Starting another conversation could replace a busy local OpenCode server
after a brief health-check failure, leaving the existing conversation
reconnecting to a dead endpoint.
Keep active conversations and native Compact operations on their current
server. Propagate server exit and shutdown to bound requests and cancel
event-stream retry waits so failures are explicit instead of hanging.
Do not automatically replay commands.
Release note: 修复同时使用多个本机 OpenCode 会话时旧会话可能一直等待的问题。服务异常退出时会明确提示失败，不会自动重复执行命令。
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