Add renderer backend feature reporting

docs/modernization/roadmap.md

@@ -414,7 +414,7 @@ Goal: make OpenGL an implementation detail and establish parity tests before
 adding new backends.
 
 Status: started. `pp_renderer_api` exists as a headless renderer-neutral target
-with explicit texture usage flags, texture descriptor, byte-size, viewport,
+with renderer feature flags, explicit texture usage flags, texture descriptor, byte-size, viewport,
 mesh, readback bounds, command context, render device, shader program
 descriptor, mesh, render target, readback byte-size helpers,
 texture mip-level validation, resource debug-label validation,
@@ -830,7 +830,7 @@ Results:
   reintroduces raw `GL_*`/`WGL_*` constants outside the allowed legacy OpenGL
   implementation files.
 - `pp_renderer_api` now includes a headless `RecordingRenderDevice` with strict
-  renderer-owned resource factory and
+  renderer feature flags, renderer-owned resource factory and
   command-order/render-pass-clear/scissor-state/depth-state/blend-state/
   texture-usage/texture-bind/sampler-bind/shader-uniform/texture-upload/
   mipmap-generation/texture-transition/readback/frame-capture/blit validation plus explicit draw
@@ -843,7 +843,7 @@ Results:
   and render-target blits, giving automation a backend-neutral render path that
   does not require a window or GL context.
 - `pano_cli record-render` exercises that headless recording renderer and emits
-  JSON command counts, resource creation counts, target dimensions, backend
+  JSON command counts, backend feature flags, resource creation counts, target dimensions, backend
   name, trace marker/scope and draw summary, labeled descriptor counts,
   render-pass/depth-clear counts, and draw
   descriptor vertex/index totals, scissor/depth/blend-state plus