Add headless recording renderer api

docs/modernization/build-inventory.md

@@ -241,6 +241,9 @@ 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
+  command order, records render commands, and records trace markers without a
+  window or GL context.
 - `pp_ui_core` consumes vcpkg tinyxml2 only when `PP_USE_VCPKG_TINYXML2=ON`
   through the vcpkg preset; default and Android validation still use the
   retained vendored fallback tracked by DEBT-0012.