Refactor depth reference handling and cleanup

- Unified reference depth calculation to use a single implementation in common/depth.py.
- Removed server-side reference depth computation and adjusted depth.json to only include image_size and intrinsics.
- Updated depth texture handling to ignore transparent, invalid, and non-positive pixels when calculating reference depth.
- Changed reference depth calculation to use the 95th percentile of valid depth values.
- Adjusted depth direction fitting to return a flat direction when no samples are available.
- Removed cleanup threshold parameters from Cutout and related nodes, simplifying the interface.
- Updated tests to verify new reference depth logic and ensure compatibility with existing functionality.

tests/anyimage/operators/test_cutout_geometry.py

@@ -115,6 +115,16 @@ def test_depth_surface_cutout_uses_default_alpha_boundary():
     np.testing.assert_allclose(contour.max(axis=0), (11.0, 8.0))
 
 
+def test_cutout_reference_mask_resamples_content_to_depth_resolution():
+    content = np.zeros((4, 4), dtype=np.float32)
+    content[:, 2:] = 1.0
+
+    mask = cutout_geometry.build_reference_mask(content, (2, 2))
+
+    assert mask.dtype == np.bool_
+    np.testing.assert_array_equal(mask, ((False, True), (False, True)))
+
+
 def test_blender_cutout_alpha_pipeline_does_not_import_pillow():
     original_import = builtins.__import__
 
@@ -154,23 +164,6 @@ def test_blender_cutout_contour_resolution_tracks_sampling_resolution():
     assert trace.call_args_list[1].kwargs["max_resolution"] == 1024
 
 
-def test_cutout_cleanup_value_scales_the_ui_without_changing_node_area():
-    assert np.isclose(
-        cutout_geometry.cutout_cleanup_value(
-            0.25,
-            ((1.0, 0.0), (0.0, 1.0)),
-        ),
-        6.25,
-    )
-    assert np.isclose(
-        cutout_geometry.cutout_cleanup_value(
-            0.25,
-            ((4.0, 0.0), (0.0, 9.0)),
-        ),
-        6.25 / 6.0,
-    )
-
-
 def test_cutout_domain_adapts_boundary_spacing_for_a_small_valid_selection():
     components = ((((2046, 2046), (2050, 2046), (2050, 2050), (2046, 2050)),),)