The user's save was bricked by teleporting to entry 100000304: the client
offers it in the map but NREs in AdventurePhase._EnterStep1_InitializeMapInfo
while loading, and the server had already saved that scene - every login
then replayed the broken scene (stuck on the train-window loading screen).
- loadScene no longer calls SavePersistent; SceneEntityMove's 5s cadence
persists the scene only once the client walks in it (the existing arena
guard already kept challenge scenes out of the save)
- reset persistent to entry 102020107 (proven walkable in the 01:00/01:38
sessions)