Route shader runtime calls through renderer GL

docs/modernization/roadmap.md

@@ -1119,6 +1119,10 @@ Results:
   uniform catalog validation covers the 43 legacy uniform
   names used by `Shader`, preserves the legacy hash ids, and rejects empty,
   unnamed, null-name, mismatched-hash, and duplicate-name catalogs.
+  Legacy `Shader` program use/delete, uniform writes, and attribute-location
+  lookups now execute through tested `pp_renderer_gl` dispatch contracts;
+  shader compile/link and active-uniform discovery remain the next shader
+  boundary work.
 - `pp_renderer_gl_command_plan_tests` covers the headless OpenGL command
   planner for recorded render-pass clear masks/values, viewport/scissor state,
   blend/depth/sampler state, texture format mapping, mesh/draw primitive modes,