Compose saved Scenario authoring with current Text and input authority

crates/oa-core/src/projection.rs

@@ -278,6 +278,11 @@ fn project_diagram_impl(
     mut availability: Option<&mut BTreeMap<Id, crate::view_options::EdgeAvailability>>,
     index: Option<&crate::view_options::ViewIndex>,
 ) -> ProjectedView {
+    // Saved Scenario layout is not an architecture/state projection. Its dedicated
+    // renderer is not wired yet; never interpret its payload through this fallback.
+    if d.projection.scenario().is_some() {
+        return ProjectedView::default();
+    }
     let parents = parents(p, d);
     let mut nodes = Vec::new();
     for n in d.nodes.values() {
@@ -394,6 +399,7 @@ fn project_diagram_impl(
             continue;
         }
         let included = match d.projection {
+            ProjectionKind::Scenario { .. } => false,
             ProjectionKind::StateMachine { machine } => matches!(&r.body,
                 RelationBody::StateTransition { transition_kind, .. }
                     if *transition_kind != TransitionKind::Internal