SoulSiphonKillListener

Grants a soul stack when a player finishes off an elite with a hoe.

The stack used to be granted by the generic STACKING hit path in com.magmaguy.elitemobs.api.EliteMobDamagedByPlayerEvent, which meant every swing banked a soul and the 12 second decay window never lapsed - the bar sat permanently full and the skill paid its full-stack bonus as if it were a flat passive.