feat(client): await managed updates from blocking callers

crates/irtt-client/src/managed/blocking_tests.rs

@@ -250,15 +250,11 @@ fn dynamic_update_reaches_background_worker() {
         .unwrap();
     let handle = owner.handle();
 
-    let acknowledgement = test_runtime().block_on(async {
-        timeout(
-            Duration::from_secs(2),
-            handle.update_targets(vec![target(&server)]).unwrap(),
-        )
-        .await
+    let acknowledgement = handle
+        .update_targets(vec![target(&server)])
         .unwrap()
-        .unwrap()
-    });
+        .blocking_wait()
+        .unwrap();
     assert_eq!(acknowledgement.sequence, 1);
     server.wait_probe();
     test_runtime().block_on(async {

crates/irtt-client/src/managed/task.rs

@@ -301,6 +301,19 @@ pub struct ManagedCommandReceipt {
     receiver: oneshot::Receiver<Result<ManagedCommandAcknowledgement, ManagedCommandApplyError>>,
 }
 
+impl ManagedCommandReceipt {
+    /// Block until the target-set transaction is applied or rejected.
+    ///
+    /// This is for synchronous callers such as [`BlockingManagedClient`]. It
+    /// must not be called from an asynchronous runtime; use the [`Future`]
+    /// implementation there instead.
+    pub fn blocking_wait(self) -> Result<ManagedCommandAcknowledgement, ManagedCommandApplyError> {
+        self.receiver
+            .blocking_recv()
+            .unwrap_or(Err(ManagedCommandApplyError::AcknowledgementDisconnected))
+    }
+}
+
 impl Future for ManagedCommandReceipt {
     type Output = Result<ManagedCommandAcknowledgement, ManagedCommandApplyError>;
     fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {