docs(README): add architecture figure to Model details

Adds an architecture diagram (image/video inputs, patch embedding, 40-block transformer stack, and a transformer-block internals callout) at the top of the Model details section, pairing the visual with the spec table. Figure is deterministic matplotlib output at 2791px width.

.gitattributes

@@ -34,3 +34,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zst filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
 *.gif filter=lfs diff=lfs merge=lfs -text
+assets/architecture.png filter=lfs diff=lfs merge=lfs -text

README.md

@@ -78,6 +78,10 @@ with torch.inference_mode():
 
 ## Model details
 
+<p align="center">
+  <img src="assets/architecture.png" width="820" alt="Motif Vision Encoder architecture: image and video inputs, patch embedding, 40-block transformer stack, and transformer block internals"/>
+</p>
+
 | | |
 |---|---|
 | Backbone | ViT-7B, patch 16, embed 4096, depth 40, heads 32, SwiGLU |