Improve orchestration agent model selection

app/src/ai/harness_availability.rs

@@ -47,7 +47,7 @@ pub struct HarnessAvailability {
 fn default_harnesses() -> Vec<HarnessAvailability> {
     vec![HarnessAvailability {
         harness: Harness::Oz,
-        display_name: "Warp".to_string(),
+        display_name: harness_display::display_name(Harness::Oz).to_string(),
         enabled: true,
         available_models: vec![],
     }]
@@ -144,6 +144,9 @@ impl HarnessAvailabilityModel {
     }
 
     pub fn display_name_for(&self, harness: Harness) -> &str {
+        if harness == Harness::Oz {
+            return harness_display::display_name(harness);
+        }
         self.harnesses
             .iter()
             .find(|h| h.harness == harness)