44019f229e
workbench.ts (stores): - applyTraceHydrationResult: activityLabel 只读 result.lastEventLabel,不读 events.at(-1) - lastEventLabel: 只读 result.lastEventLabel,不 fallback 到 events.at(-1) - normalizeTraceSnapshot: lastEventLabel 只读 source.lastEventLabel - mergeRunnerTrace: lastEventLabel 不从 events.at(-1) 推断 useTraceSubscription.ts: - lastEventLabel 只读 snapshot.lastEventLabel,不读 events.at(-1) trace-renderer.ts (CLI): - traceNoiseSummaryRow: status 只读 trace.status/traceStatus,不 fallback 到 lastEvent.status - 保持 lastLabel 用于展示,但不参与 lifecycle 推断 api/workbench.ts: - 添加注释标记 observedAt/lastEventAgeMs 为 diagnostic-only,不作用户可见相对时间权威 Closes #1750 Refs #1742