feat(impression): add vector index skeleton

Partner-Core/src/main/java/work/slhaf/partner/core/cognition/impression/ImpressionCore.java

@@ -22,6 +22,7 @@ public class ImpressionCore implements StateSerializable {
      * Keyed by entity uuid. Subject can be revised or merged later, so it should not be used as the stable key.
      */
     private final ConcurrentHashMap<String, Entity> knownEntitiesByUuid = new ConcurrentHashMap<>();
+    private final ImpressionVectorIndex vectorIndex = new ImpressionVectorIndex();
 
     @CapabilityMethod
     public void updateRelation() {
@@ -66,6 +67,7 @@ public class ImpressionCore implements StateSerializable {
 
             Entity entity = new Entity(uuid, subject);
             entity.load();
+            vectorIndex.sync(entity);
             knownEntitiesByUuid.put(uuid, entity);
         }
     }

Partner-Core/src/main/java/work/slhaf/partner/core/cognition/impression/ImpressionVectorIndex.java

@@ -0,0 +1,13 @@
+package work.slhaf.partner.core.cognition.impression;
+
+public class ImpressionVectorIndex {
+
+    public void sync(Entity entity){
+        // TODO sync entity impressions/features with vector index.
+    }
+
+    public void upsert(String content, Entity.IndexableData indexableData){
+        // TODO update vector for content when embedding/vector client boundary is finalized.
+    }
+
+}