feat: support freeform persona initialization seeds

tests/persona.test.ts

@@ -53,6 +53,32 @@ describe('initializePersona', () => {
     expect(facts.map((fact) => fact.statement)).toContain('Minji grew up near the sea.');
   });
 
+  it('accepts a single freeform persona seed string and forwards it to the biography generation step', async () => {
+    const db = await createDb();
+    const prompts: string[] = [];
+    const structured = createStructuredAdapter(prompts);
+    const seedText =
+      'Mina is 29, grew up in Busan, moved to Seoul for product design work, values loyalty and quiet consistency, loves indie music and late-night walks, dislikes loud restaurants, and is very close to her older brother Jisoo.';
+
+    const persona = await initializePersona(db, {
+      id: 'mina',
+      displayName: 'Mina',
+      seedText,
+      currentDate: '2026-05-11',
+      structuredModel: structured,
+    });
+
+    expect(persona).toMatchObject({
+      id: 'mina',
+      displayName: 'Mina',
+      spaceName: 'persona:mina',
+    });
+    expect(prompts[0]).toContain('Freeform persona seed');
+    expect(prompts[0]).toContain(seedText);
+    expect(prompts[0]).toContain('infer personality, history, values, likes, dislikes, and relationships');
+    expect(prompts[0]).toContain('Current date: 2026-05-11');
+  });
+
   it('does not call the image adapter unless a profile image is requested', async () => {
     const db = await createDb();
     const structured = createStructuredAdapter([]);