Implement operation-time D&D NPC artifact handoff

internal/modules/dnd/normalize/combatturns/normalizer_test.go

@@ -70,6 +70,36 @@ func TestNormalizeCanonicalizesFieldsAndRegistryIdentities(t *testing.T) {
 	}
 }
 
+func TestNormalizeResolvesOperationNPCOverrideWithoutSingletonMetadata(t *testing.T) {
+	doc := testDocument()
+	normalizer, err := New(Options{})
+	if err != nil {
+		t.Fatalf("New() error = %v", err)
+	}
+	input := dnd.CombatTurnList{CombatTurns: []dnd.CombatTurn{{
+		Actor:      "Storm",
+		TurnKind:   dnd.CombatTurnKindTurn,
+		Actions:    []dnd.CombatAction{{Category: dnd.CombatActionCategoryAttack, Declaration: "attacks", Targets: []string{"Minion"}}},
+		Summary:    "Storm attacks",
+		SourceRefs: []source.SourceRef{{SourceID: doc.ID, StartUnitID: 10, EndUnitID: 10}},
+	}}}
+	result, err := normalizer.Normalize(context.Background(), contracts.TypedNormalizeRequest[dnd.CombatTurnList]{
+		Source:      doc,
+		MergeOutput: contracts.MergeArtifact[dnd.CombatTurnList]{Value: input},
+		References:  npcReferences(t),
+	})
+	if err != nil {
+		t.Fatalf("Normalize() error = %v", err)
+	}
+	turn := result.Value.CombatTurns[0]
+	if turn.Actor != "Aria" || turn.Actions[0].Targets[0] != "Goblin" {
+		t.Fatalf("operation-normalized turn = %#v, want Aria/Goblin", turn)
+	}
+	if metadata := normalizer.ManifestMetadata(); metadata["npc_registry_digest"] != nil || metadata["npc_count"] != nil {
+		t.Fatalf("singleton metadata = %#v, want no operation-varying NPC identity", metadata)
+	}
+}
+
 func TestNormalizeOrdersBySourcePositionAndCollapsesExactDuplicates(t *testing.T) {
 	doc := &source.SourceDocument{ID: "session", Units: []source.SourceUnit{{ID: 50}, {ID: 10}, {ID: 90}}}
 	first := validTurn("Aria", source.SourceRef{SourceID: doc.ID, StartUnitID: 50, EndUnitID: 50})