test(release-cleanup): 補上結束碼、sanitizeBody 與 logger 輸出測試

新增子行程驗證 index.js 失敗時以非零狀態結束、fetchAllPages 錯誤訊息
清理控制字元與長度限制、以及 logger 各輸出函式格式與 stdout/stderr 分流測試。
測試共 56 項全數通過。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/test/main.test.js

@@ -1,5 +1,7 @@
 import { test, afterEach } from 'node:test'
 import assert from 'node:assert/strict'
+import { spawnSync } from 'node:child_process'
+import { fileURLToPath } from 'node:url'
 import { main } from '../index.js'
 
 const realFetch = globalThis.fetch
@@ -41,3 +43,14 @@ test('main 在必填環境變數缺失時 reject(供整合層級驗證錯誤處
   })
   await assert.rejects(() => main(), /GITEA_SERVER_URL is required/)
 })
+
+test('直接執行 index.js 在設定錯誤時以非零狀態碼結束', () => {
+  const indexPath = fileURLToPath(new URL('../index.js', import.meta.url))
+  // 僅帶 PATH,不提供任何必填環境變數,使 main 拋錯並觸發 process.exit(1)
+  const result = spawnSync(process.execPath, [indexPath], {
+    env: { PATH: process.env.PATH },
+    encoding: 'utf8',
+  })
+  assert.equal(result.status, 1)
+  assert.match(result.stderr, /GITEA_SERVER_URL is required/)
+})