ENH: Ingest ITKCuberille into Modules/Filtering

Modules/Filtering/Cuberille/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16.3)
+project(Cuberille)
+
+if(NOT ITK_SOURCE_DIR)
+  find_package(ITK 4.10 REQUIRED)
+  list(APPEND CMAKE_MODULE_PATH ${ITK_CMAKE_DIR})
+  include(ITKModuleExternal)
+else()
+  itk_module_impl()
+endif()

Modules/Filtering/Cuberille/LICENSE

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Modules/Filtering/Cuberille/README.md

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+# Cuberille
+
+In-tree ITK module providing the cuberille implicit-surface
+extraction algorithm: given a binary or scalar volume and an
+iso-value, produce a quad mesh approximating the iso-surface, with
+optional vertex normal interpolation and project-to-iso-surface
+refinement.
+
+The flagship class is `itk::CuberilleImageToMeshFilter`.
+
+## Origin
+
+Ingested from the standalone remote module
+[**InsightSoftwareConsortium/ITKCuberille**](https://github.com/InsightSoftwareConsortium/ITKCuberille)
+on 2026-05-04 via the v4 ingestion pipeline. The upstream repository
+will be archived read-only after this PR merges; it remains
+reachable at the URL above for historical reference.
+
+## References
+
+- Herman G.T., Liu H.K. *Three-dimensional display of human organs from computed tomograms.* Computer Graphics and Image Processing. 1979.
+- Mueller D. *Cuberille implicit surface polygonization for ITK.* The Insight Journal. 2010. <https://doi.org/10.54294/p6m37k>