Refresh unit requests and preserve shared compilation across runtime shutdown

userland/init/src/main.rs

@@ -339,6 +339,8 @@ fn controls(services: &mut BTreeMap<String, Service>) {
         let Ok(request) = serde_json::from_slice::<Request>(&bytes) else {
             continue;
         };
+        // A unit edit can arrive after the event loop's scan but before this request.
+        scan(services);
         let mut reply = Reply {
             code: 0,
             text: String::new(),