Create room 012 (Haunted Forest) and wire to rooms 006 and 011

- Added kq4_012_haunted_forest scene with north exit to room 006 and west exit to room 011
- Updated room 006 to add south exit to room 012 (bidirectional connection)
- Updated room 011 to add target UID for room 012 transition
- Room 012 south exit to room 018 omitted (room 018 doesn't exist yet)
- All 4 transitions validated with exit checker

scenes/kq4_006_cave_entrance/kq4_006_cave_entrance.gd

@@ -3,3 +3,7 @@ extends Scene
 
 func _on_forest_grove_interacted() -> void:
 	$kq4_005_forest_grove.default_script(self)
+
+
+func _on_haunted_forest_interacted() -> void:
+	$kq4_012_haunted_forest.default_script(self)