ENH: Migrate RLEImage content to ITK main; archive this repo

Author: hjmjohnson

CMakeLists.txt

@@ -1,5 +1,19 @@
 # Migrated to ITK main
 
+The `RLEImage` module has been ingested into the Insight Toolkit (ITK) main repository and is no longer maintained here.
+
+- **In-tree location:** [`Modules/Filtering/RLEImage`](https://github.com/InsightSoftwareConsortium/ITK/tree/main/Modules/Filtering/RLEImage)
+- **Ingest PR:** [InsightSoftwareConsortium/ITK#6208](https://github.com/InsightSoftwareConsortium/ITK/pull/6208)
+- **Merge commit:** [`11c2f38b0d`](https://github.com/InsightSoftwareConsortium/ITK/commit/11c2f38b0db3b5a4b22f83ddcddff7358d19a0bc)
+
+Future development, bug fixes, and pull requests should target ITK main. This repository's history is preserved for `git blame` and archival reference.
+
+**Maintainer action:** please mark this repository **Archived** under repo Settings -> Danger Zone after merging this PR. See the [ITK ingestion strategy](https://github.com/InsightSoftwareConsortium/ITK/blob/main/Utilities/Maintenance/RemoteModuleIngest/INGESTION_STRATEGY.md) for context.
+
+---
+
+# Migrated to ITK main
+
 As of 2026-05-05, the `RLEImage` module has been ingested into the
 main ITK repository at
 [`Modules/Filtering/RLEImage`](https://github.com/InsightSoftwareConsortium/ITK/tree/main/Modules/Filtering/RLEImage)