Add D&D scene description extractor

internal/modules/dnd/extract/scenedescriptions/assets/prompts/dnd.scene_descriptions.yaml

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+id: dnd.scene_descriptions
+version: "v1"
+default_profile: gemini-2-flash
+inputs:
+  - name: transcript
+    required: true
+    content_type: application/json
+  - name: players
+    required: false
+    content_type: text/plain
+  - name: party
+    required: false
+    content_type: text/plain
+  - name: glossary
+    required: false
+    content_type: text/plain
+messages:
+  - role: system
+    content_file: ./sharedassets/common-dnd-system.md
+  - role: user
+    content_file: ./sharedassets/common-dnd-identity.md
+    cache_control:
+      type: ephemeral
+  - role: user
+    content_file: ./sharedassets/common-dnd-references.md
+    cache_control:
+      type: ephemeral
+  - role: user
+    content_file: ./task.md
+  - role: user
+    content_file: ./instructions.md
+    cache_control:
+      type: ephemeral
+  - role: user
+    content_file: ./sharedassets/common-dnd-transcript.md
+output:
+  format: json
+  validation_mode: json_schema
+  schema_path: dnd_scene_descriptions_llm.v1.json
+  repair_attempts: 0

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

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+Choose exactly one kind: combat, narrative, recap, or meta. When a chunk is
+mixed, use this precedence: combat, then recap, then meta, then narrative.
+
+The title should identify the central event or subject. The summary should
+describe only what the accepted chunk establishes. Campaign references may
+disambiguate names but never add events or lore.
+
+Do not return identifiers, source identifiers, source ranges, unit identifiers,
+participants, confidence, or any fields besides kind, title, and summary.

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

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+Describe exactly one accepted Dungeons & Dragons scene from the supplied
+transcript chunk. The complete chunk is the evidence boundary: do not split it
+into multiple scenes or use facts that are not supported by it.
+
+Return one kind, one concise title, and one concise summary.