Route cube textures and samplers through renderer GL

docs/modernization/roadmap.md

@@ -1109,6 +1109,10 @@ Results:
   Sampler parameter validation covers wrap S/T/R plus min/mag filter ordering
   used by legacy `Sampler::set` and `Sampler::set_filter`, plus the desktop
   border-color parameter name used by `Sampler::set_border`.
+  Legacy `TextureCube` allocation/bind/delete and `Sampler`
+  create/configure/border/bind/unbind paths now execute through tested
+  `pp_renderer_gl` dispatch contracts, keeping cube-map and sampler resource
+  lifecycle reachable without a live GL context.
   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. Shader