Add tests for image layer, image plane, inventory, saved layout, commands, documentation, manifest, and packaging

- Implement tests for image layer functionality including alpha curve and depth layer behavior.
- Create tests for image plane evaluation and modifier input handling.
- Add tests to verify the saved asset inventory and its persistence.
- Introduce tests for the documentation command to ensure correct project version deployment.
- Validate the extension manifest structure and required permissions.
- Develop tests for the packaging process, ensuring correct platform handling and dependency management.
- Enhance image depth plane group functionality with new split threshold input and surface processing.

tests/tools/nodes/test_saved_layout.py

@@ -0,0 +1,37 @@
+from tests.support.paths import PROJECT_ROOT
+import unittest
+
+
+SOURCE_ROOT = PROJECT_ROOT / "src" / "anyimage"
+
+
+class NodeAssetsTest(unittest.TestCase):
+    def test_geometry_assets_preserve_node_structure(self):
+        import bpy
+
+        from tests.support.nodes import validate_node_structure
+        from tools.nodes.arrangement.arrange import arrange_nodes
+
+        bpy.ops.wm.read_factory_settings(use_empty=True)
+        with bpy.data.libraries.load(
+            str(SOURCE_ROOT / "assets" / "O_AnyImage.blend")
+        ) as (source, target):
+            target.node_groups = list(source.node_groups)
+        groups = [
+            group
+            for group in target.node_groups
+            if group.bl_idname == "GeometryNodeTree"
+        ]
+        self.assertEqual(len(groups), 6)
+        for group in groups:
+            validate_node_structure(group)
+            positions = {node.name: tuple(node.location) for node in group.nodes
+                         if node.bl_idname not in {"NodeReroute", "NodeGroupInput"}}
+            arrange_nodes(group)
+            for name, position in positions.items():
+                for actual, expected in zip(group.nodes[name].location, position):
+                    self.assertAlmostEqual(actual, expected, delta=0.01, msg=f"{group.name}: {name}")
+
+
+if __name__ == "__main__":
+    unittest.main()