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.tscn

@@ -50,6 +50,21 @@ position = Vector2(506, 555)
 [node name="exit" parent="kq4_005_forest_grove" index="1"]
 position = Vector2(-64, 534)
 
+[node name="kq4_012_haunted_forest" parent="." unique_id=990092106 instance=ExtResource("4_transition")]
+position = Vector2(910, 542)
+polygon = PackedVector2Array(-108, 454, -87, 649, 376, 658, 348, 381)
+appear_at_node = "kq4_006_cave_entrance"
+target = "uid://2x2iotcho43kp"
+label = "Haunted Forest"
+
+[node name="entrance" parent="kq4_012_haunted_forest" index="0"]
+position = Vector2(118, 514)
+
+[node name="exit" parent="kq4_012_haunted_forest" index="1"]
+position = Vector2(151, 615)
+
 [connection signal="interacted" from="kq4_005_forest_grove" to="." method="_on_forest_grove_interacted"]
+[connection signal="interacted" from="kq4_012_haunted_forest" to="." method="_on_haunted_forest_interacted"]
 
 [editable path="kq4_005_forest_grove"]
+[editable path="kq4_012_haunted_forest"]