Add renderer backend feature reporting

docs/modernization/build-inventory.md

@@ -284,8 +284,9 @@ Known local toolchain state:
   renderer-boundary guard that reports JSON and fails if active non-backend
   source code reintroduces raw `GL_*`/`WGL_*` constants outside the allowed
   legacy OpenGL implementation files.
-- `pp_renderer_api` exposes a headless `RecordingRenderDevice` that validates
-  backend-owned resource creation, explicit texture usage flags, command order,
+- `pp_renderer_api` exposes a headless `RecordingRenderDevice` that reports
+  renderer feature flags and validates backend-owned resource creation,
+  explicit texture usage flags, command order,
   render-pass color/depth/stencil clear intent, scissor state, depth state,
   blend state, texture-slot binding, sampler-state binding, texture-upload byte
   counts, texture mip-level counts, resource debug labels, mipmap-generation commands,
@@ -297,7 +298,7 @@ Known local toolchain state:
   frame-capture/blit commands, draw mesh inputs, explicit draw ranges, and
   records trace markers and scopes without a window or GL context.
 - `pano_cli record-render` exposes the recording renderer through JSON
-  automation, including render-pass/depth-clear counts, scissor/depth/blend/
+  automation, including backend feature flags, render-pass/depth-clear counts, scissor/depth/blend/
   shader-uniform/texture-bind/sampler-bind/upload/mipmap-generation/texture-transition/texture-copy/readback/
   frame-capture/blit command and byte totals, trace marker/scope counts,
   labeled descriptor counts, backend resource creation counts, plus draw