Preroll udpate

shaders/feedback-highlight-accumulator/shader.json

@@ -1,7 +1,7 @@
 {
   "id": "feedback-highlight-accumulator",
   "name": "Feedback Background Memory",
-  "description": "Demonstrates writable full-frame shader feedback by learning a persistent per-pixel background model, then comparing the live frame against that learned plate. This cannot be reproduced by only reading ordinary history frames because the shader writes its own evolving state back each frame.",
+  "description": "Learns a persistent per-pixel background plate in shader-local feedback and compares the live frame against that evolving full-frame state.",
   "category": "Feedback",
   "entryPoint": "updateBackgroundModel",
   "passes": [