Move NodeCanvas GL mappings to renderer gl

docs/modernization/roadmap.md

@@ -749,6 +749,10 @@ Results:
 - Canvas mode overlay, mask, and transform paths now route generic OpenGL
   blend/depth state, active texture units, 2D copy targets, and RGBA8
   readback formats through the renderer GL backend mapping.
+- `NodeCanvas` panorama UI rendering now routes sampler defaults, saved
+  viewport/clear/blend/depth/scissor state, color clears, active texture units,
+  fallback 2D texture unbinds, copy targets, and RGBA8 render-target formats
+  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.