Added normals to vertexdata

AgentData/lighting_and_skybox_plan.md

@@ -226,8 +226,8 @@ graph LR
 
 ---
 
-## Open Questions
+## Open Questions (Answered)
 
-1. **Cubemap source** — procedural gradient skybox (no asset needed) vs actual HDR cubemap `.dds` file?
-2. **Sampler heap** — does the engine already have a linear sampler registered, or does one need to be created?
-3. **Specular** — want Blinn-Phong specular in Phase 2, or just diffuse + ambient for now?
+1. **Cubemap source** — **Procedural gradient skybox** chosen because asset loading infrastructure is not yet established.
+2. **Sampler heap** — Evaluate what exists. However, with a procedural skybox, we won't need a sampler for Phase 3! (The sky color can be procedurally generated from the reconstructed view direction).
+3. **Specular** — **Blinn-Phong** specular, structured in an agnostic way so PBR (physically based rendering) parameters can be plugged in later.