topology: operator-driven move-agent via set_parent (#486)

hive-sh4re/src/lib.rs

@@ -46,6 +46,15 @@ pub enum HostRequest {
     Approve { id: i64 },
     /// Deny a pending request by id.
     Deny { id: i64 },
+    /// Move an agent in the topology tree (#486). Pass `new_parent =
+    /// None` to promote the agent to root, or `Some(name)` to set a
+    /// new parent. Refuses cycles, unknown agents, and any attempt
+    /// to reparent the manager (which is structurally root).
+    /// Pure topology-json edit today; bind-mount work follows in #361.
+    SetParent {
+        child: String,
+        new_parent: Option<String>,
+    },
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]