Add D&D location occurrence extractor

internal/modules/dnd/extract/locationoccurrences/assets/prompts/task.md

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+Extract Dungeons & Dragons location occurrences from the supplied transcript.
+
+Include an occurrence only when the transcript establishes one supplied
+location, one occurrence kind, and a coherent passage supporting both. Use
+only the exact ID and name pair from the supplied location registry. Return an
+empty occurrences array when no supplied location has an evidenced occurrence
+in this transcript passage.
+
+Use exactly one kind per occurrence:
+
+- visited: party members are physically present, arrive, remain, or depart;
+- planned: the party explicitly proposes, intends, or agrees to future travel;
+- recalled: the transcript explicitly recounts an earlier party visit; or
+- mentioned: the location is explicitly referenced without stronger support.
+
+For overlapping support, visited outranks planned, recalled, and mentioned;
+planned outranks recalled and mentioned; recalled outranks mentioned. A passage
+may produce multiple records when it independently establishes separate facts,
+such as recalling an earlier visit while planning a return. Omit inferred,
+uncertain, hypothetical, or unsupported places and occurrences.