Move canvas stroke commit GL mappings to renderer gl

docs/modernization/roadmap.md

@@ -762,6 +762,9 @@ Results:
   and blend state, saved viewport/clear-state queries, active texture units,
   fallback 2D texture unbinds, and stroke background copy targets through the
   renderer GL backend mapping.
+- Canvas stroke commit now routes saved viewport/clear/blend state, history
+  readbacks, active texture units, fallback 2D texture unbinds, and layer
+  compositing copy targets through the renderer GL backend mapping.
 - Known remaining warnings: legacy project/vendor diagnostics, Visual Studio
   vcpkg-manifest warning, `LNK4099` missing libyuv PDBs, and `LNK4098` runtime
   library conflict from retained vendor binaries.