Centralize NPC LLM assets

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

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+Review NPC candidates and their cited transcript context to identify aliases
+that refer to the same individual. Propose only groups supported by the
+transcript, and preserve distinct individuals even when their names are
+similar.
+
+For every accepted group, choose as canonical only a supplied candidate from
+that evidence-supported duplicate group. Prefer a complete, stable proper name
+over an abbreviation. Prefer an unadorned proper name over that name plus a
+contextual class, role, title, or relationship descriptor unless the transcript
+establishes the descriptor as part of the person's name. A longer display name
+is not inherently more canonical; for example, do not prefer `Captain Aria`
+over `Aria` solely because it includes the contextual title `Captain`. Do not
+invent, edit, or combine display names.