fix nested manifold result

src/index.ts

@@ -99,7 +99,7 @@ export class NestedManifoldRegion extends ManifoldRegion {
         const result = await this.nestedManifold.executeWorkflow(prompt);
         if (result) {
             log.debug(`Nested workflow execution successful, updating state`);
-            Object.assign(this.nestedManifold.state, this.nestedManifold.state);
+            Object.assign(this.nestedManifold.state, { ...this.nestedManifold.state, ...result });
         }
         return result;
     }

src/types.ts

@@ -1,4 +1,4 @@
-// src/types.d.ts
+// src/types.ts
 export interface WorkflowState {
   [key: string]: unknown;
   validated?: boolean;