Fix pylint import order in tests for any checkout directory name

pylint only classifies node_runner as a first-party import when the
checkout directory happens to be named "node_runner". CI checks out into
a directory named after the repository, so node_runner was treated as
third party while tests.helpers was first party, and every test that
imported both was reported as C0411 wrong-import-order.

Importing node_runner before tests.helpers satisfies the rule under both
layouts: third-party-before-first-party when the folder name differs, and
same-group when it matches.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YZzPV4TzpvkQroARk4K4Hg

Author: tonis2

tests/test_deserialize.py

@@ -2,8 +2,6 @@
 
 from unittest.mock import MagicMock
 
-from tests.helpers import MockNodeTree, MockSocket
-
 from node_runner.deserialize import (
     get_node_socket_base_type,
     get_socket_by_identifier,
@@ -12,6 +10,8 @@
     deserialize_node_tree,
 )
 
+from tests.helpers import MockNodeTree, MockSocket
+
 
 class TestGetNodeSocketBaseType:
     """Test socket type resolution."""

tests/test_geometry_nodes.py

@@ -6,8 +6,6 @@
 
 from unittest.mock import MagicMock
 
-from tests.helpers import MockNode, MockNodeTree
-
 from node_runner.serialize import serialize_node_tree
 from node_runner.encoding import (
     encode,
@@ -20,6 +18,8 @@
     decode_xml,
 )
 
+from tests.helpers import MockNode, MockNodeTree
+
 
 class TestSerializeGeometryTree:
     """Geometry node trees should serialize with tree_type set."""

tests/test_serialize.py

@@ -4,8 +4,6 @@
 
 from mathutils import Color, Euler, Vector
 
-from tests.helpers import MockNode, MockNodeTree, MockRNAProperty
-
 from node_runner.serialize import (
     serialize_color,
     serialize_vector,
@@ -16,6 +14,8 @@
     serialize_node_tree,
 )
 
+from tests.helpers import MockNode, MockNodeTree, MockRNAProperty
+
 
 class TestPrimitiveSerializers:
     """Test basic type serializers."""