ThreadManager 持有 Arc<ThreadManagerState> 統管所有 thread，spawn_thread() 統一處理新建/恢復/分叉/子代理四種啟動路徑；ForkSnapshot 定義 TruncateBeforeNthUserMessage/Interrupted 兩種語義；AgentControl 透過 Weak<ThreadManagerState> 避免循環引用；agent_graph_store 追蹤 ThreadSpawnEdgeStatus::Open/Closed。
The business post (order 28) of the Sandbox Series. Sandbox lifecycle management: pause/resume, snapshot/hibernation, resume concepts, implementation, and applicable scenarios for long-running tasks.
Claude Code writes every session line by line to a JSONL file under ~/.claude/projects/, kept for 30 days by default. This post breaks down --continue vs --resume, session naming rules, /branch fork semantics, and transcript export and cleanup settings.