Extract shared D&D combat policy

internal/modules/dnd/extract/scenedescriptions/prompt_assets_test.go

@@ -42,6 +42,23 @@ func TestRegisterPromptAssetsPreparesSceneDescriptionPrompt(t *testing.T) {
 	if prepared.PromptID != PromptID || prepared.OutputContract.SchemaPath != "dnd_scene_descriptions_llm.v1.json" {
 		t.Fatalf("prepared prompt = %#v, want scene-description prompt identity and schema wiring", prepared)
 	}
+	const combatPolicySentinel = "substantive active combat materially organizes the"
+	transcriptIndex := -1
+	policyIndex := -1
+	instructionsIndex := len(prepared.Messages) - 1
+	policyOccurrences := 0
+	for index, message := range prepared.Messages {
+		if strings.Contains(message.Content, "scene-description-transcript") {
+			transcriptIndex = index
+		}
+		if count := strings.Count(message.Content, combatPolicySentinel); count > 0 {
+			policyIndex = index
+			policyOccurrences += count
+		}
+	}
+	if policyOccurrences != 1 || policyIndex <= transcriptIndex || policyIndex >= instructionsIndex {
+		t.Fatalf("combat policy appeared %d times at message %d; want once after transcript message %d and before instructions message %d", policyOccurrences, policyIndex, transcriptIndex, instructionsIndex)
+	}
 }
 
 func TestPromptMetadataAndDiagnosticsDoNotContainRawAssets(t *testing.T) {