Document D&D enemy event artifacts

docs/integrations/dnd-npc-artifacts.md

@@ -60,10 +60,13 @@ relationship fields.
 Only individually identifiable NPC names with transcript evidence belong in
 this artifact. Groups, generic roles, invented labels, and descriptive
 enrichment are excluded. Its source references prove registry provenance; they
-do not become evidence for a spell, interaction, or combat occurrence.
+do not become evidence for a spell, interaction, combat, or enemy-event
+occurrence.
 
 This registry can ground actor or caster names in the [spell](dnd-spell-artifacts.md)
 and [combat-turn](dnd-combat-turn-artifacts.md) artifacts. It is required to
 resolve the canonical `name` in an [NPC interaction](dnd-npc-interaction-artifacts.md).
+The [enemy-event artifact](dnd-enemy-event-artifacts.md) also uses it only for
+subject grounding and canonical display names.
 The [JSON output contract](json-output.md) defines publication, and
 [D&D module internals](../internal/dnd.md) owns pipeline mechanics.