FOrreryTerrainAuthoringSync

A map closing never captures, so closing without saving keeps the asset as it was.

• Dirty: a sculpt, paint, feature or undo in a tracked editor world (OnGroundChanged with cause Commit, Undo, or Sculpt) marks the world dirty; a restore (Load), streaming and extension writes do not. The next frame marks the asset's package dirty (never inside an undo, where the engine refuses it), so Save All asks.

• The asset: <Map>_TerrainAuthoring beside the map, or in Project Settings > Orrery Terrain Editor > Authoring Folder. It is made on the first edit of a saved map. An unsaved map keeps a transient asset, which the map's first save replaces with the real one.

• Saving the map captures into the asset before the map is written and saves the asset after it, as the engine saves a map's built data. An autosave captures and leaves the asset to the autosaver.

• Undo: the sync names its asset on the actor outside any transaction, so an undo of an older actor transaction can bring back the reference it replaced. The re-create that follows keeps the sync's asset, which holds the live state just captured, instead of restoring the older one.

• The cook logs an Error, Warning or nothing (UOrreryTerrainEditorSettings::UnbakedCook) for each terrain actor whose authoring asset holds a payload: the cook drops the asset, so the cooked game lacks the authored ground. An Error makes the cook commandlet exit non-zero. The map check warns too.