Fixed

• Barrel upgrade item duplication — applying a barrel upgrade no longer drops a duplicate copy of the barrel's contents into the world while preserving them in the upgraded barrel. The old block entity is cleared before the block is replaced so onRemove has nothing to drop.
• Wrench shift+right-click not breaking pipes — wrench item now bypasses vanilla's sneak-use suppression (doesSneakBypassUse), so shift+right-clicking a pipe with the wrench correctly breaks and drops it.
• Wrench right-click on attachment now opens its GUI — previously the wrench's "toggle disconnect" action triggered first, silently disconnecting the pipe side instead of opening the attachment. Toggle disconnect still works on bare pipe sides.
• Removing an attachment clears stale disconnect state — if a side was toggled disconnected (e.g. accidentally with the wrench while the attachment was installed), removing the attachment now resets that side so the pipe reconnects to the adjacent inventory.