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/tools/test_environments.py

@@ -1,3 +1,4 @@
+import subprocess
 import tomllib
 
 from tests.support.paths import PROJECT_ROOT
@@ -43,14 +44,38 @@ def test_ai_and_model_groups_own_their_runtime_dependencies():
 
 
 def test_workflows_run_the_regular_blender_suite():
-    command = "uv run --group blender pytest tests/anyimage tests/tools"
+    build_command = "uv run --group blender node-group build --skip-tests"
+    test_command = (
+        "uv run --group blender pytest tests/anyimage tests/nodes tests/tools"
+    )
     for name in ("test.yml", "release.yml"):
         workflow = (PROJECT_ROOT / ".github" / "workflows" / name).read_text(
             encoding="utf-8"
         )
-        assert command in workflow
+        assert build_command in workflow
+        assert test_command in workflow
+        assert workflow.index(build_command) < workflow.index(test_command)
+        assert "BLENDER_BIN" not in workflow
+        assert "download" not in workflow.lower()
 
     release = (PROJECT_ROOT / ".github" / "workflows" / "release.yml").read_text(
         encoding="utf-8"
     )
     assert "uv run pack" in release
+
+
+def test_generated_node_asset_is_ignored_and_untracked():
+    asset = "src/anyimage/assets/O_AnyImage.blend"
+    ignored = subprocess.run(
+        ["git", "check-ignore", "--quiet", asset],
+        cwd=PROJECT_ROOT,
+        check=False,
+    )
+    tracked = subprocess.run(
+        ["git", "ls-files", "--error-unmatch", asset],
+        cwd=PROJECT_ROOT,
+        check=False,
+        capture_output=True,
+    )
+    assert ignored.returncode == 0
+    assert tracked.returncode != 0