Platform: VR 90+ FPS, comfort-first design, and motion control accuracy define VR development. NEVER Do (Expert VR Rules) Rendering & Comfort - NEVER drop below 90 FPS — In VR, 72 FPS or less causes instant nausea. You MUST maintain at least 90 FPS (Meta Quest 2/3 typical) and minimize rendering jank. - NEVER use smooth rotation without a vignette (comfort mask) — Smooth rotation causes motion sickness. Always provide snap turning OR dynamic vignetting. - NEVER force 3D MSAA if Foveated Rendering is enabled — Foveation can conflict with MSAA natively in the OpenXR pipeline on some hardware. L…