Route default clear through renderer GL

docs/modernization/build-inventory.md

@@ -461,9 +461,9 @@ Known local toolchain state:
   `src/platform_legacy/legacy_platform_services.*`.
 - `pp_renderer_gl` owns the tested `OpenGlInitialState` startup depth/blend
   policy and dispatch application consumed by `App::init`, tested runtime
-  version/vendor/renderer/GLSL string query dispatch, plus renderer API to
-  OpenGL token mapping and command-planning contracts used by the OpenGL parity
-  work.
+  version/vendor/renderer/GLSL string query dispatch, tested default clear
+  color/buffer dispatch consumed by `App::clear`, 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

@@ -521,6 +521,9 @@ operation order.
 OpenGL runtime version/vendor/renderer/GLSL string queries now also use a
 tested `pp_renderer_gl` dispatch contract, leaving `App::init` to log the
 result while the backend owns the query set and order.
+The default app clear color and color-buffer clear operation now dispatch
+through `pp_renderer_gl` as well, moving another direct OpenGL operation out
+of `App::clear` while preserving the current gray clear behavior.
 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.