Share retained sampler and pixel-buffer dispatch bridges

docs/modernization/roadmap.md

@@ -1145,7 +1145,11 @@ face targets, RGBA allocation format, and unsigned-byte component type also
 delegate to `pp_renderer_gl`. RGBA8/RGBA32F readback formats, checked byte-count math, PBO
 pixel-buffer target/usage/access tokens, and PBO allocation/readback/map/unmap/delete
 dispatch sequences used by retained recording readbacks now live in
-`pp_renderer_gl`. The framebuffer blit color mask and linear/nearest
+`pp_renderer_gl`; retained `PBO` allocation, framebuffer readback, map, unmap,
+and delete dispatch now share the retained `legacy_gl_pixel_buffer_dispatch`
+raw callback bridge. Retained `Sampler` create, parameter, border-color, bind,
+and unbind dispatch now share the retained `legacy_gl_sampler_dispatch` raw
+callback bridge. The framebuffer blit color mask and linear/nearest
 filter tokens used by `RTT::resize` and `RTT::copy`, renderer API blit-filter
 to OpenGL token mapping, plus the default
 render-target texture parameters and parameter dispatch, texture/renderbuffer
@@ -2563,6 +2567,12 @@ Results:
   `legacy_gl_framebuffer_dispatch`, removing duplicated raw framebuffer and
   readback callbacks from `src/texture.cpp` and `src/rtt.cpp` while
   framebuffer/readback ownership remains retained under DEBT-0036.
+- Retained `Sampler` create, parameter, border-color, bind, and unbind dispatch
+  now share `legacy_gl_sampler_dispatch`, and retained `PBO` allocation,
+  framebuffer readback, map, unmap, and delete dispatch now share
+  `legacy_gl_pixel_buffer_dispatch`; this removes another pair of raw resource
+  callback clusters from `src/texture.cpp` and `src/rtt.cpp` while sampler and
+  pixel-buffer ownership remain retained under DEBT-0036.
 - Canvas draw-merge shader-blend selection now consumes the extracted
   `pp_paint_renderer` stroke composite planner for current layer and primary
   brush blend modes, while preserving legacy OpenGL compositing execution under