Converted all external tool calling to async

server/src/agents/pool/auto_assign/watchdog/limits.rs

@@ -2,7 +2,7 @@
 
 use std::collections::HashMap;
 use std::path::Path;
-use std::sync::Mutex;
+use tokio::sync::Mutex;
 use tokio::sync::broadcast;
 
 use crate::agents::pool::StoryAgent;
@@ -83,7 +83,7 @@ pub(crate) fn count_turns_in_log(path: &Path) -> u64 {
 /// Turns and budget are counted from the **current session's** log file
 /// only — prior sessions are excluded so that restart counts from earlier
 /// runs do not accumulate against the limits.
-pub(super) fn check_agent_limits(
+pub(super) async fn check_agent_limits(
     agents: &Mutex<HashMap<String, StoryAgent>>,
     project_root: &Path,
 ) -> Vec<(String, TerminationReason)> {
@@ -94,10 +94,7 @@ pub(super) fn check_agent_limits(
 
     // Snapshot running agents: (key, story_id, agent_name, tx, log_session_id).
     let running: Vec<RunningAgentSnapshot> = {
-        let lock = match agents.lock() {
-            Ok(l) => l,
-            Err(_) => return Vec::new(),
-        };
+        let lock = agents.lock().await;
         lock.iter()
             .filter(|(_, agent)| agent.status == AgentStatus::Running)
             .map(|(key, agent)| {