Document scene-aware combat extraction

docs/integrations/dnd-npc-artifacts.md

@@ -109,12 +109,19 @@ steps:
       npcs:
         extract: dnd/npcs
         normalize: dnd/npcs
+      scene-descriptions:
+        extract: dnd/scene-descriptions
+        normalize: dnd/scene-descriptions
   - id: grounded-events
     references:
       npcs:
         artifact:
           step: identify-npcs
           lane: npcs
+      scene_descriptions:
+        artifact:
+          step: identify-npcs
+          lane: scene-descriptions
     artifacts:
       spells:
         extract: dnd/spells
@@ -124,13 +131,16 @@ steps:
         normalize: dnd/combat-turns
 ```
 
-The framework hands only an accepted normalized artifact across the barrier. It
-validates the canonical bytes against each consumer slot and clones the
-operation-time reference for the spell and combat consumers. Generated
+The framework hands only accepted normalized artifacts across the barrier. It
+validates the canonical bytes against each consumer slot and clones the NPC
+operation-time reference for spell and combat consumers. The accompanying
+scene-description reference is required by the combat extractor for eligibility
+only; its consumer contract is defined in the
+[D&D combat-turn artifact contract](dnd-combat-turn-artifacts.md). Generated
 provenance records the artifact kind, schema identity, media type, canonical
-digest, size, and producer step/lane/module, but not names, source
-ranges, or payload bytes. External normalized files remain supported as
-explicit references and retain their file provenance.
+digest, size, and producer step/lane/module, but not names, source ranges, or
+payload bytes. External normalized files remain supported as explicit references
+and retain their file provenance.
 
 NPC source references are registry provenance and are never accepted as spell
 or combat evidence. Current transcript units remain the only event evidence.