refactor: Cleaned up some left-over implementation stubs

src/supervisor/mailbox.rs

@@ -48,10 +48,6 @@ impl Inbox {
 
         msgs
     }
-
-    pub fn pending_count(&self) -> usize {
-        self.messages.lock().len()
-    }
 }
 
 impl Clone for Inbox {

src/supervisor/mod.rs

@@ -15,7 +15,6 @@ use tokio::task::JoinHandle;
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum AgentExitStatus {
     Completed,
-    Cancelled,
     Failed(String),
 }
 
@@ -95,18 +94,6 @@ impl Supervisor {
         self.handles.get(id).map(|h| h.join_handle.is_finished())
     }
 
-    pub fn take_if_finished(&mut self, id: &str) -> Option<AgentHandle> {
-        if self
-            .handles
-            .get(id)
-            .is_some_and(|h| h.join_handle.is_finished())
-        {
-            self.handles.remove(id)
-        } else {
-            None
-        }
-    }
-
     pub fn take(&mut self, id: &str) -> Option<AgentHandle> {
         self.handles.remove(id)
     }

src/supervisor/taskqueue.rs

@@ -150,10 +150,6 @@ impl TaskQueue {
         false
     }
 
-    pub fn runnable_tasks(&self) -> Vec<&TaskNode> {
-        self.tasks.values().filter(|t| t.is_runnable()).collect()
-    }
-
     pub fn get(&self, task_id: &str) -> Option<&TaskNode> {
         self.tasks.get(task_id)
     }