Route shader runtime calls through renderer GL

docs/modernization/build-inventory.md

@@ -227,7 +227,10 @@ Known local toolchain state:
   `Shader` no longer spells GL enum
   names directly. It also owns the PanoPainter shader uniform catalog and legacy hash
   mapping used by `Shader` active-uniform discovery and the uniform uniqueness
-  check. App OpenGL initialization debug severity, debug output, GL info string,
+  check. Legacy `Shader` program use/delete, uniform writes, and
+  attribute-location lookup now consume tested dispatch contracts here;
+  compile/link and active-uniform discovery are still retained legacy GL calls.
+  App OpenGL initialization debug severity, debug output, GL info string,
   renderer API viewport/scissor rect conversion, default depth/program-point/
   line-smooth state, blend factor/equation, and UI render-target RGBA8 format
   tokens are cataloged and tested here too, including the legacy convert command

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,