Add Scriptorium prompt assets

internal/modules/extract/dnd/spells/assets/scriptorium/prompts/dnd.spells.yaml

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+id: dnd.spells
+version: "v1"
+inputs:
+  - name: transcript
+    required: true
+    content_type: application/json
+  - name: roster
+    required: false
+    content_type: text/plain
+  - name: glossary
+    required: false
+    content_type: text/plain
+messages:
+  - role: system
+    content_file: ./shared/system.md
+  - role: user
+    content_file: ./shared/transcript.md
+    cache_control:
+      type: ephemeral
+  - role: user
+    content_file: ./shared/references.md
+    cache_control:
+      type: ephemeral
+  - role: user
+    content_file: ./dnd/spells/task.md
+  - role: user
+    content_file: ./dnd/spells/instructions.md
+output:
+  format: json
+  validation_mode: json_schema
+  schema_path: dnd_spells.v1.json
+  repair_attempts: 0

internal/modules/extract/dnd/spells/assets/scriptorium/prompts/dnd/spells/instructions.md

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+Source references must use the source-unit IDs exactly as provided.
+
+Return only D&D spell-cast artifacts. For each spell cast, identify the in-world
+caster, spell name, effect, narrative description, and source references using
+source_id, start_unit_id, and end_unit_id.
+
+Use roster and glossary reference material only to clarify source text. Do not
+return spells, casters, or effects that are mentioned only in reference
+material.
+
+Return exactly one JSON object and no explanatory text.

internal/modules/extract/dnd/spells/assets/scriptorium/prompts/dnd/spells/task.md

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+Extract Dungeons & Dragons spell-cast artifacts from the provided transcript.
+
+Extract only spell casts that are supported by the transcript. Do not infer
+spells from general D&D knowledge or from table chatter that does not identify a
+spell being cast.