Use references in D&D spell extraction

internal/modules/extract/dnd/spells/assets/prompts/user.md

@@ -16,6 +16,19 @@ Source units:
 {{ end }}
 {{ end }}
 
+{{ if hasreference "roster" }}
+Roster reference material:
+{{ reference "roster" }}
+
+{{ end }}
+{{ if hasreference "glossary" }}
+Glossary reference material:
+{{ reference "glossary" }}
+
+{{ end }}
 Return only D&D spell-cast artifacts. For each spell cast, identify the in-world
 caster, spell name, effect, narrative description, and source references using
 source_id, start_unit_id, and end_unit_id.
+
+Use roster and glossary reference material only to clarify source text. Do not
+return spells, casters, or effects that are mentioned only in reference material.