Add headless recording renderer api

docs/modernization/roadmap.md

@@ -740,6 +740,9 @@ Results:
 - Renderer-boundary automation fails if active non-backend source code
   reintroduces raw `GL_*`/`WGL_*` constants outside the allowed legacy OpenGL
   implementation files.
+- `pp_renderer_api` now includes a headless `RecordingRenderDevice` with strict
+  command-order validation and command/trace capture, giving automation a
+  backend-neutral render path that does not require a window or GL context.
 - PowerShell package-smoke wrapper validates the Windows CMake app executable
   and runtime `data/` copy.
 - Android arm64 configured with NDK 29.0.14206865 through the platform-build