@builtin::assetTypes.scene.shared.swapOrchestrator

Owns the user-scope orchestration for scene swaps: leaves the prior scene's multiplayer room, gates concurrent loads via the __scene_load.begin/finish token, drives scene_loader.M.load for the new scene, and joins the new scene's room. Keeps the swap atomic from a multiplayer-sync standpoint (room transition + entity churn happen inside a single barrier).