fix(opendss): restore OpenDSSDirect.py as a dev dependency

CHANGELOG.rst

@@ -3,6 +3,7 @@ Change Log
 
 [upcoming release] - 2026-..-..
 -------------------------------
+- [FIXED] restored ``OpenDSSDirect.py`` to the ``all``/``dev`` extras so the OpenDSS converter is exercised (and its coverage reported) in CI again; it was dropped in #3062 because installing it alongside ``pytest~=9.1`` crashes the pytest process on Windows (upstream bug, see `dss-extensions/OpenDSSDirect.py#148 <https://github.com/dss-extensions/OpenDSSDirect.py/issues/148>`_). The OpenDSS converter tests now skip on Windows instead of crashing the run; Linux/macOS are unaffected.
 - [ADDED] OpenDSS converter: series (bus-to-bus) ``Reactor`` elements are now imported as a fixed-impedance ``line``, the pattern some feeder libraries (e.g. EPRI's Ckt5/Ckt7) use to model the substation's Thevenin-equivalent source impedance instead of a ``Transformer``.
 
 [3.5.4] - 2026-07-08

pandapower/test/converter/test_from_opendss.py

@@ -12,11 +12,25 @@
 import promises for symmetric feeders.
 """
 
+import sys
+
 import numpy as np
 import pytest
 
 import pandapower as pp
 
+# On Windows, OpenDSSDirect.py's native backend crashes the whole pytest process
+# (not a catchable ImportError) when it is loaded through pytest's import machinery,
+# even though a plain `python -c "import opendssdirect"` works fine there. Skip
+# before even attempting the import on that platform.
+# See https://github.com/dss-extensions/OpenDSSDirect.py/issues/148
+if sys.platform.startswith("win"):
+    pytest.skip(
+        "OpenDSSDirect.py crashes the pytest process on Windows, see "
+        "https://github.com/dss-extensions/OpenDSSDirect.py/issues/148",
+        allow_module_level=True,
+    )
+
 # OpenDSSDirect.py is an optional dependency; skip the whole module without it.
 pytest.importorskip("opendssdirect")
 

pyproject.toml

@@ -106,7 +106,7 @@ typing = [
 ]
 
 #all = ["pandapower[plotting,performance,fileio,converter,pgm,control,helm,opendss]"]
-all = ["pandapower[plotting,performance,fileio,converter,pgm,control]"]
+all = ["pandapower[plotting,performance,fileio,converter,pgm,control,opendss]"]
 dev = ["pandapower[all,docs,test,typing,pandamodels,tutorials]"]
 # "shapely", "pyproj", "Pyogrio" are dependencies of geopandas and should be already available ("Fiona" got dropped)
 # "hashlib", "zlib", "base64" produce install problems, so they are not included