Centralize NPC LLM assets

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

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+Extract the individually identifiable Dungeons & Dragons non-player characters
+established by the provided transcript and cite where each identity appears.
+
+Include an in-world non-PC participant only when the transcript gives it a
+proper name or a stable, individually distinguishing title or alias.
+
+Exclude human players, transcript speakers, and the GM as out-of-world people,
+player characters identified by the player or party references, incidental or
+hypothetical name drops, corrected transcription mistakes, anonymous or
+generic roles, indistinguishable crowds or groups, invented descriptive labels,
+and temporary summoned creatures or spell effects without a persistent
+individual identity.