fix(orchestrator): agent 节点收尾兼容 dsh-session 新 API，修「events is not iterable」 - #128
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…rable」 dsh-session 0.1.2-alpha.5（随今晨全局 dsh 0.1.2-alpha.4 升级引入）删除了 Session.events getter，只留 snapshotEvents() 方法。引擎 agent 节点收尾路径 （summarize/countTurns/sumUsage/buildTrace）与轮询看门狗仍裸访问 agent.session.events → undefined → for...of 抛「events is not iterable」， 节点结果整体被吞（无输出、无用量、纯错误串）。轮询 scanEvents 有 catch 静默，收尾路径无保护，故报错只在节点完成时出现。 - lib/index.js：新增 sessionEventsOf(session) 兼容读取——新 SDK 走 snapshotEvents()（try/catch 降级空数组），旧 SDK 回退 .events 数组， 异常形态（session 已释放）给空数组按「无事件」降级；替换全部 8 处 裸 .events 访问（scanEvents/看门狗/summarize×2/sumUsage/countTurns/ buildTrace/replayTrace 的 insp.events 加 Array.isArray 防御） - test/live-trace.test.mjs：新增 2 例——新旧 session 形态取值优先级、 异常形态降级不抛错 验证：orchestrator 30 套全绿（含 live-trace 8 例）、全量 npm test 通过。
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背景
用户报告正在运行的工作流中 agent 节点（3.1-交通停车沿革编制）跑完 112.3s 后报错
events is not iterable：无输出、无用量记录、纯错误串。根因
dsh-session 0.1.2-alpha.5（随今晨 01:54 全局 dsh 0.1.2-alpha.4 升级引入，已实测确认：0.1.0-rc.8 有
get events()，0.1.2-alpha.5 已删除，只留snapshotEvents()方法）删除了Session.eventsgetter。引擎 agent 节点多处裸访问
agent.session.events→ 新 SDK 下是undefined→for...of抛events is not iterable：scanEvents（index.js:1484）有 try/catch 静默——所以节点运行全程看似正常（进度流里轮数/预览全空但不报错）summarize（1599）第一个裸迭代即抛，节点结果（输出/用量/turns/trace）整体被吞——这正是用户看到的症状方案
sessionEventsOf(session)兼容读取：新 SDK 走snapshotEvents()（try/catch 降级空数组，覆盖 session 已释放形态），旧 SDK 回退.events数组；persistence.load回放的insp.events加Array.isArray防御.events访问（scanEvents/看门狗/summarize×2/sumUsage/countTurns/buildTrace/replayTrace）'(agent 无输出)'），不再吞掉整个节点验证
npm test通过运维说明
正在跑的工作流里已报错的节点需重跑（断点续跑即可）；dsh 进程须彻底重启后插件 HMR 才会加载新代码（
pkill -f 'dsh web'后重启）。