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