Move editor scripts to Assets/Scripts/Editor (PlaySceneWindow, SceneCollection),
move DefaultNetworkPrefabs and the Main Camera custom blends asset into
Assets/Settings, and shelve the unused HeroCutout shader/include under
Assets/Unused. Rename the Chameleon background texture, delete the obsolete
DefaultParentForEditor script and New Lighting Settings asset, add a The Room
SceneCollection asset, and drop the redundant Assets menu entry from the
StraightenKnees tool.
Main scene gets a full-rect Background image (Chameleon Background 1) in
the menu UI and re-enables a UI component. Lobby scene receives extensive
authoring (sky, lighting, props). New Lobby Sky and White Glow materials;
Yellow Glow emission toned down from ~89 to 64.