feat: track received image outcomes

tests/database.test.ts

@@ -81,6 +81,7 @@ describe('Database Client', () => {
       const columnNames = columns.map(c => c.name);
       expect(columnNames).toContain('got_response');
       expect(columnNames).toContain('response_checked_at');
+      expect(columnNames).toContain('got_image');
     });
 
     it('adds strategy_id column', () => {
@@ -157,6 +158,7 @@ describe('Database Client', () => {
       expect(columnMap.get('sent_at')?.notnull).toBe(1);
       expect(columnMap.get('post_id')?.notnull).toBe(0); // nullable — chat rows have no post
       expect(columnMap.get('chat_room_id')).toBeDefined();
+      expect(columnMap.get('got_image')).toBeDefined();
     });
 
     it('successful_messages has correct schema', () => {