # export
 
     def __init__(
         self,
-        mod_names: Iterable[str],
+        mod_names: str | Iterable[str],
         type_name_filter: str | None = None,
         type_filter: Sequence[type[Any]] | None = None,
         debug_level: int | None = None,
     ) -> None:
+        # -- Accept a single module name as well, so that the common
+        # case does not require wrapping the name in a list.
+        if isinstance(mod_names, str):
+            mod_names = [mod_names]
         if debug_level is None:
             val = os.getenv('JW_LOG_LEVEL_LOAD_TYPES')
             if val is not None: