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_011_enchanted_grove/kq4_011_enchanted_grove.tscn

@@ -56,6 +56,7 @@ position = Vector2(151, 615)
 position = Vector2(1766, 74)
 polygon = PackedVector2Array(-108, 454, -87, 649, 376, 658, 348, 381)
 appear_at_node = "kq4_011_enchanted_grove"
+target = "uid://2x2iotcho43kp"
 label = "Haunted Forest"
 
 [node name="entrance" parent="kq4_012_haunted_forest" index="0"]