ENH: Ingest ITKIOMeshSTL into Modules/IO

Modules/IO/IOMeshSTL/CMakeLists.txt

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+project(IOMeshSTL)
+set(IOMeshSTL_LIBRARIES IOMeshSTL)
+
+itk_module_impl()

Modules/IO/IOMeshSTL/LICENSE

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Modules/IO/IOMeshSTL/README.md

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+# IOMeshSTL
+
+In-tree ITK module providing read/write support for the
+stereolithography (STL) mesh format, in both ASCII and binary
+encodings. STL is the canonical interchange format for 3D-printing,
+CAD, and surgical-planning workflows.
+
+The flagship classes are `itk::STLMeshIO` and the `STLMeshIOFactory`
+plug-in registration that lets `itk::MeshFileReader` /
+`itk::MeshFileWriter` discover STL automatically.
+
+## Origin
+
+Ingested from the standalone remote module
+[**InsightSoftwareConsortium/ITKIOMeshSTL**](https://github.com/InsightSoftwareConsortium/ITKIOMeshSTL)
+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+reachable at the URL above for historical reference.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
+
+- Mueller D. *STL file format reader and writer for ITK.* The Insight Journal. 2014. <https://doi.org/10.54294/jdvcg7>