Add cutout shell and volume node assets for depth volume processing

- Implemented `cutout_shell.py` to build front normals and shell positions for balloon geometry.
- Created `cutout_volume.py` to establish smooth center fields and manage balloon surface attributes.
- Introduced `pisa_sr_export.py` for exporting PiSA-SR components with dependencies and asset finalization.

src/anyimage/operators/upscale.py

@@ -29,7 +29,7 @@ from ..common.image import (
 
 _HIDDEN = {"HIDDEN", "SKIP_SAVE"}
 
-UPSCALE_FACTOR = 4
+UPSCALE_FACTOR = 2
 
 
 def upscale_output_size(image):
@@ -49,7 +49,7 @@ def upscale_input_size_allowed(image, max_input_size):
 class UpscaleImage(JobOperatorBase, bpy.types.Operator):
     bl_idname = "anyimage.upscale_image"
     bl_label = "Upscale"
-    bl_description = "Upscale this Image Empty by 4x with an AI model"
+    bl_description = "Upscale this Image Empty by 2x with an AI model"
     bl_options = {"UNDO"}
     job_type = "upscale-image"
     starting_message = "Starting Image Empty upscale"