Map projections' depth like the client's renderer

IMVU's projections give depth from -1 to 1; its Direct3D renderer maps it to 0 to 1, and now so does ours. Without that, the nearer half of the depth range was clipped, the whole 2D overlay (name tags, the frame rate, the room's title) with it. The adapter also draws drawTrianglesFromMemory without indices, and sums up what the client draws in its log.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

renderer/scene.hpp

@@ -122,7 +122,6 @@ private:
     bool onscreen_ = false; // in a frame drawn into the window
     bool draw_ = true;
     std::uint64_t lastSentAt_ = 0;
-    int spritesLogged_ = 0;
     int offsetX_ = 0;
 };