Add NPC normalization prompt context

internal/modules/dnd/normalize/npcs/assets/prompts/candidates.md

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+The supplied NPC candidates are below. Use only these display names in the
+response.
+
+{{ input "candidates" }}

internal/modules/dnd/normalize/npcs/assets/prompts/dnd.npcs.normalize.yaml

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+id: dnd.npcs.normalize
+version: "v1"
+default_profile: gemini-2-flash
+inputs:
+  - name: candidates
+    required: true
+    content_type: application/json
+  - name: transcript
+    required: true
+    content_type: application/json
+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: ./task.md
+  - role: user
+    content_file: ./instructions.md
+    cache_control:
+      type: ephemeral
+  - role: user
+    content_file: ./candidates.md
+  - role: user
+    content_file: ./sharedassets/common-dnd-transcript.md
+output:
+  format: json
+  validation_mode: json_schema
+  schema_path: dnd_npcs_normalize_llm.v1.json
+  repair_attempts: 0

internal/modules/dnd/normalize/npcs/assets/prompts/instructions.md

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+Return duplicate groups only when the transcript context clearly establishes a
+single individual. Prefer no group when identity is ambiguous.
+
+Copy supplied display names into each group's members. Choose canonical_name
+from that same group's supplied members. Prefer a complete stable proper name
+over an abbreviation, but prefer an unadorned proper name over that name plus a
+contextual class, role, title, or relationship descriptor unless the descriptor
+is established as part of the name.
+
+Do not invent names, source references, replacement records, or explanations.

internal/modules/dnd/normalize/npcs/assets/prompts/task.md

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+Identify only supplied NPC display names that clearly refer to the same
+individual in the supplied transcript context.

internal/modules/dnd/normalize/npcs/assets/schemas/dnd_npcs_normalize_llm.v1.json

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+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "notarius.dnd.npcs.normalize.llm",
+  "type": "object",
+  "additionalProperties": false,
+  "required": ["duplicate_groups"],
+  "properties": {
+    "duplicate_groups": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "additionalProperties": false,
+        "required": ["members", "canonical_name"],
+        "properties": {
+          "members": {
+            "type": "array",
+            "items": {"type": "string"}
+          },
+          "canonical_name": {"type": "string"}
+        }
+      }
+    }
+  }
+}