Extract OpenGL shader uniform catalog

docs/modernization/roadmap.md

@@ -395,8 +395,10 @@ format mapping for `Texture2D` image uploads and framebuffer status naming for
 extension, upload-format, framebuffer diagnostic, and mesh draw-mode
 interpretation to that backend library. The PanoPainter shader attribute
 binding catalog also lives in `pp_renderer_gl` and is consumed by legacy
-`Shader` creation. The existing renderer classes are not yet fully behind the
-renderer interfaces.
+`Shader` creation. Shader uniform hashing, catalog validation, active-uniform
+mapping, and the legacy uniform uniqueness check now delegate to
+`pp_renderer_gl` as well. The existing renderer classes are not yet fully
+behind the renderer interfaces.
 
 Implementation tasks:
 
@@ -641,7 +643,9 @@ Results:
   mode mapping. Shader attribute binding catalog validation covers the current
   `pos`, `uvs`, `uvs2`, `col`, and `nor` bindings and rejects empty, unnamed,
   null-name, and duplicate-name catalogs while preserving legacy shared
-  locations.
+  locations. Shader 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.
 - PowerShell analyze automation returns JSON summaries and includes the shader
   validation target.
 - `windows-msvc-vcpkg-headless` configured through the Visual Studio bundled