ENH: Ingest ITKRLEImage into Modules/Filtering

Modules/Filtering/RLEImage/CMakeLists.txt

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+project(RLEImage)
+
+if(POLICY CMP0135)
+  cmake_policy(SET CMP0135 NEW)
+endif()
+
+itk_module_impl()

Modules/Filtering/RLEImage/LICENSE

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Modules/Filtering/RLEImage/README.md

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+# RLEImage
+
+In-tree ITK module providing a run-length-encoded image type for
+memory-efficient storage of large label volumes (segmentation masks).
+The flagship class `itk::RLEImage<TPixel, VImageDimension, CounterType>`
+is a drop-in replacement for `itk::Image` in many label-image
+workflows, with iterators and filters that operate directly on the
+encoded representation.
+
+## Origin
+
+Ingested from the standalone remote module
+[**KitwareMedical/ITKRLEImage**](https://github.com/KitwareMedical/ITKRLEImage)
+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+reachable at the URL above for historical reference.
+
+## Companion module
+
+`itk::MorphologicalContourInterpolation` (in
+`Modules/Filtering/MorphologicalContourInterpolation/`) has an
+optional `TEST_DEPENDS` on this module — the
+`itkMorphologicalContourInterpolationTestWithRLEImage` test
+exercises that integration.
+
+## References
+
+- Zukić D., Vicory J., McCormick M., Wisse L., Gerig G., Yushkevich P.,
+  Aylward S. *ND morphological contour interpolation.* The Insight
+  Journal. 2016. <https://doi.org/10.54294/achtrg>