Merge remote-tracking branch 'origin/master' into codex/fork-real-turn-tail
# Conflicts: # packages/client/runtime/README.i18n.yaml # packages/client/ui-conversation/README.i18n.yaml # packages/client/ui-conversation/src/client/chat/ChatView.tsx # packages/client/ui-conversation/src/client/chat/MessageIconActions.tsx
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kingwl
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# side as of the last confirmed-consistent state. Both languages carry equal authority;
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# after editing either side, bring the other along and re-record with:
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# pnpm run verify-translation-pairing --write .agents/notes/implemented/bug-fix/2026-08-02-message-fork-actions-require-completed-turn-tail.md
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2026-08-02-message-fork-actions-require-completed-turn-tail.md: 1f5ee6b7ff37709e07544f3e7c73ba1eee951f8d
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2026-08-02-message-fork-actions-require-completed-turn-tail.zh.md: ed897e9af56a601c8fc42379e3907e3551c6389e
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2026-08-02-message-fork-actions-require-completed-turn-tail.md: 38a81d9e6966b459ed8d7dd19ba0cbdd790b85b6
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2026-08-02-message-fork-actions-require-completed-turn-tail.zh.md: 09d2ecc2b110e66348b7cd7c5eb253b4c8cdbb9a
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@@ -10,7 +10,7 @@ The Web conversation attached branch to the last assistant node with nonempty te
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## Decision
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`ConversationSnapshot.turnEnds` retains the completed turn boundaries present in the raw event window. The conversation view walks transcript nodes through each boundary and exposes branch only when the boundary's last node is a user message or a content-bearing assistant message. Open turns have no eligible message, and a later tool result, reasoning-only interruption, turn error, or other transcript node suppresses branch on earlier messages. Copy and clock remain available under their existing message chrome, and the Host's completed-turn fork semantics remain unchanged.
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`ConversationSnapshot.turnEnds` retains the completed turn boundaries present in the raw event window. The conversation view walks transcript nodes through each boundary and exposes branch only when the boundary's last node is a user message, a durable steering message, or a content-bearing assistant message. Open turns have no eligible message, and a later tool result, reasoning-only interruption, turn error, or other transcript node suppresses branch on earlier messages. Copy and clock remain available under their existing message chrome, and the Host's completed-turn fork semantics remain unchanged.
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This narrows the message eligibility established by the earlier [Web session fork action decision](../feature/2026-07-27-web-session-fork-actions.md). Session-row forking still selects the latest completed turn, and eligible message actions still pass their event seq through the shared client runtime operation.
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@@ -24,4 +24,4 @@ This narrows the message eligibility established by the earlier [Web session for
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## Consequences
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A branch icon now denotes the same completed-turn boundary that the Host will copy. In the reported response → tool → interrupted Think shape, the response keeps copy and clock but no longer advertises branch. This change deliberately does not provide same-turn transcript editing or a retry-before-turn operation; the Session-row action remains available when a reader wants to copy the latest completed turn in full. Runtime tests pin boundary projection and reference stability, while conversation tests cover normal assistant tails, user-only tails, and suppression by later tool and interrupted reasoning rows.
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A branch icon now denotes the same completed-turn boundary that the Host will copy. In the reported response → tool → interrupted Think shape, the response keeps copy and clock but no longer advertises branch. This change deliberately does not provide same-turn transcript editing or a retry-before-turn operation; the Session-row action remains available when a reader wants to copy the latest completed turn in full. Runtime tests pin boundary projection and reference stability, while conversation tests cover assistant, user-only, and durable-steering tails plus suppression by later tool and interrupted reasoning rows.
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@@ -10,7 +10,7 @@ Web 会话把分支操作挂到每个轮次中最后一个文本非空的 assist
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## 决策
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`ConversationSnapshot.turnEnds` 保留原始事件窗口中的已完成轮次边界。会话视图按各边界遍历 transcript（文本记录）节点，仅当边界的最后一个节点是用户消息或含内容的 assistant 消息时才暴露分支操作。开放轮次没有符合条件的消息；如果后面还有工具结果、只有推理内容的中断、轮次错误或其他 transcript 节点，较早消息上的分支操作就会被抑制。复制和时钟仍可在既有消息 chrome 下使用，Host 按已完成轮次 fork 的语义保持不变。
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`ConversationSnapshot.turnEnds` 保留原始事件窗口中的已完成轮次边界。会话视图按各边界遍历 transcript（文本记录）节点，仅当边界的最后一个节点是用户消息、持久 steering（中途引导）消息或含内容的 assistant 消息时才暴露分支操作。开放轮次没有符合条件的消息；如果后面还有工具结果、只有推理内容的中断、轮次错误或其他 transcript 节点，较早消息上的分支操作就会被抑制。复制和时钟仍可在既有消息 chrome 下使用，Host 按已完成轮次 fork 的语义保持不变。
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本决策收紧了较早的 [Web 会话 fork 操作决策](../feature/2026-07-27-web-session-fork-actions.md)所定义的消息资格。Session 行 fork 仍选择最新的已完成轮次；符合条件的消息操作仍通过共享 client 运行时操作传递其事件 seq。
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**在点击的 assistant 消息处截断事件日志。** 不予采纳：assistant 消息可能位于尚未结束的步骤内，也可能包含结果随后才出现的工具调用。以该 seq 截取的原始前缀并不是结构完整的轮次，也可能不是有效的提供方 transcript。
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**从 `running` 或下一条用户消息推断完成状态。** 不予采纳：重试轮次与 steering（中途引导）轮次不一定和下一个可见用户气泡对齐，分页窗口也可能省略该气泡。持久 `turn/end` 事件才是权威的完成事实。
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**从 `running` 或下一条用户消息推断完成状态。** 不予采纳：重试轮次与 steering 轮次不一定和下一个可见用户气泡对齐，分页窗口也可能省略该气泡。持久 `turn/end` 事件才是权威的完成事实。
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**对每个被中断轮次隐藏分支。** 不予采纳：已中止的轮次会持久关闭，其最终的中断文本可能正是真正的 transcript 尾部。资格取决于已完成边界与节点顺序，而非结果类别。
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## 后果
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分支图标现在表示的已完成轮次边界与 Host 实际复制的边界一致。在所报告的「响应 → 工具 → 被中断的 Think」形态中，响应仍保留复制和时钟，但不再显示分支。本变更刻意不提供同轮次 transcript 编辑，也不提供轮次前重试操作；当读者希望完整复制最新的已完成轮次时，仍可使用 Session 行操作。运行时测试固定边界投影和引用稳定性，会话测试则覆盖普通 assistant 尾部、纯用户消息尾部，以及后续工具行和被中断推理行对分支操作的抑制。
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分支图标现在表示的已完成轮次边界与 Host 实际复制的边界一致。在所报告的「响应 → 工具 → 被中断的 Think」形态中，响应仍保留复制和时钟，但不再显示分支。本变更刻意不提供同轮次 transcript 编辑，也不提供轮次前重试操作；当读者希望完整复制最新的已完成轮次时，仍可使用 Session 行操作。运行时测试固定边界投影和引用稳定性，会话测试则覆盖 assistant 尾部、纯用户消息尾部、持久 steering 尾部，以及后续工具行和被中断推理行对分支操作的抑制。
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