Add D&D item event extractor

internal/modules/dnd/extract/itemevents/assets/prompts/instructions.md

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+Return one event only when the transcript establishes a meaningful item or
+currency occurrence. Use a concise observed item name and preserve the stated
+currency denomination; include quantity only when the transcript explicitly
+states it.
+
+Use `discovered` when the party learns of or encounters an item without
+establishing possession. Use `acquired` when the party or a party member gains
+possession. Use `lost` when party possession ends through a gift, sale, payment,
+theft, abandonment, or destruction not caused by intended use. Use `consumed`
+when intended use depletes an item or currency. Use `transferred` only when
+possession moves between two distinct named party members.
+
+For `discovered`, omit both holders. For `acquired`, provide only `to`; for
+`lost` and `consumed`, provide only `from`; and for `transferred`, provide both
+`from` and `to`. Use `party` only for collective or unresolved party possession,
+never for either side of a transfer. Do not emit a transfer for a gift, sale, or
+payment outside the party.
+
+Ordinary non-depleting use is not an event. Do not infer acquisition from a
+discovery, or discovery from an acquisition: emit both only when each is
+independently established. Every event needs at least one narrow transcript
+range. Return no lore, inventory totals, aliases, or unstated holder details.