Move NPC registry to canonical namespace

assets/dnd/npc-registry/extract/prompts/instructions.md

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+Extract the individually identifiable Dungeons & Dragons non-player characters
+established by the provided transcript.
+
+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.
+
+Preserve observed display spelling. Do not invent a label for an anonymous
+creature, crowd, or generic role.