Define governed View projection contract

webui/src/platform/views.ts

@@ -84,11 +84,13 @@ export function isViewSurfaceVisible(
   surfaceId: string | null | undefined,
   catalogue: PlatformViewSurface[]
 ): boolean {
-  if (!surfaceId || !projection?.activeViewId) return true;
+  const projectionActive =
+    projection?.projectionActive ?? Boolean(projection?.activeViewId);
+  if (!surfaceId || !projectionActive) return true;
   const byId = new Map(catalogue.map((surface) => [surface.id, surface]));
   const surface = byId.get(surfaceId);
   if (!surface) return true;
-  const visible = new Set(projection.visibleSurfaceIds);
+  const visible = new Set(projection?.visibleSurfaceIds ?? []);
   let current: PlatformViewSurface | undefined = surface;
   const visited = new Set<string>();
   while (current) {

webui/src/types.ts

@@ -410,6 +410,7 @@ export type EffectiveViewProjection = {
   activeRevisionId: string | null;
   activeViewName: string | null;
   visibleSurfaceIds: string[];
+  projectionActive?: boolean;
   locked: boolean;
   availableViews: EffectiveViewOption[];
   provenance: Array<{