test(platform-objects): guard against a half-landed BU rename (i18n labels)

Asserts sys_business_unit / sys_business_unit_member object + field labels across
all locales no longer retain the old 'department' term (the regression that the
prior PR fixed). Labels only — field descriptions, the `kind` enum value
'department', and the multi-concept node descriptions are intentionally in scope-out.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: os-zhuang

.changeset/bu-rename-guard-test.md

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+---
+---
+
+test-only: regression guard asserting the ADR-0057 BU rename did not half-land — `sys_business_unit` / `sys_business_unit_member` object + field labels carry no stale "department" term across en/zh/ja/es. No runtime change.

packages/platform-objects/src/apps/translations/bu-rename-consistency.test.ts

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+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+//
+// Regression guard for ADR-0057 (sys_department → sys_business_unit). The rename
+// once half-landed: the object label said "业务单元" while field labels still said
+// "上级部门" / "部门负责人". This asserts the object/plural label AND every FIELD
+// label across all locales no longer retains the old term.
+//
+// Scope is LABELS only — intentionally NOT field descriptions/help, NOT the `kind`
+// enum value `department` (a business unit can be OF KIND department), and NOT the
+// multi-concept node descriptions that list kinds. Those legitimately keep the word.
+
+import { describe, it, expect } from 'vitest';
+import { enObjects } from './en.objects.generated.js';
+import { zhCNObjects } from './zh-CN.objects.generated.js';
+import { jaJPObjects } from './ja-JP.objects.generated.js';
+import { esESObjects } from './es-ES.objects.generated.js';
+
+const LOCALES = [
+  { name: 'en', objs: enObjects as Record<string, any>, old: /\bDepartment\b/ },
+  { name: 'zh-CN', objs: zhCNObjects as Record<string, any>, old: /部门/ },
+  { name: 'ja-JP', objs: jaJPObjects as Record<string, any>, old: /部門/ },
+  { name: 'es-ES', objs: esESObjects as Record<string, any>, old: /Departamento/ },
+];
+const OBJECTS = ['sys_business_unit', 'sys_business_unit_member'];
+
+describe('ADR-0057 BU rename — no stale "department" in object/field labels', () => {
+  for (const { name, objs, old } of LOCALES) {
+    for (const objName of OBJECTS) {
+      it(`${name}: ${objName} object + field labels are fully renamed`, () => {
+        const o = objs[objName];
+        expect(o, `${objName} missing from ${name} bundle`).toBeTruthy();
+        for (const key of ['label', 'pluralLabel'] as const) {
+          if (o[key]) expect(String(o[key]), `${name} ${objName}.${key}`).not.toMatch(old);
+        }
+        for (const [fname, field] of Object.entries(o.fields ?? {})) {
+          const label = (field as any)?.label;
+          if (label) expect(String(label), `${name} ${objName}.fields.${fname}.label`).not.toMatch(old);
+        }
+      });
+    }
+  }
+});