Centralize location LLM assets

assets/dnd/locations/normalize/prompts/task.md

@@ -0,0 +1,8 @@
+Review location candidates and cited transcript context. Group candidates only
+when the evidence clearly identifies one physical place.
+
+Do not group candidates solely because their names match, their evidence is
+nearby, one place is nested inside another, or their labels are generic. Keep
+parent and child places, similarly named places, and uncertain aliases
+separate. For an accepted group, select the supplied candidate with the
+clearest established display name as canonical.