feat: stabilize OpenSim interactions and landmarks

crates/metacrate-grid-agent/src/control_runtime.rs

@@ -59,6 +59,7 @@ struct RuntimeState {
     behavior: BehaviorMode,
     service_state: &'static str,
     region_id: Option<String>,
+    region_handle: Option<u64>,
     region_name: Option<String>,
     position: Option<[f64; 3]>,
 }
@@ -70,6 +71,7 @@ impl Default for RuntimeState {
             behavior: BehaviorMode::Offline,
             service_state: "starting",
             region_id: None,
+            region_handle: None,
             region_name: None,
             position: None,
         }
@@ -173,11 +175,13 @@ impl AgentControlTarget {
     pub fn update_region(
         &self,
         region_id: Option<String>,
+        region_handle: Option<u64>,
         region_name: Option<String>,
         position: Option<[f64; 3]>,
     ) {
         let mut state = lock(&self.state);
         state.region_id = region_id.filter(|value| value.len() <= 64);
+        state.region_handle = region_handle.filter(|value| *value != 0);
         state.region_name = region_name.filter(|value| value.len() <= 256);
         state.position =
             position.filter(|value| value.iter().all(|component| component.is_finite()));
@@ -259,6 +263,7 @@ impl AgentControlTarget {
                     transport_connected: state.session.transport_connected,
                     agent_ready: state.session.agent_ready,
                     region_id: state.region_id,
+                    region_handle: state.region_handle,
                     region_name: state.region_name,
                     position: state.position,
                     behavior_mode: behavior_name(state.behavior).to_owned(),