Create room 046 (Tower Stairway) and wire to room 045

- Added kq4_046_tower_stairway scene
- South exit to room 045 (Genesta's Bed Chamber) - bidirectional connection
- North exit to room 047 (Tower Chamber) - room 047 doesn't exist yet, transition pending
- Updated room 045 to add return transition to room 046

scenes/kq4_046_tower_stairway/kq4_046_tower_stairway.tscn.uid

@@ -0,0 +1 @@
+uid://w801ak6vzoh4