Refactor stereo frame worker and interpolation tests for enhanced VR performance

- Updated stereo_frame_worker_smoke.cpp to allow dynamic headset rates and prediction lead time.
- Improved logging to include motion diagnostics and adjusted frame submission logic based on headset frequency.
- Enhanced stereo_interpolation_test.cpp with additional tests for camera motion separation and playback cadence.
- Introduced MkwVRReadSceneView function to read the camera view matrix for improved scene rendering.
- Modified VR first-person logic to support scene view reading and validation.
- Added scene_camera.hpp to encapsulate camera motion handling and inverse view calculations.
- Ensured that the VR integration layer correctly logs motion diagnostics and handles scene playback accurately.

runtime/src/vr/mkw_vr_first_person.cpp

@@ -1422,6 +1422,10 @@ void MkwVRFirstPersonRecenter() noexcept {
     g_recenter_requested.store(true, std::memory_order_release);
 }
 
+bool MkwVRReadSceneView(Mtx34& view) noexcept {
+    return ReadSceneViewMatrix(view);
+}
+
 void MkwVRFirstPersonUpdate(uint64_t guest_frame_index, uint32_t race_camera_address) noexcept {
     std::lock_guard lock(g_mutex);
     g_state.held_item = {};

runtime/src/vr/openxr_integration.cpp

@@ -893,6 +893,7 @@ private:
             }
 
             const MkwVRPolicySnapshot policy = MkwVRPolicyGetSnapshot();
+            aurora_set_stereo_motion_logging(diagnostics::Enabled());
             // Diagnostics lift the cap: a presentation flickering between the
             // race and the virtual screen is exactly what a report needs to show.
             if ((!presentation_logged || policy.presentation != logged_presentation) &&