refactor: remove redundant multi-line search index unwrap clones across all handlers via new get_search_index accessor

server/src/handlers/graph.rs

@@ -126,11 +126,7 @@ impl McpTool for CreateEntitiesHandler {
                 }
             }
         });
-        let idx = state
-            .search_index
-            .read()
-            .unwrap_or_else(|e| e.into_inner())
-            .clone();
+        let idx = state.get_search_index();
         for entity in inserted {
             drop(idx.index_entity(&entity));
         }
@@ -237,11 +233,7 @@ impl McpTool for DeleteEntitiesHandler {
             return Err(format!("Error: Entities not found: {}", missing.join(", ")));
         }
 
-        let idx = state
-            .search_index
-            .read()
-            .unwrap_or_else(|e| e.into_inner())
-            .clone();
+        let idx = state.get_search_index();
         for name in to_delete {
             drop(idx.delete_document(&name));
         }