style(tools, llm): 统一导入顺序与代码格式

examples/task_agent_demo.rs

@@ -67,21 +67,33 @@ async fn main() {
     assert!(step.status.is_pending());
 
     step.status = StepStatus::Running;
-    println!("Running: pending={}, terminal={}", step.status.is_pending(), step.status.is_terminal());
+    println!(
+        "Running: pending={}, terminal={}",
+        step.status.is_pending(),
+        step.status.is_terminal()
+    );
 
     step.status = StepStatus::Completed(ChatResponse {
         message: OpenaiChatMessage::assistant_text("天气：晴，22°C"),
         usage: Usage::from_input_output(5, 10),
         stop_reason: Some(FinishReason::Stop),
     });
-    println!("Completed: pending={}, terminal={}", step.status.is_pending(), step.status.is_terminal());
+    println!(
+        "Completed: pending={}, terminal={}",
+        step.status.is_pending(),
+        step.status.is_terminal()
+    );
     assert!(step.status.is_terminal());
 
     // 3. 失败路径
     println!("\n=== Step 状态机：失败路径 ===");
     let mut fail_step = Step::new(0, "调用天气 API");
     fail_step.status = StepStatus::Failed(AgentError::Other("API 不可用".into()));
-    println!("Failed:  pending={}, terminal={}", fail_step.status.is_pending(), fail_step.status.is_terminal());
+    println!(
+        "Failed:  pending={}, terminal={}",
+        fail_step.status.is_pending(),
+        fail_step.status.is_terminal()
+    );
     assert!(fail_step.status.is_terminal());
 
     // 4. 跳过路径
@@ -110,4 +122,4 @@ async fn main() {
     assert!(matches!(err, AgentError::PlanParse(_)));
 
     println!("\n✓ task_agent_demo 完成");
-}
+}