chore: update readme.md

Author: laxmanclo

README.md

@@ -25,6 +25,10 @@ EPISODE LAYER (L1)   <- patterns auto-discovered via graph traversal.
 SENTENCE LAYER (L2)  <- raw conversation. Sequential NEXT edges. The full story.
 ```
 
+<p align="center">
+  <img src="assets/screenshots/layers.jpeg" alt="Three-layer memory graph: Facts → Episodes → Sentences" width="680" />
+</p>
+
 Search hits Facts, graph discovers Episodes, traces back to source Sentences. One database, Postgres or SQLite. No Neo4j, no Qdrant, no infra drama.
 
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