feat: use FactExtractor

tests/persona.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest';
-import { InMemoryMemoryStore, Persona, type FactDraft } from '../src';
+import { InMemoryMemoryStore, Persona } from '../src';
 
 describe('Persona initialization', () => {
   it('creates a new isolated persona space from displayName and seed message', async () => {
@@ -10,15 +10,13 @@ describe('Persona initialization', () => {
       now: '2026-05-01T10:00:00.000Z',
       debug: (event) => { debug.push(event.name); },
       models: {
-        initialization: {
-          async extractInitialFacts(input): Promise<FactDraft[]> {
-            return [
-              {
-                statement: `${input.displayName} likes quiet cafes.`,
-                topics: ['persona', input.displayName],
-                source: 'test',
-              },
-            ];
+        factExtractor: {
+          async extract(input) {
+            return {
+              statement: 'Mina likes quiet cafes.',
+              topics: [{ name: 'persona' }, { name: 'Mina' }],
+              source: 'test',
+            };
           },
         },
       },