Centralize spell and combat-turn assets

assets/dnd/spells/prompts/task.md

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+Extract Dungeons & Dragons spell-cast artifacts from the provided transcript.
+
+Include an actual casting event or an unambiguous declared casting attempt.
+Exclude spell mentions, hypothetical plans, rules discussion, and catalog
+matches that do not establish a casting event in the transcript.
+
+Use the provided canonical spell-name catalog when naming each extracted spell.
+Return the canonical catalog spelling exactly. The catalog is a recognition
+aid and never evidence that a spell was cast.