Route GL state snapshot through renderer GL

docs/modernization/build-inventory.md

@@ -465,8 +465,9 @@ Known local toolchain state:
   color/buffer dispatch consumed by `App::clear`, tested app UI
   viewport/scissor dispatch consumed by `App::draw` and `App::vr_draw_ui`,
   tested generic capability/buffer-clear dispatch consumed by VR draw state
-  setup, plus renderer API to OpenGL token mapping and command-planning
-  contracts used by the OpenGL parity work.
+  setup, tested saved-state snapshot/restore dispatch consumed by the retained
+  `gl_state` utility, plus renderer API to OpenGL token mapping and
+  command-planning contracts used by the OpenGL parity work.
 - `pano_cli plan-cloud-upload` exposes `pp_app_core` cloud upload availability,
   new-document warning, publish prompt, and save-before-upload planning as JSON;
   the live cloud upload command consumes the same start contract before

docs/modernization/roadmap.md

@@ -535,6 +535,11 @@ VR draw blend/depth state transitions and depth-buffer clears now use generic
 tested `pp_renderer_gl` capability and clear dispatch contracts, reducing
 direct OpenGL execution in the retained VR app path without changing state
 restore behavior.
+The retained `gl_state` save/restore utility now snapshots and restores through
+tested `pp_renderer_gl` saved-state dispatch contracts, covering capability
+state, viewport, clear color, framebuffer/program bindings, active texture,
+2D texture slots, samplers, and cube-map binding without changing the legacy
+utility's public fields.
 Windows RenderDoc frame capture hooks now also dispatch through
 `PlatformServices`, keeping capture integration in the platform service while
 leaving non-Windows adapters as no-ops.