AskaEth
19f296a2ab
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fix(gateway): 回合围栏堵住「中断后立刻发新消息被旧快照吞掉」的时序竞态（13.4.5 最新性）
- 根因（已确定性复现，非测试问题）：中断把会话立即置 idle ⇒ 紧随的新消息被当成空闲回合**立即开跑**，
而被取消回合的快照收尾在**它自己的 goroutine** 里、直到 Run 返回前才落定 ⇒ 新回合可能读到上一回合
中途留下的**可恢复**快照（stop_reason=tool_calls）并把调用方刚传进来的消息**整段替换**
（现场证据：DB 里 web:1(step=1,tool_calls) 与 web:2(step=2,stop) 并存，LoadLatest 选中 web:1；
把收尾窗口拉长到 300ms ⇒ 旧码 3/3 必红）
- 修法：新增 session_turn_fence.go —— 把「同一会话最多一个在途回合」从约定变成**可等待的围栏**：
新消息照旧被立即接受、Submit 立即返回（不阻塞硬约束不变），但其**回合启动**等上一回合真正返回
（那时被放弃的快照已落定）；等待同时盯本回合 ctx，不收敛的上一回合不会永久挂住会话
- 复核：整包 `go test ./internal/services/gateway/ -count=1` 绿（隔离副本 0/12）；`-shuffle=on` ×3 绿；
**全树 `go test ./... -count=1` = 58 包 ok / 0 FAIL**；变异两处（HEAD 原码跑新用例 3/3 红、拿掉等待即红）已还原；
交叉验证：单独打回 loop 的「只有 tool_calls 可恢复」改动后，新用例仍 3/3 红 ⇒ 两侧修法互补
- 顺带：A2 的 `ws_route.go` 一行（定向回 bad_request 需要发送者的 conn；hub 级无按连接寻址入口）
- 遗留（登记）：loop 侧 `checkpoint.go` 的恢复会整段替换调用方消息 ⇒ 建议加一致性判据（checkpoint 窗口
最后一条用户消息 ≠ 调用方最新消息则不恢复）；围栏未覆盖 orchestrator==nil 的 legacy 直连路径
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