Death sources and weapons at the loot hook

LootDrops::damage_source carries the death's damage type and causing/direct entity IDs. Non-death drops have no source. Environmental deaths retain their type, with 0 for absent or unknown IDs. player is remembered kill credit, not necessarily the attacker.

context.weapon_item(host) is the death-loot read corresponding to vanilla's DamageSource.getWeaponItem. Native and wasm listeners use the same read and retain all stack components, including custom names, enchantments and durability.

Projectile weapons are captured only when damage is accepted and remain bound to that accepted source. A later refused hit cannot replace them. They survive the projectile's removal before loot runs. A bow named “Longbow” with Power II still reads as that bow after its shooter switches to a stick. Melee remains live: a diamond sword with Sharpness V reads as an axe if the attacker switches to the axe before the read. Earlier loot listeners' hand edits are visible.

tool is the breaking or using tool (LootContextParams.TOOL), and is always None for entity deaths. For the causing entity's current hand independently of the damage source's weapon, resolve damage_source.causing with host.entity(id), then host.living(entity), and call living.hand_item(host, Hand::Main). Handle resolution can fail for an absent attacker. A shooter's current hand and its projectile's recorded weapon are separate values.

Projectile direct IDs are currently 0; melee direct IDs equal the causing ID. The recorded projectile weapon is carried separately in the call-scoped death context.

The live fallback follows damage_source.direct, rather than the causing entity. A harming potion has a nonliving direct entity and therefore never returns its thrower's held sword. If that direct entity is unavailable, the read returns None.