Create room 042 (Fisherman's Shack Inside) and wire to room 007

- Added kq4_042_fishermans_shack_inside scene with south exit to room 007
- Updated room 007 to add transition to room 042 (bidirectional connection)
- Fixed corrupted room 007 script file
- Both transitions validated with exit checker

scenes/kq4_042_fishermans_shack_inside/kq4_placeholder_template.gd.uid

@@ -0,0 +1 @@
+uid://bk8q2nad4pu44