Add comprehensive tests for image processing nodes and refactor node imports

- Introduced new test files for image layer, image plane, normal scale, object normal rotation, shadeless, and temporary attributes.
- Implemented tests to validate the behavior of alpha curves, depth layers, and normal scales in various rendering engines.
- Refactored import paths for node groups to align with the new directory structure.
- Added checks for temporary attribute lifetimes and ensured proper cleanup without warnings.
- Enhanced CLI commands to require the Blender group and validate the presence of generated node assets before packaging.
- Updated packaging scripts to enforce the existence of necessary assets, preventing build failures.

tests/support/materials.py

@@ -1,6 +1,6 @@
 import bpy
 import pytest
-from tools.nodes.groups.image_layer import build_image_layer_group
+from nodes.groups.image_layer import build_image_layer_group
 
 
 @pytest.fixture

tests/support/nodes.py

@@ -1,7 +1,7 @@
 """Shared assertions and asset selection for node tests."""
-from tools.nodes.groups.image_cutout import build_image_cutout_group
-from tools.nodes.groups.image_depth_cutout import build_image_depth_cutout_group
-from tools.nodes.groups.image_cutout_symmetry import build_image_cutout_symmetry_group
+from nodes.groups.image_cutout import build_image_cutout_group
+from nodes.groups.image_depth_cutout import build_image_depth_cutout_group
+from nodes.groups.image_cutout_symmetry import build_image_cutout_symmetry_group
 
 CUTOUT_BUILDERS = {
     "FLAT": build_image_cutout_group,

tests/support/planes.py

@@ -4,9 +4,9 @@ import bpy
 import numpy as np
 import pytest
 
-from tools.nodes.groups.image_plane import build_image_plane_group
-from tools.nodes.groups.image_depth_plane import build_image_depth_plane_group
-from tools.nodes.groups.image_relief_plane import build_image_relief_plane_group
+from nodes.groups.image_plane import build_image_plane_group
+from nodes.groups.image_depth_plane import build_image_depth_plane_group
+from nodes.groups.image_relief_plane import build_image_relief_plane_group
 
 
 @pytest.fixture