- update_todo: add `updates` param for bulk updates in one call
- mark_todo_done: add `todo_ids` param to mark multiple todos done
- mark_todo_pending: add `todo_ids` param to mark multiple pending
- delete_todo: add `todo_ids` param to delete multiple todos
- Increase todo renderer display limit from 10 to 25
- Maintains backward compatibility with single-ID usage
- Update prompts to keep todos short-horizon and dynamic