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/test_commands.py

@@ -0,0 +1,23 @@
+from tests.support.paths import PROJECT_ROOT
+import tomllib
+import unittest
+
+
+class ToolCommandsTests(unittest.TestCase):
+    def test_repository_tools_have_uv_commands(self):
+        project = tomllib.loads(
+            (PROJECT_ROOT / "pyproject.toml").read_text(encoding="utf-8")
+        )["project"]
+        self.assertEqual(
+            project["scripts"],
+            {
+                "pack": "tools.pack:main",
+                "build_nodes": "tools.nodes.cli:main",
+                "sync_models": "tools.models.cli:main",
+                "docs": "tools.docs:main",
+            },
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()