Update D&D prompt definitions to shallow asset paths

internal/modules/chunk/dnd/scenes/assets/prompts/dnd.scenes.yaml

@@ -23,9 +23,9 @@ messages:
     cache_control:
       type: ephemeral
   - role: user
-    content_file: ./dnd/scenes/task.md
+    content_file: ./task.md
   - role: user
-    content_file: ./dnd/scenes/instructions.md
+    content_file: ./instructions.md
 output:
   format: json
   validation_mode: json_schema

internal/modules/chunk/dnd/scenes/prompt_fs.go

@@ -11,12 +11,31 @@ import (
 	"time"
 )
 
-func modulePromptFS() (fs.FS, error) {
-	return promptMapFSFromEmbedded(map[string]string{
-		"assets/prompts/dnd.scenes.yaml":            "assets/prompts/dnd.scenes.yaml",
-		"assets/prompts/dnd/scenes/task.md":         "assets/prompts/task.md",
-		"assets/prompts/dnd/scenes/instructions.md": "assets/prompts/instructions.md",
+func modulePromptFS(shared fs.FS) (fs.FS, error) {
+	assetFS, err := promptMapFSFromEmbedded(map[string]string{
+		"assets/prompts/dnd.scenes/dnd.scenes.yaml": "assets/prompts/dnd.scenes.yaml",
+		"assets/prompts/dnd.scenes/task.md":         "assets/prompts/task.md",
+		"assets/prompts/dnd.scenes/instructions.md": "assets/prompts/instructions.md",
 	})
+	if err != nil {
+		return nil, err
+	}
+	assets := assetFS.(promptMapFS)
+	if shared == nil {
+		return assets, nil
+	}
+	for _, name := range []string{
+		"common-dnd-system.md",
+		"common-dnd-transcript.md",
+		"common-dnd-references.md",
+	} {
+		data, err := fs.ReadFile(shared, name)
+		if err != nil {
+			return nil, fmt.Errorf("read shared prompt asset %s: %w", name, err)
+		}
+		assets["assets/prompts/dnd.scenes/"+name] = append([]byte(nil), data...)
+	}
+	return assets, nil
 }
 
 func promptMapFSFromEmbedded(files map[string]string) (fs.FS, error) {

internal/modules/chunk/dnd/scenes/scriptorium_assets.go

@@ -3,6 +3,7 @@ package scenes
 import (
 	"bytes"
 	"fmt"
+	"io/fs"
 	"sort"
 	"sync"
 
@@ -14,7 +15,11 @@ import (
 const scriptoriumPromptRoot = "assets/prompts"
 
 func RegisterPromptAssets(registry *llm.AssetRegistry) error {
-	promptFS, err := modulePromptFS()
+	sharedPromptFS, err := promptSharedFS()
+	if err != nil {
+		return fmt.Errorf("prepare shared prompt assets: %w", err)
+	}
+	promptFS, err := modulePromptFS(sharedPromptFS)
 	if err != nil {
 		return fmt.Errorf("prepare scene prompt assets: %w", err)
 	}
@@ -24,6 +29,14 @@ func RegisterPromptAssets(registry *llm.AssetRegistry) error {
 	return registry.RegisterSchemaFS(embeddedAssets, "assets/schemas")
 }
 
+func promptSharedFS() (fs.FS, error) {
+	registry := llm.NewAssetRegistry()
+	if err := sharedassets.Register(registry); err != nil {
+		return nil, err
+	}
+	return registry.PromptFS()
+}
+
 func promptInputs(req contracts.ChunkRequest) contracts.LLMInputSet {
 	return contracts.LLMInputSet{
 		"transcript": transcriptPromptInput(req.SourceInput),