Move NodeCanvas GL mappings to renderer gl

docs/modernization/build-inventory.md

@@ -205,6 +205,10 @@ Known local toolchain state:
   Canvas mode overlay, mask, and transform paths also consume backend-owned
   blend/depth state, active texture units, 2D texture copy targets, and RGBA8
   readback format tokens.
+  `NodeCanvas` panorama UI rendering also consumes backend-owned sampler
+  defaults, viewport/clear-state queries, blend/depth/scissor state, color
+  clear masks, active texture units, fallback 2D texture unbind targets, copy
+  targets, and RGBA8 render-target formats.
 - `windows-msvc-vcpkg-headless` validates manifest install/configure/build/test
   for the current headless component matrix; see DEBT-0007 for remaining app
   and platform triplet migration.

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.