Converted all external tool calling to async

server/src/service/work_item/delete.rs

@@ -95,7 +95,7 @@ pub async fn delete_work_item(
 
     // 1. Stop any running/pending agents (best-effort).
     let mut agents_stopped: Vec<String> = Vec::new();
-    if let Ok(agent_list) = agents.list_agents() {
+    if let Ok(agent_list) = agents.list_agents().await {
         for agent in agent_list.iter().filter(|a| a.story_id == story_id) {
             match agents
                 .stop_agent(project_root, story_id, &agent.agent_name)
@@ -120,7 +120,7 @@ pub async fn delete_work_item(
     }
 
     // 2. Remove agent pool entries.
-    let removed_count = agents.remove_agents_for_story(story_id);
+    let removed_count = agents.remove_agents_for_story(story_id).await;
     slog_warn!("[delete_work_item] Removed {removed_count} agent pool entries for '{story_id}'");
 
     // 3. Remove worktree (best-effort).
@@ -240,6 +240,7 @@ mod tests {
         // Agent pool must have no entries for this story.
         let pool_entries = agents
             .list_agents()
+            .await
             .unwrap_or_default()
             .into_iter()
             .filter(|a| a.story_id == story_id)