Implement native AgentManager services (#59)

crates/libremetaverse/src/caps.rs

@@ -256,6 +256,12 @@ impl Caps {
         Ok(read(&self.inner.caps).get(&capability).cloned())
     }
 
+    pub(crate) fn seed_request_finished(&self) -> bool {
+        mutex(&self.inner.seed_task)
+            .as_ref()
+            .is_none_or(|task| task.handle.is_finished())
+    }
+
     pub fn disconnect(&self, immediate: bool) -> Result<(), Error> {
         self.inner.disconnect(immediate);
         Ok(())