feat: add persona initialization

tests/memory.test.ts

@@ -57,4 +57,28 @@ describe('persistFactDrafts', () => {
     expect(facts).toEqual([]);
     expect(await db.getSpaceByName('persona:empty')).toBeNull();
   });
+
+  it('keeps fact source metadata consistent when a draft overrides source', async () => {
+    const db = await createDb();
+
+    const [fact] = await persistFactDrafts(db, {
+      spaceName: 'persona:source-test',
+      domain: 'persona.biography',
+      source: 'boxbrain:batch',
+      facts: [
+        {
+          statement: 'Minji wrote a diary entry.',
+          source: 'boxbrain:draft',
+          topics: [{ name: 'Minji' }, { name: 'diary entry' }],
+        },
+      ],
+    });
+
+    expect(fact?.source).toBe('boxbrain:draft');
+    expect(fact?.metadata).toMatchObject({
+      boxbrain: {
+        source: 'boxbrain:draft',
+      },
+    });
+  });
 });