PlayerEquipment.getCurrentBindResistance/setCurrentBindResistance and
getCurrentCollarResistance/setCurrentCollarResistance all checked
instanceof ItemBind/ItemCollar — V2 DataDrivenBondageItem silently
returned 0, making V2 items escapable in 1 struggle roll.
Fix: use instanceof IHasResistance which both V1 and V2 implement.
Also fix StruggleCollar.tighten() to read ResistanceComponent directly
for V2 collars instead of IHasResistance.getBaseResistance(entity)
which triggers the singleton MAX-scan across all equipped items.
Note: isItemLocked() dead code in StruggleState is a PRE-EXISTING bug
(x10 locked penalty never applied) — tracked for separate fix.
b97bdf367e