Consumable effects

A LivingRef on the server can apply one effect from an item's loaded consumable with living.apply_consume_effect(host, &stack, index). The index is zero-based in component order; this does not eat food, shrink the stack or run consume triggers. Some(true) or Some(false) is the effect's result; None means the item, index or target is unavailable or the effect is unsupported. Mob random teleport, armor stands and dragons are not supported. Player random teleport uses the level random as normal.

Mod-defined kinds dispatch through the ordinary consume_effect hook. For these kinds, Some(true) means dispatch was entered, not that a listener changed game state; an unclaimed kind still does nothing. Reapplying the same kind from inside its own handler on the same call stack returns Some(false) without recursion. Another kind, including one owned by another mod, dispatches normally, and a later independent call can apply the original kind again. This deliberately reverses #550's original blanket exclusion of mod-defined kinds; it is not a second consume hook or an alternate dispatch path.