feat: frame

app/engine.js

@@ -34,6 +34,9 @@ export default class Engine {
     const engine = this;
     const server = this.server = new SilphiusServer();
     this.Ecs = class EngineEcs extends Ecs {
+      get frame() {
+        return engine.frame;
+      }
       async readAsset(uri) {
         return server.readAsset(uri);
       }