Move NPC registry to canonical namespace

internal/cli/npc_registry_contract_test.go

@@ -38,7 +38,7 @@ pipelines:
         extract:
           module: dnd/spells
           references:
-            npcs: %q
+            npc_registry: %q
         normalize: dnd/spells
 `, checkpointRoot, npcPath)
 	configPath := filepath.Join(t.TempDir(), "config.yml")
@@ -66,7 +66,7 @@ pipelines:
 		"--input", repositoryPath("examples", "seriatim-minimal-transcript.json"),
 		"--chunk_cache", "bypass", "--output-dir", t.TempDir(),
 	}, &stdout, &stderr, options)
-	for _, fragment := range []string{`pipeline "dnd-session"`, `reference slot "npcs"`, "1048577 bytes", "limit 1048576"} {
+	for _, fragment := range []string{`pipeline "dnd-session"`, `reference slot "npc_registry"`, "1048577 bytes", "limit 1048576"} {
 		if code == 0 || !strings.Contains(stderr.String(), fragment) {
 			t.Fatalf("RunWithOptions() code = %d stderr = %q, want context fragment %q", code, stderr.String(), fragment)
 		}