test: volume_state_unknown 原因文案改为「下载目录读不到容量」后同步测试期望

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cxwgnn2pbzQ7rXv3rq7fei

packages/contracts/test/reasons.test.ts

@@ -20,7 +20,7 @@ describe("reasonText(DEAI-2 原因码人话化)", () => {
 
   it("智能体汇报里的码(FIX-7):能力错误、带分类前缀的空间判定、站点登录", () => {
     expect(reasonText("invalid_input")?.text).toBe("参数不对");
-    expect(reasonText("cache:volume_state_unknown")?.text).toBe("下载盘用量未知");
+    expect(reasonText("cache:volume_state_unknown")?.text).toBe("下载目录读不到容量");
     expect(reasonText("deferred:no_downloader_instance")?.text).toBe("没有可用的下载器");
     expect(reasonText("auth_missing")?.text).toContain("Cookie");
     expect(reasonText("unidentifiable")?.text).toBe("没识别出作品");