Centralize spell and combat-turn assets

assets/dnd/combat-turns/prompts/task.md

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+Extract Dungeons & Dragons combat-turn artifacts from the supplied transcript.
+
+Include a record only when the transcript establishes that an in-world
+participant takes a combat turn or performs a discrete interrupting combat
+event. Interrupting events belong at the point where they occur in transcript
+chronology.
+
+Exclude initiative setup without a turn or combat event, tactical planning,
+table talk, rules lookup, hypothetical events, abandoned intentions, recaps
+outside the current passage, and downstream consequences.
+
+Do not infer combat events from D&D rules knowledge. Preserve the session as
+played and attribute relevant nonstandard rulings to the GM or table.
+
+Unmatched actors remain permitted.
+
+Place all supporting transcript ranges for a turn in its turn-level source_refs
+collection.