Adventure Tents barrel no-save test

This build includes a temporary debug switch to test the new safe-pack barrel guard.

Commands:
/function atent:debug/barrel_no_save_on
/function atent:debug/barrel_no_save_off
/function atent:debug/barrel_no_save_status

Test:
1. Place a tent. For your reported case, place a LARGE tent facing north.
2. Put a clearly identifiable item into the tent barrel.
3. Run /function atent:debug/barrel_no_save_on
4. Try to pack the tent. Expected result: packing is blocked, the tent remains placed, and the item stays in the barrel.
5. Run /function atent:debug/barrel_no_save_off
6. Try to pack again. Expected result: the tent packs normally and the contents restore when the tent is placed again.

What the switch does:
When ON, the pack function still finds the barrel, but the captured temporary barrel storage is intentionally cleared before the safe-pack verification step. This simulates a failed barrel save so the safety guard can prove it refuses teardown.

Do not leave this enabled in normal play.
