Add standalone D&D combat turn extraction

internal/modules/dnd/extract/combatturns/assets/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. Reactions, legendary actions, lair actions, and other out-of-turn events
+belong at the point where they occur in transcript chronology.
+
+Report only the declaration and its immediate observed resolution. Immediate
+resolution may include directly associated rolls, damage, healing, movement,
+conditions, target outcomes, or an interruption. Do not follow consequences
+that occur on later turns or elsewhere in the scene.
+
+Exclude initiative setup without a turn or combat event, tactical planning,
+table talk, rules lookup, hypothetical actions, abandoned declarations, recap
+of combat outside the current passage, and downstream consequences.
+
+Use only the supplied transcript as evidence. Do not infer a round, target,
+roll, amount, condition, outcome, or action classification from D&D rules
+knowledge. Preserve the session as played; attribute relevant nonstandard
+rulings to the GM or table.
+
+The actor must be the in-world character or creature, not a player, transcript
+speaker, or GM. Use player, party, glossary, and NPC reference material only
+to disambiguate identities. Reference material is context, never combat
+evidence. Unmatched actors and targets remain permitted.
+
+For every factual detail in a turn, cite all supporting transcript units in the
+turn-level source_refs collection. Use narrow ranges when evidence is
+non-contiguous. Numeric source-unit IDs identify transcript units; they do not
+establish chronology outside the supplied transcript.