feat(node_assets): add image plane geometry nodes and validation scripts

- Implemented `image_plane.py` to build the Image Plane Geometry Nodes group with customizable parameters for geometry, subdivide, and thickness.
- Created `image_plane_validation.py` to validate the functionality of the image plane, ensuring correct geometry generation and material assignment.
- Developed `material_layers.py` to construct shader node groups for image materials, including depth and normal handling.
- Authored `plane_layouts.py` to define node arrangements for image geometry assets.
- Introduced `shadeless.py` to create a shadeless shader node group that displays color without scene lighting while preserving shadows and reflections.

tests/test_cutout_interaction.py

@@ -1,14 +1,13 @@
 import json
 import sys
 from pathlib import Path
-from types import MethodType, SimpleNamespace
+from types import SimpleNamespace
 
 SOURCE_ROOT = Path(__file__).parents[1] / "src"
 sys.path.insert(0, str(SOURCE_ROOT))
 
 from anyimage.common.selection import SelectionPath
 from anyimage.common import viewport
-from anyimage.common.viewport import ImageGesture
 from anyimage.operators.cutout_tool import interaction
 from anyimage.operators.cutout_tool import main as cutout_main
 
@@ -173,69 +172,27 @@ def test_cutout_mesh_detail_maps_to_denser_sampling():
     ] == [32, 16, 8, 4]
 
 
-def test_cutout_reuses_image_lasso_gesture_and_double_click_selects_all(monkeypatch):
-    source = cutout_source(size=(65536, 32768))
+def test_cutout_lasso_submission_passes_only_the_selected_path(monkeypatch):
+    source = cutout_source()
     window_manager = WindowManager()
     context = cutout_context(window_manager)
-
-    monkeypatch.setattr(
-        cutout_main, "resolve_image_edit_click", lambda *_args: (source, True)
-    )
-    monkeypatch.setattr(cutout_main, "video_total_frames", lambda _image: 1)
     monkeypatch.setattr(cutout_main, "require_image_empty", lambda _name: source)
-    monkeypatch.setattr(cutout_main, "serialize_matrix", lambda _matrix: "matrix")
-    monkeypatch.setattr(
-        cutout_main,
-        "image_rgba",
-        lambda *_args: (_ for _ in ()).throw(AssertionError("unexpected pixel read")),
-    )
-    monkeypatch.setattr(
-        cutout_main,
-        "rasterize_selection_path",
-        lambda *_args, **_kwargs: (_ for _ in ()).throw(
-            AssertionError("unexpected Selection rasterization")
-        ),
-    )
-
-    operator = SimpleNamespace(
-        full_image=True,
-        report=lambda *_args: None,
-    )
-    source.matrix_world = object()
-    operator._submit_selection_path = MethodType(
-        cutout_main.SelectCutoutSelection._submit_selection_path,
-        operator,
-    )
-    result = cutout_main.SelectCutoutSelection.invoke(
-        operator, context, SimpleNamespace(value="DOUBLE_CLICK")
-    )
-
-    assert issubclass(cutout_main.SelectCutoutSelection, ImageGesture)
+    monkeypatch.setattr(interaction, "ai_ready", lambda: False)
+    path = SelectionPath(points=((0, 0), (10, 0), (0, 10)))
+    operator = SimpleNamespace(source_object_name=source.name, _pie_event=object())
+    result = cutout_main.SelectCutoutSelection._submit_selection_path(operator, context, path)
     assert result == {"FINISHED"}
-    selection_path = SelectionPath.from_json(window_manager.pie.calls[0][2].selection_path_json)
-    assert selection_path.points == (
-        (0, 0),
-        (65536, 0),
-        (65536, 32768),
-        (0, 32768),
-    )
-    assert window_manager.pie.calls[0][2].point_spacing == 32
-    assert not hasattr(cutout_main, "pending_selection")
+    assert SelectionPath.from_json(window_manager.pie.calls[0][2].selection_path_json) == path
 
 
-def test_cutout_tool_prioritizes_double_click_before_lasso_drag():
-    assert cutout_main.CutoutTool.bl_keymap[0][1]["value"] == "DOUBLE_CLICK"
-    assert cutout_main.CutoutTool.bl_keymap[1][1]["value"] == "CLICK_DRAG"
-    assert [entry[0] for entry in cutout_main.CutoutTool.bl_keymap[2:]] == [
-        "view3d.select",
-        "view3d.select",
-    ]
-    assert cutout_main.CutoutTool.bl_keymap[2][2] == {
-        "properties": [("deselect_all", False)]
-    }
-    assert cutout_main.CutoutTool.bl_keymap[3][2] == {
-        "properties": [("toggle", True)]
-    }
+def test_cutout_tool_only_binds_lasso_drag_and_native_selection():
+    keymap = cutout_main.CutoutTool.bl_keymap
+    assert keymap[0][1]["value"] == "CLICK_DRAG"
+    assert [entry[0] for entry in keymap[1:]] == ["view3d.select", "view3d.select"]
+    assert all(entry[1]["value"] != "DOUBLE_CLICK" for entry in keymap)
+    assert "full_image" not in cutout_main.SelectCutoutSelection.__annotations__
+    assert keymap[1][2] == {"properties": [("deselect_all", False)]}
+    assert keymap[2][2] == {"properties": [("toggle", True)]}
 
 
 def test_cutout_f_has_no_option_shortcut(monkeypatch):