Merge remote-tracking branch 'origin/master' into worktree/replayable-gate-plans-20260727

.agents/notes/archived/architecture/2026-06-15-turn-enclosure-invariant.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write
-2026-06-15-turn-enclosure-invariant.md: 6e2abd1716f8efc08c06d5ff8faec38282f2a17f
-2026-06-15-turn-enclosure-invariant.zh.md: 0921c2574dc171e887664d8a2ea840a4e81f1531
+2026-06-15-turn-enclosure-invariant.md: f38f5b2600b57ad8f5fc4c8975579e281b5f3a49
+2026-06-15-turn-enclosure-invariant.zh.md: b74ddf3f6b65a7990329a8a903aafe2e4ca41c90

.agents/notes/archived/architecture/2026-06-15-turn-enclosure-invariant.md

@@ -1,6 +1,7 @@
 # Agent Note: Every session event is enclosed in a turn
 
 Status: implemented
+Archived: 2026-07-28
 
 English | [中文](2026-06-15-turn-enclosure-invariant.zh.md)
 

.agents/notes/archived/architecture/2026-06-15-turn-enclosure-invariant.zh.md

@@ -1,6 +1,7 @@
 # Agent Note: 每个会话事件都封闭在一个轮次内
 
 Status: implemented
+Archived: 2026-07-28
 
 [English](2026-06-15-turn-enclosure-invariant.md) | 中文
 

.agents/notes/archived/manifest.json

@@ -7,6 +7,9 @@
     "architecture/2026-06-11-tool-schemas-in-prompt-assembly.i18n.yaml": "sha256:37230a2f5b9dbe160b4f36b6906065637846261cbef380c3e2b777cf0d8e9013",
     "architecture/2026-06-11-tool-schemas-in-prompt-assembly.md": "sha256:6f7b7f15f53f857ccb8477b3fdf65bf2de3a6f96acd93049c03ce4aff1629538",
     "architecture/2026-06-11-tool-schemas-in-prompt-assembly.zh.md": "sha256:fd5ddfc53f8a1c4afa86599c858c2ad27858166e676754ee6e2ce0881f55cef7",
+    "architecture/2026-06-15-turn-enclosure-invariant.i18n.yaml": "sha256:7eb471a53b7bef104c57e9343b80d672763f062ecb086b01b318b65b488d3c02",
+    "architecture/2026-06-15-turn-enclosure-invariant.md": "sha256:afefa3a268c84f26cf5461e08933245352a9e63cff688d3c398c8064a4ac6e85",
+    "architecture/2026-06-15-turn-enclosure-invariant.zh.md": "sha256:c54fdac980abc922cdc252a8fef59e4bdd7567316c7fbb6f7dbc035e470d95fa",
     "architecture/2026-06-20-extract-example-app-packages.i18n.yaml": "sha256:d99b612cc1051c86d883d74737c72e921735e7a28e0b5e6351d3870c664bdcc4",
     "architecture/2026-06-20-extract-example-app-packages.md": "sha256:9c7aca3a1e9a1ccc3729961663bc649b90076e671cae23e3db8203305983ccce",
     "architecture/2026-06-20-extract-example-app-packages.zh.md": "sha256:19bd50232d9f25d35aa3f9dc72d9af0df457dd0eaca8b982d5aa625e5b95bcff",

.agents/notes/implemented/architecture/2026-07-24-separate-context-injection-from-turn-execution.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/architecture/2026-07-24-separate-context-injection-from-turn-execution.md
-2026-07-24-separate-context-injection-from-turn-execution.md: b74cd6bdc48e795e57d780ab31a907ffe94dd518
-2026-07-24-separate-context-injection-from-turn-execution.zh.md: f2421d2fc7b8c1329dd1349a6fb088407ac5fc75
+2026-07-24-separate-context-injection-from-turn-execution.md: d44ef5afc8c376790192998bcf3069ceb651ae82
+2026-07-24-separate-context-injection-from-turn-execution.zh.md: ba561b587effb278a67844ce4d876da9cd940e94

.agents/notes/implemented/architecture/2026-07-24-separate-context-injection-from-turn-execution.md

@@ -32,7 +32,7 @@ Outside that window, `inject()` appends its `user/message` immediately. It does
 
 If prompt admission blocks or fails, a caller-staged context-only batch appends immediately without a turn. Steering and context staged beside it remain in the outbox for a later admitted prompt; cancellation or disposal may discard them. Hook-produced `additionalContexts` never materialize because they belong to the rejected admission decision.
 
-The session invariant permits `user/message` between turns while continuing to require turn enclosure for execution events, steering, assistant output, tools, and package-added events by default. Persistence, recovery, resume, fork, and compaction treat a valid out-of-turn `user/message` as committed session history rather than an interrupted or discardable turn tail.
+The session invariant permits `user/message` between turns while continuing to require turn enclosure for core execution events, steering, assistant output, and tools. Merge-extensible event relations belong to their declaring plugin rather than a core default. Persistence, recovery, resume, fork, and compaction treat valid between-turn events as committed session history rather than an interrupted or discardable turn tail.
 
 ## Extension and caller semantics
 
@@ -42,7 +42,7 @@ Caller-driven injection and hook-produced additional context deliberately have d
 
 Cross-session references use that domain composition: TUI prepares the snapshot, then either adds it to the prompt's admission decision outside an acceptance window or injects it beside steering during one. The target log contains two simple messages, so later source mutation cannot change replay and transcript consumers do not need a prompt envelope. This supersedes the attachment mechanism in the [cross-session reference decision](../feature/2026-07-21-cross-session-references.md) while retaining its snapshot and trust-boundary rules.
 
-This decision preserves the caller-owned framing decision from [unwrapped injected content](../simplification/2026-07-20-unwrap-injected-content-envelopes.md), the one-item turn rule from [one send, one turn](../simplification/2026-07-17-one-send-one-turn.md), and narrows the [turn-enclosure decision](2026-06-15-turn-enclosure-invariant.md) so turns enclose execution rather than every session event.
+This decision preserves the caller-owned framing decision from [unwrapped injected content](../simplification/2026-07-20-unwrap-injected-content-envelopes.md) and the one-item turn rule from [one send, one turn](../simplification/2026-07-17-one-send-one-turn.md). The later [standalone log-only event decision](../simplification/2026-07-28-remove-synthetic-log-only-turns.md) applies the same execution-only meaning to plugin-owned records.
 
 ## Alternatives considered
 

.agents/notes/implemented/architecture/2026-07-24-separate-context-injection-from-turn-execution.zh.md

@@ -32,7 +32,7 @@ agent API 曾用三种相互重叠的方式表示面向模型的补充输入：
 
 如果提示词准入被阻止或失败，调用方暂存的仅含上下文的批次会立即追加，且不产生轮次。steering 及与其一同暂存的上下文会留在 outbox 中，供后续获准提示词使用；取消或 dispose（资源释放）可能丢弃它们。钩子产生的 `additionalContexts` 属于被拒绝的准入决策，因此永远不会落入日志。
 
-会话不变量允许 `user/message` 位于两个轮次之间，同时继续要求执行事件、steering、助手输出、工具事件以及默认的包扩展事件均受轮次边界约束。持久化、恢复、resume、fork 和压缩会把合法的轮次外 `user/message` 当作已提交会话历史，而不是中断轮次或可丢弃的日志尾部。
+会话不变量允许 `user/message` 位于两个轮次之间，同时继续要求核心执行事件、steering、助手输出和工具事件均受轮次边界约束。可合并扩展事件的关系由声明它们的插件拥有，而不是采用核心默认规则。持久化、恢复、resume、fork 和压缩会把合法的轮次间事件当作已提交会话历史，而不是中断轮次或可丢弃的日志尾部。
 
 ## 扩展点与调用方语义
 
@@ -42,7 +42,7 @@ agent API 曾用三种相互重叠的方式表示面向模型的补充输入：
 
 跨会话引用采用这种领域组合方式：TUI 先准备快照，然后在接受窗口之外将其加入提示词准入决策，或在窗口期间将其注入到 steering 旁。目标日志包含两条简单消息，因此来源会话后续变化不会改变回放，transcript 消费方也不需要提示词封套。本决策取代[跨会话引用决策](../feature/2026-07-21-cross-session-references.md)中的附件机制，但保留其快照与信任边界规则。
 
-本决策保留[移除注入内容封套](../simplification/2026-07-20-unwrap-injected-content-envelopes.md)确立的调用方自主管理框架原则，以及[一次 send、一个轮次](../simplification/2026-07-17-one-send-one-turn.md)确立的单条目轮次规则；同时收窄[轮次封闭决策](2026-06-15-turn-enclosure-invariant.md)，使轮次约束执行过程，而不是约束所有会话事件。
+本决策保留[移除注入内容封套](../simplification/2026-07-20-unwrap-injected-content-envelopes.md)确立的调用方自主管理框架原则，以及[一次 send、一个轮次](../simplification/2026-07-17-one-send-one-turn.md)确立的单条目轮次规则。后续的[独立纯日志事件决策](../simplification/2026-07-28-remove-synthetic-log-only-turns.md)将同样的「轮次仅表示执行」语义应用于插件所属记录。
 
 ## 曾考虑的替代方案
 

.agents/notes/implemented/feature/2026-06-30-hook-protocol-lib.i18n.yaml

@@ -1,6 +1,6 @@
 # Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
-#   pnpm run verify-translation-pairing --write
-2026-06-30-hook-protocol-lib.md: 19a69119befde99417b736edf38923ec6ac5fa7c
-2026-06-30-hook-protocol-lib.zh.md: f4950eea2b02e86ed7109f8ebdaab29dd77428d8
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-06-30-hook-protocol-lib.md
+2026-06-30-hook-protocol-lib.md: 33ec23dd4fa6aa8b4966bbe6c0ca5697ec83056c
+2026-06-30-hook-protocol-lib.zh.md: 8e8c89a4ecca3bea98fb26bc55974765f27f6a11

.agents/notes/implemented/feature/2026-06-30-hook-protocol-lib.md

@@ -19,7 +19,7 @@ A new `packages/hooks/` group with `hook-protocol` as a pure library. It owns fo
 - **Execution** — `runHook(bash, hook, options)`. Runs a command hook through the `ctx.bash` seam rather than a bespoke `spawn`: the executor already provides the scrubbed-but-overridable env, process-group kills, and timeout the protocol needs, and `dsh-bash`'s `stdin`/`env` fields (added for exactly this) are the trusted-plugin surface an in-process bridge is allowed to use. It serializes the bridge-built payload to stdin (trailing newline iff CC), honors the hook's `timeoutSec` (else `DEFAULT_HOOK_TIMEOUT_MS`, the 10-minute reference default both dialects share), and never throws (an executor rejection becomes a non-blocking-error `HookOutput`).
 - **Decode** — `parseHookOutput(exit, stdout, stderr)`, the exit-code + structured-stdout codec, producing a dialect-neutral `HookOutput`. Exit `0` → lenient JSON parse of stdout; exit `2` → blocking error with `stderr` as the reason (surfaced as `decision: 'block'` so no caller needs a separate exit-code branch); other → non-blocking error. Parses the CC structured-stdout fields that have a consumer on some path (`continue`/`stopReason`/`decision`/`hookSpecificOutput.{permissionDecision,additionalContext,updatedInput}`/`systemMessage`); the bridge honors only the subset meaningful for its dialect. Fields with no consumer on any path are not parsed at all (CC's `suppressOutput` — hook stdout never enters a transcript here, so there is nothing to suppress; see [the tighten-hook-protocol-contract Agent Note](../simplification/2026-07-04-tighten-hook-protocol-contract.md)).
 - **Merge** — `mergeHookOutputs(outputs)`, folding multiple matched hooks into one most-restrictive `MergedHookOutcome`: permission precedence **deny > ask > allow**, halt sticky on the first `continue:false`, block reasons joined `\n\n`, context/system-messages accumulated in order.
-- **`hook/*` session events** — `hook/invoked` / `hook/result`, declaration-merged into `SessionEventMap` (log-only, like `compact/*` — NOT `SurfaceEventType`s), with `appendHookInvoked`/`appendHookResult` helpers so the invoked/result pairing and turn-enclosure stay consistent across bridges. `appendHookResult` also owns the durable record's semantics — the decision string (the hook's parsed decision, else `'stop'` on `continue:false`, else `'pass'`) and the 500-character `stderrSummary` truncation derive from the `HookOutput` here, not per-bridge.
+- **`hook/*` session events** — `hook/invoked` / `hook/result`, declaration-merged into `SessionEventMap` (log-only, like `compact/*` — NOT `SurfaceEventType`s), with `appendHookInvoked`/`appendHookResult` helpers so the invoked/result pairing and owner-defined execution relation stay consistent across bridges. `appendHookResult` also owns the durable record's semantics — the decision string (the hook's parsed decision, else `'stop'` on `continue:false`, else `'pass'`) and the 500-character `stderrSummary` truncation derive from the `HookOutput` here, not per-bridge.
 
 **Per-dialect (the bridge plugins):** building each event's stdin payload (CC's base+per-event field sets vs Codex's snake_case with `turn_id`/`model` extras), the dialect's env + `${CLAUDE_PLUGIN_ROOT}` substitution (CC) vs none (Codex), and mapping the neutral `HookOutput`/`MergedHookOutcome` onto the harness's seam-specific typed Decisions (`PreToolDecision`, `PromptDecision`, `ContinuationDecision`, `PostToolDecision`).
 

.agents/notes/implemented/feature/2026-06-30-hook-protocol-lib.zh.md

@@ -19,7 +19,7 @@ Status: implemented
 - **执行** — `runHook(bash, hook, options)`。通过 `ctx.bash` seam 而非自建 `spawn` 运行命令钩子：执行器已提供清洗但可覆盖的 env、进程组 kill 和超时，正是协议所需的能力；`dsh-bash` 的 `stdin`/`env` 字段（正是为此添加的）是进程内桥接插件被允许使用的受信插件接口。它将桥接插件构建的 payload 序列化到 stdin（CC 时追加尾部换行），遵守钩子的 `timeoutSec`（否则使用 `DEFAULT_HOOK_TIMEOUT_MS`，即两种方言共享的 10 分钟参考默认值），且从不抛异常（执行器拒绝变为 non-blocking-error 的 `HookOutput`）。
 - **解码** — `parseHookOutput(exit, stdout, stderr)`，exit-code + structured-stdout 编解码器，产出方言无关的 `HookOutput`。Exit `0` → 宽松 JSON 解析 stdout；exit `2` → blocking error，`stderr` 为原因（以 `decision: 'block'` 呈现，调用方无需单独处理 exit-code 分支）；其他 → non-blocking error。解析 CC structured-stdout 中在某条路径上有消费方的字段（`continue`/`stopReason`/`decision`/`hookSpecificOutput.{permissionDecision,additionalContext,updatedInput}`/`systemMessage`）；桥接插件只采纳对其方言有意义的子集。在任何路径上都没有消费方的字段不予解析（CC 的 `suppressOutput`——钩子 stdout 在此处从不进入 transcript（文本记录），因此无需抑制；见 [收紧钩子协议契约 Agent Note](../simplification/2026-07-04-tighten-hook-protocol-contract.md)）。
 - **合并** — `mergeHookOutputs(outputs)`，将多个匹配钩子的输出折叠为一个最严格的 `MergedHookOutcome`：权限优先级 **deny > ask > allow**，halt 在首个 `continue:false` 时粘滞，阻止原因以 `\n\n` 拼接，context/system-messages 按序累积。
-- **`hook/*` 会话事件** — `hook/invoked` / `hook/result`，通过声明合并进入 `SessionEventMap`（仅日志，如 `compact/*`——不是 `SurfaceEventType`），配有 `appendHookInvoked`/`appendHookResult` 辅助函数，确保 invoked/result 配对与轮次包含关系在各桥接插件间保持一致。`appendHookResult` 还拥有持久化记录的语义：decision 字符串（钩子解析出的 decision，否则 `continue:false` 时为 `'stop'`，否则为 `'pass'`）和 500 字符的 `stderrSummary` 截断均从本库的 `HookOutput` 派生，而非各桥接插件各自实现。
+- **`hook/*` 会话事件** — `hook/invoked` / `hook/result`，通过声明合并进入 `SessionEventMap`（仅日志，如 `compact/*`——不是 `SurfaceEventType`），配有 `appendHookInvoked`/`appendHookResult` 辅助函数，确保 invoked/result 配对与由所有方定义的执行关系在各桥接插件间保持一致。`appendHookResult` 还拥有持久化记录的语义：decision 字符串（钩子解析出的 decision，否则 `continue:false` 时为 `'stop'`，否则为 `'pass'`）和 500 字符的 `stderrSummary` 截断均从本库的 `HookOutput` 派生，而非各桥接插件各自实现。
 
 **方言专属（桥接插件）：** 构建每个事件的 stdin payload（CC 的 base+per-event 字段集 vs Codex 的 snake_case 加 `turn_id`/`model` 额外字段）、方言的 env 与 `${CLAUDE_PLUGIN_ROOT}` 替换（CC）vs 无替换（Codex），以及将方言无关的 `HookOutput`/`MergedHookOutcome` 映射为 harness seam 专属的类型化 Decision（`PreToolDecision`、`PromptDecision`、`ContinuationDecision`、`PostToolDecision`）。
 

.agents/notes/implemented/feature/2026-06-30-session-store-fork-api.i18n.yaml

@@ -1,6 +1,6 @@
 # Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
-#   pnpm run verify-translation-pairing --write
-2026-06-30-session-store-fork-api.md: 13d411e915b2e34b15a12e632f1a5e047f4aeedc
-2026-06-30-session-store-fork-api.zh.md: bcf15eb581af3993ed2d71a2b7dc604faa6e4433
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-06-30-session-store-fork-api.md
+2026-06-30-session-store-fork-api.md: 5342deba8ca879026d32ee1420cb3c0fdf67c500
+2026-06-30-session-store-fork-api.zh.md: 51a3e0ce50aff10a9812c91d24dc6e78a56c43ba

.agents/notes/implemented/feature/2026-06-30-session-store-fork-api.md

@@ -8,7 +8,7 @@ English | [中文](2026-06-30-session-store-fork-api.zh.md)
 
 The event-sourced session log already has the primitive a fork needs: create a new session with a seed event prefix, then derive model history from that seeded log exactly as replay does. That primitive is intentionally low-level: `ctx.sessions.create(id, { seed, meta })` accepts any valid seed, but ordinary live-session branching needs policy around which prefix can be copied, which metadata is stamped on the child, and how errors are classified.
 
-The semantic hazard is the fork boundary. A valid user-visible fork seed must be contiguous and turn-enclosed. Forking inside an active turn would copy an open `turn/start`, possibly an open `step/start`, and possibly dangling tool calls. That violates turn-enclosure and provider-transcript invariants, and it creates a misleading child history that appears to have participated in an unfinished parent turn. The existing [subagent seam](2026-06-21-subagent-capability-seam.md) deliberately solves a different problem: tool-triggered subagent forks usually happen while the parent turn is open, so `dsh-subagent-fork` clips the seed to the parent's last completed-turn prefix. A general session fork should not silently clip; it should either fork the requested boundary or reject it.
+The semantic hazard is the fork boundary. A valid user-visible fork seed must be contiguous and end outside an active turn. Forking inside execution would copy an open `turn/start`, possibly an open `step/start`, and possibly dangling tool calls. That violates execution and provider-transcript invariants, and it creates a misleading child history that appears to have participated in an unfinished parent turn. Standalone context and plugin-owned log-only events are stable forkable history after a closed turn. The existing [subagent seam](2026-06-21-subagent-capability-seam.md) deliberately solves a different problem: tool-triggered subagent forks usually happen while the parent turn is open, so `dsh-subagent-fork` clips the seed to the parent's last completed-turn prefix. A general session fork should not silently clip; it should either fork the requested boundary or reject it.
 
 ## Decision
 
@@ -24,9 +24,9 @@ class SessionStore extends Service {
 }
 ```
 
-`boundary` is the inclusive source event `seq` to copy through. When omitted, it defaults to the source session's current last event; on an empty source, omitted `boundary` creates an empty child. Fork-specific validation only checks that the requested boundary exists and is a `turn/end`. The selected prefix is then deep-cloned into the child seed. The child inherits the source session's `cwd`, stamps `parentSession` to the source id, and sets `seedLength` to the copied prefix length. When `childSessionId` is omitted, `SessionStore` generates one using its existing id policy.
+`boundary` is the inclusive source event `seq` to copy through. When omitted, it defaults to the source session's current last event; on an empty source, omitted `boundary` creates an empty child. Fork-specific validation checks that the requested boundary exists and that the selected prefix's latest turn boundary is not an unmatched `turn/start`. The selected prefix may therefore end at `turn/end` or at a later standalone event, then is deep-cloned into the child seed. The child inherits the source session's `cwd`, stamps `parentSession` to the source id, and sets `seedLength` to the copied prefix length. When `childSessionId` is omitted, `SessionStore` generates one using its existing id policy.
 
-An empty prefix is forkable; any non-empty boundary must be a safe existing sequence at `turn/end`, regardless of reason. Typed errors distinguish missing sources, stale objects, duplicate child ids, and invalid boundaries. Broader log validation and crash repair remain with their existing owners.
+An empty prefix is forkable; any non-empty boundary must be a safe existing sequence outside an open turn. Typed errors distinguish missing sources, stale objects, duplicate child ids, invalid boundaries, and prefixes ending during execution. Broader log validation and crash repair remain with their existing owners.
 
 ## Alternatives considered
 

.agents/notes/implemented/feature/2026-06-30-session-store-fork-api.zh.md

@@ -8,7 +8,7 @@ Status: implemented
 
 事件溯源的会话日志已经具备 fork 所需的原语：创建一个带有种子事件前缀的新会话，然后像回放一样从该种子日志推导模型历史。这个原语有意保持底层：`ctx.sessions.create(id, { seed, meta })` 接受任何合法种子，但常规的活跃会话分支需要围绕以下问题制定策略：哪些前缀可以被复制、子会话应打上哪些元数据、以及错误如何分类。
 
-语义上的风险在于 fork 边界。一个合法的用户可见 fork 种子必须是连续的且封闭在轮次内。如果在一个活跃轮次内部 fork，会复制一个未关闭的 `turn/start`、可能还有一个未关闭的 `step/start`，以及可能悬空的工具调用。这违反了轮次封闭性与提供方 transcript 不变式，并且会创建一段误导性的子历史——看起来子会话参与了父会话中一个尚未完成的轮次。现有的 [subagent seam](2026-06-21-subagent-capability-seam.md) 有意解决的是另一个问题：工具触发的 subagent fork 通常发生在父轮次仍然打开时，因此 `dsh-subagent-fork` 会将种子裁剪到父会话最后一个已完成轮次的前缀。通用的会话 fork 不应静默裁剪；它应当要么在请求的边界处 fork，要么拒绝请求。
+语义上的风险在于 fork 边界。一个合法的用户可见 fork 种子必须连续，并在活跃轮次之外结束。如果在执行过程中 fork，会复制一个未关闭的 `turn/start`、可能还有一个未关闭的 `step/start`，以及可能悬空的工具调用。这违反了执行与提供方 transcript 不变式，并且会创建一段误导性的子历史——看起来子会话参与了父会话中一个尚未完成的轮次。已关闭轮次之后的独立上下文和插件所属纯日志事件是稳定且可 fork 的历史。现有的 [subagent seam](2026-06-21-subagent-capability-seam.md) 有意解决的是另一个问题：工具触发的 subagent fork 通常发生在父轮次仍然打开时，因此 `dsh-subagent-fork` 会将种子裁剪到父会话最后一个已完成轮次的前缀。通用的会话 fork 不应静默裁剪；它应当要么在请求的边界处 fork，要么拒绝请求。
 
 ## 决策
 
@@ -24,9 +24,9 @@ class SessionStore extends Service {
 }
 ```
 
-`boundary` 是要复制到的源事件 `seq`（含该序号）。省略时默认为源会话当前的最后一个事件；对空源会话省略 `boundary` 则创建一个空的子会话。fork 特有的校验仅检查请求的边界是否存在且为 `turn/end`。选定的前缀随后被深拷贝到子会话的种子中。子会话继承源会话的 `cwd`，将 `parentSession` 设为源会话 id，并将 `seedLength` 设为已复制前缀的长度。省略 `childSessionId` 时，`SessionStore` 使用其现有的 id 策略生成一个。
+`boundary` 是要复制到的源事件 `seq`（含该序号）。省略时默认为源会话当前的最后一个事件；对空源会话省略 `boundary` 则创建一个空的子会话。fork 特有的校验会检查请求的边界存在，并确认所选前缀最近的轮次边界不是未匹配的 `turn/start`。因此，所选前缀可以结束于 `turn/end` 或更晚的独立事件，随后被深拷贝到子会话的种子中。子会话继承源会话的 `cwd`，将 `parentSession` 设为源会话 id，并将 `seedLength` 设为已复制前缀的长度。省略 `childSessionId` 时，`SessionStore` 使用其现有的 id 策略生成一个。
 
-空前缀可以被 fork；任何非空边界都必须是一个安全的、已存在的、位于 `turn/end` 的序号，无论结束原因为何。类型化的错误区分源缺失、对象陈旧、子 id 重复和边界无效等情况。更广泛的日志校验与崩溃恢复仍由其现有的负责方处理。
+空前缀可以被 fork；任何非空边界都必须是位于开放轮次之外且安全、已存在的序号。类型化的错误区分源缺失、对象陈旧、子 id 重复、边界无效和前缀结束于执行过程中等情况。更广泛的日志校验与崩溃恢复仍由其现有的负责方处理。
 
 ## 曾考虑的替代方案
 

.agents/notes/implemented/feature/2026-07-06-sandbox.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-07-06-sandbox.md
-2026-07-06-sandbox.md: b9c410e4498a565a7414085fddfb74856592da66
-2026-07-06-sandbox.zh.md: 876870a12f1205b4f2cc2c8c13b5e7ec815a1569
+2026-07-06-sandbox.md: c3c61ed4539bcbca359f84f3dcc020e0bd41ae79
+2026-07-06-sandbox.zh.md: 39bf92aa20c697d2ad5f4c0926caeff0a0b60a1d

.agents/notes/implemented/feature/2026-07-06-sandbox.md

@@ -202,5 +202,5 @@ In-repo precedents this design copies or contrasts with:
 - [The capability-seams Agent Note](../architecture/2026-06-13-capability-seams.md) — the interface/implementation/consumer split and the "don't split preemptively" timing rule the second consumer satisfied.
 - The `dsh-bash` request/spec split ([the bash vocabulary catalog](../../../../docs/core-data-structures/bash.md)) — the complete `sandboxPolicy` rides its per-call carrier, and the explicit-`resolve()` defaulting convention.
 - [The approval seam Agent Note](2026-07-06-approval-seam.md) — the channel escalation asks through; its answerer waterfall, audit pair, and one-package rationale are recorded there.
-- [Event-sourced sessions](../architecture/2026-06-11-event-sourced-sessions.md) and [the turn-enclosure invariant](../architecture/2026-06-15-turn-enclosure-invariant.md) — the log-as-store foundation the per-session modes fold over, and the commit boundary the anchoring design obeys.
+- [Event-sourced sessions](../architecture/2026-06-11-event-sourced-sessions.md) and [standalone log-only events](../simplification/2026-07-28-remove-synthetic-log-only-turns.md) — the log-as-store foundation the per-session modes fold over, and the explicit durability boundary the anchoring design obeys.
 - [The interception-seams Agent Note](2026-06-30-interception-seams.md) — the `tools/pre-execute` vocabulary the escalation gate deliberately does not reuse (an escalating call has no pre-execute moment of its own).

.agents/notes/implemented/feature/2026-07-06-sandbox.zh.md

@@ -202,5 +202,5 @@ fs/web/todo 在进程内执行，因此它们的沙箱语义是各自 seam 层
 - [能力 seam Agent Note](../architecture/2026-06-13-capability-seams.md)——接口/实现/消费方拆分与「不要过早拆分」的时机规则（第二个消费方满足了该规则）。
 - `dsh-bash` 的 request/spec 拆分（[bash 词汇目录](../../../../docs/core-data-structures/bash.md)）——完整的 `sandboxPolicy` 搭载其按调用载体，以及显式 `resolve()` 默认约定。
 - [批准 seam Agent Note](2026-07-06-approval-seam.md)——升级请求通过的通道；其应答器 waterfall（瀑布式事件）、审计对和单包理由记录在那里。
-- [事件溯源会话](../architecture/2026-06-11-event-sourced-sessions.md)与[轮次封闭不变式](../architecture/2026-06-15-turn-enclosure-invariant.md)——按会话模式 fold 所依赖的日志即存储基础，以及锚定设计遵守的提交边界。
+- [事件溯源会话](../architecture/2026-06-11-event-sourced-sessions.md)与[独立纯日志事件](../simplification/2026-07-28-remove-synthetic-log-only-turns.md)——按会话模式 fold 所依赖的日志即存储基础，以及锚定设计遵守的显式持久性边界。
 - [拦截 seam Agent Note](2026-06-30-interception-seams.md)——`tools/pre-execute` 词汇，升级门控刻意不复用它（升级调用没有自己的 pre-execute 时刻）。

.agents/notes/implemented/feature/2026-07-21-log-backed-session-titles.i18n.yaml

@@ -1,6 +1,6 @@
 # Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
-#   pnpm run verify-translation-pairing --write
-2026-07-21-log-backed-session-titles.md: 4cf238a278a4eec7b894a0fcfb0f2ac464325bb0
-2026-07-21-log-backed-session-titles.zh.md: 933cc14eb245581c128cb18055df726174f953ec
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-07-21-log-backed-session-titles.md
+2026-07-21-log-backed-session-titles.md: 1bd58e35ec625fb0b04c0c119ce425ff30a64881
+2026-07-21-log-backed-session-titles.zh.md: 37ec95efbca334f71d19d2bc3e18c22d50d9b5fb

.agents/notes/implemented/feature/2026-07-21-log-backed-session-titles.md

@@ -8,7 +8,7 @@ English | [中文](2026-07-21-log-backed-session-titles.zh.md)
 
 A session needs a short human-facing title before an editor, terminal, or query consumer can present it usefully. The cheapest implementation can derive one from the first prompt, while higher-quality implementations may call a model over the first prompt or the whole conversation. Those strategies have different latency, cost, routing, and retry behavior, but every consumer needs one durable source of truth.
 
-Session identity metadata is immutable, the event log is the replay and fork boundary, and every event must remain turn-enclosed. A model-generated title often finishes after the main turn closes, so writing it synchronously would delay the agent response while writing it as mutable metadata would bypass ordinary persistence, replay, and lineage semantics. Concurrent prompts, provider HMR, cancellation, and ignored abort signals also make an unfenced background result capable of overwriting a newer title.
+Session identity metadata is immutable, and the event log is the replay and fork boundary. A model-generated title often finishes after the main turn closes, so writing it synchronously would delay the agent response while writing it as mutable metadata would bypass ordinary persistence, replay, and lineage semantics. Concurrent prompts, provider HMR, cancellation, and ignored abort signals also make an unfenced background result capable of overwriting a newer title.
 
 ## Decision
 
@@ -18,13 +18,13 @@ The [`session-title` capability family](../../../../packages/session-title/READM
 
 Every accepted revision is a log-only `session/title` event. Its payload contains normalized non-empty text, the exact eligible human `user/message` seqs used to derive it, and either fallback provenance or the registered provider id plus optional provider/model route. Before an auxiliary title-model dispatch, the shared helper appends a log-only `session/title-llm-request` event containing the title-provider id, exact source seqs, route, system prompt, messages, and output-token cap; a later generation failure leaves the request auditable. The dispatched envelope is deep-frozen to preserve exact agreement with that record but carries no process-local agent-loop request identity, so loop-only reconstruction checks do not compare it with the main conversation header. Validation failures that never reach dispatch create no request event. `foldSessionTitle()` selects the latest title event and adds that event's seq and timestamp as `SessionTitleSnapshot`. Neither event enters `session.surface` or `deriveMessages()`.
 
-The core session package exposes `ctx.sessions.appendOutOfBand()` only for plugin event types whose owners also declaration-merge an `OutOfBandSessionEventMap` marker. An open turn receives the log-only event directly and owns its normal checkpoint. A closed log receives `turn/start → event → turn/end` under the plugin's trigger, followed by an awaited flush. Once the synthetic turn opens, target-append failure still attempts to close and flush it; detach is deferred until the sequence settles. Session titles contribute the source-free `session-title` zero-step trigger and opt both title event types into this seam. No message caused that trigger, so consumers of the merge-extensible `TurnTriggerMap` discriminate `kind` before reading variant fields; goal-round admission, for example, ignores every non-`message` trigger.
+The title service appends `session/title` directly after checking its current revision and exact live session; the bundled model helper likewise appends its literal `session/title-llm-request` record before dispatch. Both records may sit between turns without inventing an execution boundary. Persistence observes them eagerly and drains through ordinary checkpoints and lifecycle teardown; title publication does not force a per-event flush. No generic marker, cast, or settlement queue sits between the event owner and `Session.append()`. This is the domain-specific application of the [standalone log-only event decision](../simplification/2026-07-28-remove-synthetic-log-only-turns.md).
 
 ### Input and asynchronous timing
 
 Only text blocks from human-source `user/message` events are eligible. Empty, control-only, and non-text prompts wait for the next eligible message. The service schedules the first fallback without awaiting it from the prompt path, normalizes whitespace and control sequences, applies the configured word and UTF-8 byte limits without splitting a code point, and records the first message seq.
 
-Automatic provider work starts only after the main loop has a current logged provider/model route. A newly appended `request/header` starts pending work directly; when the header is unchanged, the marked loop-built `llm/stream` request starts it after matching the folded route. Generation then runs independently of the agent response, and a completion joins whichever turn is open at acceptance time or uses the zero-step append path. Explicit `refresh(session, signal?)` materializes any missing fallback and awaits the registered provider; without a provider it returns the fallback. Caller cancellation during fallback flush does not roll back the durable append, but `refresh()` rechecks the signal and rejects instead of returning success. Concurrent refreshes reserve their session-local revision before waiting for fallback durability, so a newer call supersedes an older call before either can invert provider completion order. Automatic work and concurrent refreshes share one session-local in-flight fallback promise, so the first fallback creates only one title event and zero-step turn. All title-capability out-of-band writes share a per-session settlement queue; a replacement model request waits for any earlier title write, while the superseded model call itself remains independently abortable and cannot commit stale output. A title accepted during asynchronous compaction remains log-only, so the compactor's post-summary surface-node check tolerates it; a concurrent surface mutation still invalidates the replacement.
+Automatic provider work starts only after the main loop has a current logged provider/model route. A newly appended `request/header` starts pending work directly; when the header is unchanged, the marked loop-built `llm/stream` request starts it after matching the folded route. Generation then runs independently of the agent response, and a completion appends a standalone event without changing turn state. Explicit `refresh(session, signal?)` materializes any missing fallback and awaits the registered provider; without a provider it returns the fallback. Caller cancellation does not roll back an already accepted fallback event, and `refresh()` rechecks the signal before returning success. Concurrent refreshes reserve their session-local revision before provider work, so a newer call aborts and supersedes an older call before either can invert provider completion order. Automatic work and concurrent refreshes share one session-local in-flight fallback promise, so the first fallback creates only one title event. A title accepted during asynchronous compaction remains log-only, so the compactor's post-summary surface-node check tolerates it; a concurrent surface mutation still invalidates the replacement.
 
 The first-message provider schedules once when a fresh session first creates its fallback. An automatic failure does not reschedule on later prompts; `refresh()` is the retry path. The all-messages provider schedules after every eligible human prompt and passes all eligible messages through that revision, including seeded history. Its newer revision aborts and supersedes older pending or active work.
 
@@ -34,13 +34,13 @@ The first-message provider schedules once when a fresh session first creates its
 
 Model providers require explicit word, CJK-character, input-byte, output-token, and timeout limits. Optional `provider` and `model` overrides are a pair; without them the helper uses the exact route from the logged main request header. Selected messages are framed as JSON under one fixed language-aware instruction. The dispatched `GenerateOptions` carries `purpose: 'session-title'`; the DeepSeek adapter maps that purpose to thinking-disabled and omits reasoning effort so the bounded output is visible title text, while the main conversation keeps its configured thinking mode. The input limit measures the final user prompt, including wrappers, seq fields, and JSON escaping, before the request is logged or dispatched. Oversized input is rejected rather than truncated because truncation would make the recorded source seqs falsely imply complete use. The fused deadline is checked while consuming each stream chunk and after completion, so a successful result returned after timeout cannot be accepted even when an interceptor or adapter ignores abort.
 
-Automatic provider failures are nonfatal warnings and retain the latest title. Explicit refresh failures reject to the caller. Output must be non-empty text with unique ordered seqs drawn from the fixed request; the service normalizes and byte-limits it before durable acceptance.
+Automatic provider failures are nonfatal warnings and retain the latest title. Explicit refresh failures reject to the caller. Output must be non-empty text with unique ordered seqs drawn from the fixed request; the service normalizes and byte-limits it before log acceptance.
 
 ### Forks and consumers
 
 A fork inherits seed title events unchanged, like the rest of its source log. The first-message provider does not automatically retitle a fork. The all-messages provider may append a child-owned revision after a later child prompt, using inherited and new eligible messages.
 
-`ctx.sessionQuery.readTitle()` folds one live-preferred or persisted log without loading titles during `listSessions()`. The TUI uses the latest title as its header subtitle and sets the terminal window title to `<session title> — <configured product title>` after terminal-safe rendering. The Web host folds the same log state into a validated mux control frame after each attached-session subscription baseline and immediately after forwarding a live raw title event. The browser retains only newer title event seqs even when the control frame precedes list or session-instance creation; sidebar labels, search, breadcrumbs, and the browser title then react to the projected revision. `session.list` remains metadata-only, so a cold persisted session uses the cwd basename or id until opening or resuming it attaches the log. The browser title uses `<session title> — <existing HTML title>` only for a selected titled session and otherwise preserves the product title. A synthetic title turn remains a completed durability boundary for the metadata write; consumers reporting agent completion use the core `findLastMessageTurnEnd()` fold so a later title, injection, or other plugin-owned turn cannot replace the preceding message-triggered outcome.
+`ctx.sessionQuery.readTitle()` folds one live-preferred or persisted log without loading titles during `listSessions()`. The TUI uses the latest title as its header subtitle and sets the terminal window title to `<session title> — <configured product title>` after terminal-safe rendering. The Web host folds the same log state into a validated mux control frame after each attached-session subscription baseline and immediately after forwarding a live raw title event. The browser retains only newer title event seqs even when the control frame precedes list or session-instance creation; sidebar labels, search, breadcrumbs, and the browser title then react to the projected revision. `session.list` remains metadata-only, so a cold persisted session uses the cwd basename or id until opening or resuming it attaches the log. The browser title uses `<session title> — <existing HTML title>` only for a selected titled session and otherwise preserves the product title. Consumers reporting agent completion use the core `findLastMessageTurnEnd()` fold, so a later between-turn title record cannot replace the preceding message-triggered outcome.
 
 ## Alternatives considered
 
@@ -57,6 +57,6 @@ A fork inherits seed title events unchanged, like the rest of its source log. Th
 - Titles survive JSONL and SQLite persistence, replay, and fork inheritance without a separate mutable record.
 - Web title delivery stays incremental and log-backed without a title index or persisted-list scan; cold list rows improve after attach.
 - A fallback appears immediately. Each fresh Web session adds one first-message auxiliary call; other compositions choose whether better titles justify model cost and whether later prompts should retitle a session.
-- Auxiliary request records and late accepted titles consume event seqs and may create balanced zero-step turns, so persistence exposes both attempted dispatches and accepted updates even though model history and KV-cache identity do not change.
+- Auxiliary request records and late accepted titles consume event seqs without consuming turn numbers, so persistence exposes both attempted dispatches and accepted updates even though model history and KV-cache identity do not change.
 - One provider and monotonic per-session revisions make disposal, supersession, and stale-result rejection explicit, at the cost of leaving multi-strategy precedence to a composite provider.
 - Manual rename, deletion, generated-versus-user precedence, search, and list indexing remain outside the capability.

.agents/notes/implemented/feature/2026-07-21-log-backed-session-titles.zh.md

@@ -8,7 +8,7 @@ Status: implemented
 
 会话需要一个面向用户的简短标题，编辑器、终端或查询消费方才能有效呈现它。成本最低的实现可以从第一条提示词派生标题，质量更高的实现则可以让模型处理第一条提示词或整个对话。这些策略在延迟、成本、路由和重试行为上各有不同，但所有消费方都需要一个持久的真源。
 
-会话身份元数据不可变，事件日志是回放和 fork 的边界，而且每个事件都必须包围在轮次内。模型生成的标题往往在主轮次结束后才完成，因此同步写入会延迟 agent（智能体）响应，而作为可变元数据写入则会绕过常规的持久化、回放和沿袭语义。并发提示词、提供方 HMR（热模块替换）、取消以及被忽略的中止信号，还可能让未受版本校验约束的后台结果覆盖更新的标题。
+会话身份元数据不可变，事件日志是回放和 fork 的边界。模型生成的标题往往在主轮次结束后才完成，因此同步写入会延迟 agent（智能体）响应，而作为可变元数据写入则会绕过常规的持久化、回放和沿袭语义。并发提示词、提供方 HMR（热模块替换）、取消以及被忽略的中止信号，还可能让未受版本校验约束的后台结果覆盖更新的标题。
 
 ## 决策
 
@@ -18,13 +18,13 @@ Status: implemented
 
 每个已接受的修订都是纯日志 `session/title` 事件。其载荷包含规范化后的非空文本、用于派生标题的所有合格且来源为人类的 `user/message` 的准确 seq，以及回退来源信息，或已注册的提供方 id 加可选的提供方和模型路由。辅助标题模型发起调用前，共享辅助组件会追加一个纯日志 `session/title-llm-request` 事件，其载荷包含标题提供方 id、准确的源 seq、路由、系统提示词、消息和输出 token 上限；即使后续生成失败，这次请求仍可审计。发送的请求信封经过深度冻结，以确保其与该记录精确一致，但它有意不携带进程本地的 agent loop（智能体循环）请求身份，因此仅针对 agent loop 的重建检查不会将它与主对话请求头进行比较。未进入调用阶段的验证失败不会创建请求事件。`foldSessionTitle()` 选择最新的标题事件，并将该事件的 seq 和时间戳加入 `SessionTitleSnapshot`。这两类事件都不会进入 `session.surface` 或 `deriveMessages()`。
 
-核心会话包通过 `ctx.sessions.appendOutOfBand()` 暴露这一接口，但只允许所属插件同时通过声明合并向 `OutOfBandSessionEventMap` 添加标记的插件事件类型使用。开放轮次会直接接收纯日志事件，并负责其常规检查点。已关闭的日志会在该插件的触发器下接收 `turn/start → event → turn/end`，随后等待刷写完成。合成轮次一旦开启，即使目标追加失败，系统仍会尝试将其关闭并刷写；整个序列完成前会延迟 detach。会话标题提供不带消息来源的 `session-title` 零步骤触发器，并让这两类标题事件都使用这一服务边界。该触发器并非由消息引起，因此可合并扩展的 `TurnTriggerMap` 的消费方在读取变体字段前，会先根据 `kind` 判别类型；例如，目标轮次准入会忽略所有非 `message` 触发器。
+标题服务会在检查当前修订和确切的实时会话后，直接追加 `session/title`；随附模型辅助函数同样会在发起调用前追加其字面量 `session/title-llm-request` 记录。两类记录都可以位于轮次之间，而无需虚构执行边界。持久化会尽快观察它们，并通过常规检查点和生命周期 teardown 排空；标题发布不会强制逐事件 flush。事件所有方与 `Session.append()` 之间不存在通用标记、类型断言或结算队列。这是[独立纯日志事件决策](../simplification/2026-07-28-remove-synthetic-log-only-turns.md)在特定领域中的应用。
 
 ### 输入与异步时序
 
 只有人类来源的 `user/message` 事件中的文本块才符合条件。空提示词、仅含控制字符的提示词和非文本提示词会等待下一条合格消息。服务从提示词路径调度首个回退标题而不等待其完成，随后规范化空白和控制序列，应用已配置的单词数和 UTF-8 字节限制且不拆分代码点，并记录第一条消息的 seq。
 
-仅当主循环存在已记录在日志中的当前提供方/模型路由时，自动提供方工作才会启动。`request/header` 新追加到日志时，会直接启动待执行工作；如果请求头没有变化，则由循环构建并带有标记的 `llm/stream` 请求会先与折叠所得的路由匹配，再启动该工作。随后，生成工作独立于 agent 响应运行；完成结果在被接受时加入当时开放的轮次，否则使用零步骤追加路径。显式调用 `refresh(session, signal?)` 会生成尚缺的回退标题并等待已注册的提供方；没有提供方时则返回回退标题。调用方在回退标题刷写期间取消调用不会回滚这次持久化追加，但 `refresh()` 会重新检查取消信号，并让调用以拒绝结束，而非返回成功。并发刷新会在等待回退标题持久化完成前预留会话本地修订号，因此在任何调用有机会造成提供方完成顺序倒置之前，较新的调用就会取代较早的调用。自动工作与并发刷新在每个会话内共用同一个进行中的回退 promise，因此首次回退只会创建一个标题事件和一个零步骤轮次。会话标题功能产生的所有带外写入在每个会话内共用一个结算队列；接替执行的模型请求会等待任何更早的标题写入完成，而被取代的模型调用本身仍可独立中止，且无法提交陈旧输出。异步压缩（compaction）期间接受的标题仍是纯日志事件，因此压缩器在摘要完成后执行的表层节点检查不会因该标题而失败；并发的表层变更仍会使替换失效。
+仅当主循环存在已记录在日志中的当前提供方/模型路由时，自动提供方工作才会启动。`request/header` 新追加到日志时，会直接启动待执行工作；如果请求头没有变化，则由循环构建并带有标记的 `llm/stream` 请求会先与折叠所得的路由匹配，再启动该工作。随后，生成工作独立于 agent 响应运行；完成结果会追加一个独立事件，而不改变轮次状态。显式调用 `refresh(session, signal?)` 会生成尚缺的回退标题并等待已注册的提供方；没有提供方时则返回回退标题。调用方取消不会回滚已接受的回退事件，`refresh()` 会在返回成功前重新检查信号。并发刷新会在提供方工作之前预留会话本地修订号，因此较新的调用会在任何调用有机会造成提供方完成顺序倒置之前中止并取代较早的调用。自动工作与并发刷新在每个会话内共用同一个进行中的回退 promise，因此首次回退只会创建一个标题事件。异步压缩（compaction）期间接受的标题仍是纯日志事件，因此压缩器在摘要完成后执行的表层节点检查不会因该标题而失败；并发的表层变更仍会使替换失效。
 
 首消息提供方仅在新会话首次创建回退标题时调度一次。自动执行失败后，后续提示词不会重新调度；`refresh()` 是重试路径。全部消息提供方会在每条合格且由人类发出的提示词后调度，并传入截至该修订的所有合格消息，包括预置历史记录。较新的修订会中止并取代更早的待执行或活跃工作。
 
@@ -34,13 +34,13 @@ Status: implemented
 
 模型提供方必须显式配置单词数、CJK 字符数、输入字节数、输出 token 数和超时限制。可选的 `provider` 和 `model` 覆盖项必须成对提供；两者均未提供时，辅助组件会使用主请求已记录请求头中的准确路由。系统在一条固定且能区分语言的指令下，将选中的消息封装为 JSON。发出的 `GenerateOptions` 携带 `purpose: 'session-title'`；DeepSeek 适配器将该用途映射为禁用思考且省略推理强度设置的请求，使受限输出成为可见的标题文本，而主对话仍沿用已配置的思考模式。输入字节数按最终形成的用户提示词计算，其中包括包装文本、seq 字段和 JSON 转义；系统会在记录请求或发起调用前完成这项检查。过大输入会被拒绝而不是截断，因为截断会让记录的源消息 seq 错误地表示这些消息已被完整使用。系统在消费每个流分片时以及流完成后都会检查融合后的截止时间，因此即使拦截器或适配器忽略中止信号，超时后返回的成功结果也不会被接受。
 
-自动提供方故障只会发出非致命警告，并保留最新标题。显式刷新失败则会向调用方返回拒绝。输出必须是非空文本，并包含来自固定请求、唯一且有序的 seq；服务会在持久接受前对其进行规范化并施加字节限制。
+自动提供方故障只会发出非致命警告，并保留最新标题。显式刷新失败则会向调用方返回拒绝。输出必须是非空文本，并包含来自固定请求、唯一且有序的 seq；服务会在日志接受前对其进行规范化并施加字节限制。
 
 ### Fork 与消费方
 
 与源日志的其他部分相同，fork 会原样继承作为种子的标题事件。首消息提供方不会自动为 fork 重新生成标题。全部消息提供方可以在子会话出现后续提示词后追加一项归子会话所有的修订，并使用继承的合格消息和新增的合格消息。
 
-`ctx.sessionQuery.readTitle()` 会折叠一份实时优先或已持久化的日志，而不会在 `listSessions()` 期间加载标题。TUI 使用最新标题作为其标题栏副标题，并在完成终端安全渲染后，将终端窗口标题设置为 `<session title> — <configured product title>`。Web host 会在每个已附加会话的订阅基线之后，以及转发实时原始标题事件后立即，将同一份日志状态折叠为经过校验的 mux 控制帧。即使控制帧先于列表或会话实例创建抵达，浏览器也只保留标题事件 seq 较新的版本；侧边栏标签、搜索、面包屑和浏览器标题会随投影后的修订更新。`session.list` 仍只包含元数据，因此尚未打开的持久化会话会继续以 cwd 基名或 id 作为回退，直至打开或恢复会话时附加其日志。浏览器仅在选中已有标题的会话时将标题设置为 `<session title> — <existing HTML title>`，否则保留产品标题。合成标题轮次本身仍会完成，并作为元数据写入的持久性边界；报告 agent 完成情况的消费方使用核心的 `findLastMessageTurnEnd()` 折叠逻辑，因此后续的标题轮次、注入轮次或其他归插件所有的轮次无法取代此前由消息触发的结果。
+`ctx.sessionQuery.readTitle()` 会折叠一份实时优先或已持久化的日志，而不会在 `listSessions()` 期间加载标题。TUI 使用最新标题作为其标题栏副标题，并在完成终端安全渲染后，将终端窗口标题设置为 `<session title> — <configured product title>`。Web host 会在每个已附加会话的订阅基线之后，以及转发实时原始标题事件后立即，将同一份日志状态折叠为经过校验的 mux 控制帧。即使控制帧先于列表或会话实例创建抵达，浏览器也只保留标题事件 seq 较新的版本；侧边栏标签、搜索、面包屑和浏览器标题会随投影后的修订更新。`session.list` 仍只包含元数据，因此尚未打开的持久化会话会继续以 cwd 基名或 id 作为回退，直至打开或恢复会话时附加其日志。浏览器仅在选中已有标题的会话时将标题设置为 `<session title> — <existing HTML title>`，否则保留产品标题。报告 agent 完成情况的消费方使用核心的 `findLastMessageTurnEnd()` 折叠逻辑，因此后续的轮次间标题记录无法取代此前由消息触发的结果。
 
 ## 考虑过的替代方案
 
@@ -57,6 +57,6 @@ Status: implemented
 - 标题可以在 JSONL 和 SQLite 持久化中存续、重放并遵循 fork 继承语义，而无需单独的可变记录。
 - Web 标题仍以增量方式从日志交付，无需标题索引或扫描持久化列表；冷启动列表项会在会话附加后改用标题。
 - 回退标题会立即出现。每个新建的 Web 会话都会增加一次针对首消息的辅助调用；其他组合可以自行决定更优标题是否值得模型成本，以及后续提示词是否需要重新生成会话标题。
-- 辅助请求记录和延迟接受的标题会占用事件 seq，并可能创建平衡的零步骤轮次，因此持久化会同时呈现尝试发起的调用与已接受的更新，尽管模型历史和 KV 缓存标识保持不变。
+- 辅助请求记录和延迟接受的标题会占用事件 seq，但不会占用轮次编号，因此持久化会同时呈现尝试发起的调用与已接受的更新，尽管模型历史和 KV 缓存标识保持不变。
 - 单个提供方和每会话单调递增的修订号让释放、取代和陈旧结果拒绝行为明确可见，但多策略优先级必须由复合提供方负责。
 - 手动重命名、删除、生成标题与用户标题的优先级、搜索和列表索引不在此功能范围内。

.agents/notes/implemented/process/2026-07-21-serial-cross-platform-ci-reference.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/process/2026-07-21-serial-cross-platform-ci-reference.md
-2026-07-21-serial-cross-platform-ci-reference.md: 9ecd7906d2f28461a8a6f3f2fe485580214b39f3
-2026-07-21-serial-cross-platform-ci-reference.zh.md: ed927012c5b0ba9d43444a129d10d966f5e7d923
+2026-07-21-serial-cross-platform-ci-reference.md: 71b364f72a094f7899a0929eec29f3a16ccc8a93
+2026-07-21-serial-cross-platform-ci-reference.zh.md: 0f324a5c235a2b495186caf0d6cc0490cc5876e3

.agents/notes/implemented/process/2026-07-21-serial-cross-platform-ci-reference.md

@@ -12,6 +12,8 @@ Encoding the one-minute non-Windows target and three-minute Windows target as jo
 
 Reviewers also need a direct answer to a simpler question: what happens when the repository's complete primary Node CI aggregate runs without matrix selection, shard variables, or concurrent gates on each selected hosted operating system?
 
+Real-kernel sandbox proofs require specific hosted operating systems and architectures but do not provide a pull-request merge verdict. Repeating that four-job matrix for every pull request consumes Linux, arm64 Linux, and macOS capacity without satisfying branch protection or contributing to the required aggregate in another workflow.
+
 ## Decision
 
 [CI](../../../../.github/workflows/ci.yml) gives pull-request and master-push events complementary responsibilities. Pull requests run consolidated Linux and Windows jobs plus the Node compatibility and Python contracts on standard GitHub-hosted capacity. A push to `master` skips those jobs and runs four explicit references: `serial / linux`, `serial / macos`, and `serial / windows` on standard hosted runners, plus `serial / linux (self-hosted standby)` on the in-house `vm-backup` pool — the hot-standby drill that continuously re-proves the failover target described in the [failover runbook](2026-07-26-ci-failover-runbook.md). They intentionally duplicate their short checkout, runtime setup, and immutable install sequences instead of hiding the operating systems behind a matrix or reusable workflow. `workflow_dispatch` is reserved for runner benchmarks.
@@ -22,7 +24,9 @@ Platform ownership remains explicit inside that complete aggregate. `pty-local`
 
 The macOS reference runs the ordinary Vitest project in forked processes. Node 24 on macOS arm64 has aborted in its CJS lexer from a worker thread; the process boundary contains that external runtime failure without removing any test from the aggregate, while Linux and Windows retain the lower-overhead thread pool. Repository-owned races are fixed at their observation boundaries: dev bundle polling stages each candidate table, graph, and watch-baseline map before publishing a rescan, and a missing bundle remains dirty until a successful content hash. PTY readiness retains a prompt candidate while polling checks foreground ownership; the ordinary silence bound covers inherited markers from interactive children. Real PTY fixtures assemble synchronization tokens at runtime so the interactive shell's input echo cannot satisfy a child-readiness wait. The live-link package-manager e2e preserves the workflow-prepared Corepack home and pnpm metadata/store caches while isolating the other managers' mutable caches, so it does not discard reusable package-manager state before the install.
 
-Master reference jobs are diagnostic and do not participate in the pull request's required `all checks passed` result. A pull request runs only its required jobs; a master push runs only the serial references. Performance is evaluated from completed hosted-job timestamps and reported as a measurement; it is not encoded as a `timeout-minutes` value.
+The standalone [Sandbox](../../../../.github/workflows/sandbox.yml) workflow belongs to the reference side of the same split. Its bwrap, Landlock x64/arm64, and Seatbelt real-kernel matrix runs only after a push to `master`. Those four jobs are diagnostic: they are not branch-protection requirements and do not feed `all checks passed` across workflow files. Pull-request CI still checks sandbox source through its ordinary unit and coverage inventory; the host-kernel and packed-install proofs report after merge.
+
+Master reference jobs are diagnostic and do not participate in the pull request's required `all checks passed` result. The CI and Sandbox workflows keep their cross-platform references on master pushes. Performance is evaluated from completed hosted-job timestamps and reported as a measurement; it is not encoded as a `timeout-minutes` value.
 
 The portable reference uses GitHub's standard `ubuntu-latest`, `macos-latest`, and `windows-2025` labels; `serial / windows` is the one remaining native-Windows job, the complete-kernel oracle behind the Wine-hosted pull-request lane ([Wine lane decision](2026-07-27-wine-windows-gates-experiment.md)). Required pull-request jobs use portable standard capacity under the [required-CI decision](2026-07-23-portable-required-pull-request-ci.md). Higher-core hosted runners remain manual benchmarks because a correctness path must remain runnable without repository-external runner configuration.
 
@@ -31,6 +35,7 @@ The portable reference uses GitHub's standard `ubuntu-latest`, `macos-latest`, a
 - **Set each timeout equal to its latency target** - rejected because scheduling variance would cancel correct work and suppress the evidence needed to diagnose a regression.
 - **Trust only the concurrent primary inventory** - rejected because scheduling and validation share implementation assumptions; a serial aggregate is an independent completeness check.
 - **Run the serial references on every pull request** - rejected because they duplicate complete cross-platform aggregates and add macOS work to every change; the required jobs already execute the blocking Linux and Windows contracts.
+- **Run the real-kernel Sandbox matrix on every pull request** - rejected because its four statuses do not participate in branch protection, while repeated installs, Landlock builds, and macOS unit parity consume runner capacity without changing the merge verdict. The master run retains the platform and installed-launcher signal.
 - **Use one operating-system matrix** - rejected because three named jobs make the reference surface visible without another selection mechanism.
 - **Run the serial reference on larger runners** - rejected because both required CI and its independent reference must remain runnable when organization-owned pools cannot allocate jobs.
 
@@ -40,6 +45,8 @@ The workflow contains duplicated setup steps and a master reference run can take
 
 The reference may expose platform failures that the optimized blocking set does not yet claim to support, especially on Windows. Such a failure is evidence about current cross-platform behavior rather than a reason to weaken or silently skip the aggregate.
 
+A sandbox regression visible only to a real host kernel or the packed Landlock install can merge before the master run reports it. That post-merge detection window is accepted in exchange for removing four non-blocking jobs from every pull request; the default branch retains the complete signal.
+
 The explicit `pty-local` ownership boundary means Windows does not claim coverage for a backend it cannot load, and forked macOS unit workers cost more process startup time. In return, every supported surface has an honest platform oracle, a native runtime abort cannot erase the rest of the unit result, and timing-sensitive observers start from state established before callers can mutate it.
 
 Removing strict duration timeouts means a latency regression is observed rather than automatically cancelled. Hosted measurements must therefore accompany performance changes, while the completed logs retain the information needed to optimize the slow lane.

.agents/notes/implemented/process/2026-07-21-serial-cross-platform-ci-reference.zh.md

@@ -12,6 +12,8 @@ Status: implemented
 
 评审人还需要直接回答一个更简单的问题：在每个选定的托管操作系统上，如果仓库完整的主 Node CI 聚合流程不使用矩阵选择、分片变量或并发门禁，运行结果会怎样？
 
+真实内核沙箱验证需要特定的托管操作系统和架构，但不会产生拉取请求的合并裁决。在每个拉取请求上重复运行这个包含四个作业的矩阵会消耗 Linux、arm64 Linux 和 macOS 容量，却既不能满足分支保护，也无法参与另一工作流中的必需聚合结果。
+
 ## 决策
 
 [CI](../../../../.github/workflows/ci.yml) 为拉取请求事件与 master 推送事件赋予互补的职责。拉取请求在 GitHub 标准托管容量上运行合并后的 Linux 和 Windows 作业，以及 Node 兼容性与 Python 契约。向 `master` 推送时会跳过这些作业，改为运行四个显式参考作业：在标准托管运行器上的 `serial / linux`、`serial / macos` 和 `serial / windows`，以及在公司自有 `vm-backup` 池上的 `serial / linux (self-hosted standby)`——后者是热备演练，持续验证[故障切换手册](2026-07-26-ci-failover-runbook.md)所描述的切换目标。这些作业有意分别重复简短的代码检出、运行时设置和依赖锁定的安装步骤，不用矩阵或可复用工作流把操作系统差异隐藏起来。`workflow_dispatch` 仅用于运行器基准测试。
@@ -22,7 +24,9 @@ Status: implemented
 
 macOS 参考流程使用 fork 进程运行常规 Vitest 项目。macOS arm64 上的 Node 24 曾在工作线程中执行 CJS 词法分析器时异常终止；进程边界能够隔离这一外部运行时故障，且无需从聚合流程中删除任何测试，而 Linux 与 Windows 仍使用开销更低的线程池。仓库自身引入的竞态均在相应的观测边界修复：开发构建产物的轮询逻辑每次发布重新扫描结果前，都会先暂存候选表、候选图和候选监视基线映射；构建产物缺失后会一直保持脏状态，直到成功计算内容哈希。PTY 就绪检测会在轮询检查前台进程组归属期间保留提示符候选项；常规静默时限也适用于交互式子进程继承提示符标记的情况。真实 PTY fixture 会在运行时拼接同步标记，使就绪等待逻辑不会把交互式 shell 的输入回显误判为子进程已就绪。实时链接场景下的包管理器 e2e 会保留由工作流预先准备的 Corepack 主目录、pnpm 元数据缓存和 store 缓存，同时隔离其他包管理器的可变缓存，因此不会在安装前丢弃可复用的包管理器状态。
 
-master 分支的参考作业仅用于诊断，不参与拉取请求所要求的 `all checks passed` 结果。拉取请求只运行其必需作业；向 master 推送时只运行串行参考作业。系统根据已完成托管作业的时间戳评估性能，并将其报告为测量结果，而不是写成 `timeout-minutes` 值。
+独立的 [Sandbox](../../../../.github/workflows/sandbox.yml) 工作流属于同一职责划分中的参考侧。其 bwrap、Landlock x64/arm64 与 Seatbelt 真实内核矩阵只在向 `master` 推送后运行。这四个作业仅用于诊断：它们既不是分支保护的必需项，也不会跨工作流计入 `all checks passed`。拉取请求 CI 仍通过常规的单元测试与覆盖率清单检查沙箱源码；宿主内核与 packed-install 验证在合并后报告结果。
+
+master 分支的参考作业仅用于诊断，不参与拉取请求所要求的 `all checks passed` 结果。CI 与 Sandbox 工作流把跨平台参考流程保留在 master 推送上。系统根据已完成托管作业的时间戳评估性能，并将其报告为测量结果，而不是写成 `timeout-minutes` 值。
 
 可移植的参考流程使用 GitHub 标准的 `ubuntu-latest`、`macos-latest` 和 `windows-2025` 标签；`serial / windows` 是仅存的原生 Windows 作业，是 Wine 托管拉取请求通道背后的完整内核标尺（[Wine 通道决策](2026-07-27-wine-windows-gates-experiment.md)）。依据[必需 CI 决策](2026-07-23-portable-required-pull-request-ci.md)，拉取请求必需作业使用可移植的标准容量。更高核心数的托管运行器仍仅用于手动基准测试，因为正确性路径必须无需仓库外部的运行器配置即可运行。
 
@@ -31,6 +35,7 @@ master 分支的参考作业仅用于诊断，不参与拉取请求所要求的
 - **将每个超时值设为相应延迟目标**：不予采纳，因为调度波动会中止原本正确的执行，并使诊断回归所需的证据无法产生。
 - **仅信任并发执行的主门禁清单**：不予采纳，因为调度逻辑与校验逻辑共享实现假设；串行聚合流程是一项独立的完整性检查。
 - **在每个拉取请求上运行串行参考作业**：不予采纳，因为这些作业会重复完整的跨平台聚合流程，并为每项改动增加 macOS 工作；必需作业已经执行阻塞性的 Linux 和 Windows 契约。
+- **在每个拉取请求上运行真实内核 Sandbox 矩阵**：不予采纳，因为它的四个状态不参与分支保护，而重复安装、Landlock 构建以及为保持平台一致而运行的 macOS 单元测试会消耗运行器容量，却不会改变合并裁决。master 上的运行保留平台与已安装 launcher 的信号。
 - **使用一个操作系统矩阵**：不予采纳，因为三个具名作业无需另一套选择机制，就能让参考流程的构成清晰可见。
 - **在大型运行器上运行串行参考流程**：不予采纳，因为当组织自有运行器池无法分配作业时，必需 CI 及其独立参考流程都必须仍可运行。
 
@@ -40,6 +45,8 @@ master 分支的参考作业仅用于诊断，不参与拉取请求所要求的
 
 参考流程可能暴露某些平台上的故障，而优化后的阻塞门禁集合尚未声明支持这些平台，Windows 尤其如此。这类失败反映了当前的跨平台行为，不应成为削弱或静默跳过该聚合流程的理由。
 
+仅在真实宿主内核或打包后的 Landlock 安装中可见的沙箱回归，可能在 master 上的运行报告前已经合并。我们接受这个合并后检测窗口，以换取从每个拉取请求中移除四个非阻塞作业；默认分支仍保留完整信号。
+
 明确的 `pty-local` 归属边界意味着 Windows 不会声称覆盖一个无法加载的后端，而 macOS 采用 fork 的单元测试工作进程会增加进程启动开销。这些代价换来的是：支持范围内的每项功能都有能够如实反映对应平台行为的判据，原生运行时异常终止不会抹掉其余单元测试结果，各项对时序敏感的观测逻辑也都会以调用方有机会修改状态前已建立的状态作为起点。
 
 移除严格的时长超时后，系统会观测到延迟回归，而不是在发生回归时自动取消运行。因此，性能改动必须附带托管环境测量结果，已完成的日志则保留优化最慢通道所需的信息。

.agents/notes/implemented/simplification/2026-07-28-remove-synthetic-log-only-turns.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/simplification/2026-07-28-remove-synthetic-log-only-turns.md
+2026-07-28-remove-synthetic-log-only-turns.md: af4da00f4fe1d7aebff845cd55053bb5b807c979
+2026-07-28-remove-synthetic-log-only-turns.zh.md: 9d72781d6b7cf396a830790d108f4ff25adc816a

.agents/notes/implemented/simplification/2026-07-28-remove-synthetic-log-only-turns.md

@@ -0,0 +1,43 @@
+# Agent Note: Remove synthetic turns for log-only events
+
+Status: implemented
+
+English | [中文](2026-07-28-remove-synthetic-log-only-turns.zh.md)
+
+## Problem
+
+The session store exposed `appendOutOfBand()` so a plugin could publish a late log-only event while no agent turn was running. The method wrapped that event in `turn/start` and `turn/end`, then flushed it. This preserved the old rule that every durable event had to live inside a turn, but it made one identifier mean both a model-loop execution and a persistence-only update.
+
+That rule was introduced when persistence recovery treated the last `turn/end` as the only committed boundary. The persistence scanners now preserve every valid contiguous event, and crash repair reacts only to an actually open turn. Idle context already uses the same capability by appending `user/message` between turns. Retaining synthetic turns for title updates therefore inflated turn counts, produced execution outcomes for work that never ran the model, and let a late metadata write consume the next turn number.
+
+The generic seam also duplicated domain policy. Its marker map said which plugin events were eligible, while the title capability already owned cancellation, liveness, and stale-result rules. Replacing it with another generic or title-specific append wrapper would preserve the same type indirection for two literal event types.
+
+## Decision
+
+`SessionStore.appendOutOfBand()`, `OutOfBandSessionEventMap`, and `OutOfBandSessionEventType` do not exist. A plugin that owns a log-only event appends it through `Session`; when the operation promises durability, it explicitly awaits `ctx.sessions.flush(session)`. No turn is opened solely to obtain that checkpoint.
+
+Core session invariants continue to enforce core-owned execution relations: turn and step numbering, enclosure of steering, assistant, tool, todo, and request-header events, and same-step tool call/result pairing. Core permits merge-extensible events between turns because only their declaring plugin knows whether they are execution-scoped or standalone. Plugin invariant companions remain responsible for their own event relations.
+
+The title service appends `session/title` directly after its existing service, revision, cancellation, and live-session checks. The bundled model helper appends its literal `session/title-llm-request` record before dispatch. Persistence observes both through the eager `session/event` path and drains them at ordinary checkpoints and lifecycle teardown; neither append forces a flush merely because it is between turns. A fallback, auxiliary request record, or accepted provider title may therefore appear after `turn/end` and before the next `turn/start`.
+
+A session fork may end at any stable event position outside an open turn, not only at `turn/end`. This preserves standalone title and context records in a default fork while still rejecting a prefix cut through active execution.
+
+The historical [universal turn-enclosure decision](../../archived/architecture/2026-06-15-turn-enclosure-invariant.md) remains useful only as the reason the synthetic mechanism was introduced. The [context-injection decision](../architecture/2026-07-24-separate-context-injection-from-turn-execution.md) established the current meaning: one turn represents one model-loop execution.
+
+## Alternatives considered
+
+**Keep synthetic zero-step turns.** This preserves a uniform-looking log and reuses `turn/end` as a flush point, but it reports executions that never happened, perturbs turn numbering, and makes every turn consumer filter persistence-only records. Durability already has the independent `session/flush` boundary.
+
+**Keep a generic core durable-append helper without synthetic turns.** A method that performs `append()` plus `flush()` is small, but its eligibility marker and concurrency promises would still centralize plugin policy in the session store. The event owners already have literal typed append sites, and a caller that truly needs a durability barrier can await the existing `session/flush` operation at that boundary.
+
+**Store titles as mutable session metadata.** This avoids between-turn events but creates a second mutation, replay, persistence, and fork protocol beside the append-only log. Titles remain replayable latest-wins events instead.
+
+**Require every plugin event to declare standalone eligibility to core.** This keeps a central allowlist but makes absence mean an execution relation that core cannot verify. Merge-extensible unions already assign semantic ownership to the declaring plugin; its invariant companion is the correct enforcement point.
+
+## Verification
+
+Core invariant tests accept an unknown plugin event between turns while continuing to reject built-in execution events there. Hook, compaction, plan-mode, Code Mode dispatch, and approval invariant companions replay existing logs and reject the same execution-scoped events before commit when no turn is open. Session-title service tests pin one direct fallback event under concurrent refresh, detached-session rejection, and newest-revision acceptance. JSONL and SQLite round trips preserve a title appended after `turn/end` through the persistence lifecycle drain, and fork tests retain a standalone log-only tail while rejecting boundaries inside an open turn. A keyless assembled ACP snapshot delays the model-backed title until after `turn/end` and pins one standalone provider title with no synthetic turn. Generated API and type-equivalence catalogs contain no removed symbol.
+
+## Consequences
+
+Turn counts and outcomes again describe model-loop executions only. Standalone events consume session seqs, start eager persistence like every other append, and require owners to request an explicit durability barrier only when their operation promises one. Generic plugin mistakes no longer fail under a core default enclosure rule, so each plugin that needs an execution relation must state and test that relation itself. The title capability keeps revision ordering and lifecycle persistence with less core state, no duplicate type seam, and no turn-number collision.

.agents/notes/implemented/simplification/2026-07-28-remove-synthetic-log-only-turns.zh.md

@@ -0,0 +1,43 @@
+# Agent Note: 移除纯日志事件的合成轮次
+
+Status: implemented
+
+[English](2026-07-28-remove-synthetic-log-only-turns.md) | 中文
+
+## 问题
+
+会话存储曾暴露 `appendOutOfBand()`，让插件可以在没有 agent（智能体）轮次运行时发布延迟到达的纯日志事件。该方法会用 `turn/start` 和 `turn/end` 包住事件，再将其刷写。这保留了「每个持久事件都必须位于轮次内」的旧规则，却让同一个标识符既表示模型循环执行，又表示仅持久化更新。
+
+引入该规则时，持久化恢复曾将最后一个 `turn/end` 视为唯一的已提交边界。如今，持久化扫描器会保留每个合法且连续的事件，崩溃修复也只处理确实处于开放状态的轮次。空闲上下文早已采用同一机制，在轮次之间追加 `user/message`。因此，为标题更新保留合成轮次会夸大轮次计数、为从未运行模型的工作产生执行结果，还会让延迟到达的元数据写入占用下一个轮次编号。
+
+通用 seam 还重复了领域策略。它的标记映射说明哪些插件事件符合条件，而标题功能本就拥有取消、活跃性和陈旧结果处理规则。改用另一个通用或标题专属追加包装层，仍会为两个字面量事件类型保留同一层类型间接性。
+
+## 决策
+
+`SessionStore.appendOutOfBand()`、`OutOfBandSessionEventMap` 和 `OutOfBandSessionEventType` 均不再存在。拥有纯日志事件的插件通过 `Session` 追加该事件；当操作承诺持久性时，插件会显式等待 `ctx.sessions.flush(session)`。系统不会仅为获得该检查点而打开轮次。
+
+核心会话不变量继续强制核心所属的执行关系：轮次与步骤编号、steering、助手、工具、待办和请求头事件的封闭，以及同一步骤内的工具调用／结果配对。核心允许可合并扩展事件位于轮次之间，因为只有声明它们的插件知道这些事件受执行作用域约束，还是可以独立存在。插件的不变量配套组件仍负责其自身的事件关系。
+
+标题服务会在完成既有的服务状态、修订、取消和实时会话检查后，直接追加 `session/title`。随附模型辅助函数会在发起调用前追加其字面量 `session/title-llm-request` 记录。持久化通过尽快处理的 `session/event` 路径观察两者，并在常规检查点与生命周期 teardown 时排空；二者都不会仅因为位于轮次之间就强制 flush。因此，回退标题、辅助请求记录或已接受的提供方标题可以出现在 `turn/end` 之后、下一个 `turn/start` 之前。
+
+会话 fork 可以结束于开放轮次之外的任意稳定事件位置，而不限于 `turn/end`。这样，默认 fork 会保留独立标题和上下文记录，同时仍拒绝在活跃执行过程中截断前缀。
+
+历史上的[通用轮次封闭决策](../../archived/architecture/2026-06-15-turn-enclosure-invariant.md)如今只适合用于解释为何曾引入合成机制。[上下文注入决策](../architecture/2026-07-24-separate-context-injection-from-turn-execution.md)确立了当前语义：一个轮次表示一次模型循环执行。
+
+## 曾考虑的替代方案
+
+**保留合成的零步骤轮次。** 这可以让日志在形式上保持统一，并复用 `turn/end` 作为刷写点，但会报告从未发生的执行、扰动轮次编号，还会迫使每个轮次消费方过滤仅持久化记录。持久性已有独立的 `session/flush` 边界。
+
+**保留不使用合成轮次的通用核心持久追加辅助函数。** 执行 `append()` 再执行 `flush()` 的方法本身很小，但其准入标记和并发承诺仍会将插件策略集中到会话存储中。事件所有方已经拥有直接、类型化的字面量追加点；真正需要持久性屏障的调用方可以在该边界等待既有的 `session/flush` 操作。
+
+**将标题存储为可变会话元数据。** 这可以避免轮次间事件，却会在仅追加日志之外建立第二套变更、回放、持久化和 fork 协议。标题仍采用可回放、后写覆盖的事件。
+
+**要求每个插件事件向核心声明可独立存在的资格。** 这可以保留中心准入列表，但会让缺少声明意味着一种核心无法验证的执行关系。可合并扩展联合类型已经将语义所有权赋予声明事件的插件；该插件的不变量配套组件才是正确的强制位置。
+
+## 验证
+
+核心不变量测试会接受轮次之间的未知插件事件，同时继续拒绝位于该处的内置执行事件。钩子、压缩（compaction）、plan-mode、Code Mode 分发和审批的不变量配套组件会回放既有日志，并在没有开放轮次时，于提交前拒绝相同的执行作用域事件。会话标题服务测试会在并发刷新、会话脱离拒绝和最新修订接受场景下，固定一个直接追加的回退事件。JSONL 和 SQLite 往返测试会通过持久化生命周期排空保留追加在 `turn/end` 之后的标题；fork 测试会保留独立纯日志尾部，同时拒绝位于开放轮次内的边界。一个无密钥、经完整组装的 ACP（Agent Client Protocol）快照会将模型生成的标题延迟到 `turn/end` 之后，并固定一个不含合成轮次的独立提供方标题。生成的 API 和类型等价性目录不含任何已移除符号。
+
+## 后果
+
+轮次计数和结果重新只描述模型循环执行。独立事件会占用会话 seq，像其他追加一样启动尽快持久化，并且仅当操作承诺持久性时，才要求事件所有方请求显式持久性屏障。通用插件错误不再因核心默认的封闭规则而失败，因此每个需要执行关系的插件都必须自行声明并测试该关系。标题功能保留修订排序和生命周期持久化，同时减少了核心状态，不再重复类型 seam，并消除了轮次编号冲突。

.agents/notes/rejected/simplification/2026-06-20-truncate-interrupted-turns.i18n.yaml

@@ -1,6 +1,6 @@
 # Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
-#   pnpm run verify-translation-pairing --write
-2026-06-20-truncate-interrupted-turns.md: af18618ad4c41af125e37c51b9fd971dd8eae64e
-2026-06-20-truncate-interrupted-turns.zh.md: a20d0169f7735aa7a9437c10c958580c00704171
+#   pnpm run verify-translation-pairing --write .agents/notes/rejected/simplification/2026-06-20-truncate-interrupted-turns.md
+2026-06-20-truncate-interrupted-turns.md: 3c7acf8d673568f851edd52635a28f73d9bf5f6f
+2026-06-20-truncate-interrupted-turns.zh.md: 36a3d3f3cbd736c8f9a70fea453a314c0495d6f2

.agents/notes/rejected/simplification/2026-06-20-truncate-interrupted-turns.md

@@ -31,6 +31,6 @@ A crash can lose real work from the final turn: assistant text, tool calls, and
 
 ## Related
 
-This is a direct simplification of [session persistence](../../implemented/architecture/2026-06-14-session-persistence.md) and [turn enclosure](../../implemented/architecture/2026-06-15-turn-enclosure-invariant.md). It also removes much of the motivation for durable step boundary events, making [drop durable step boundary events](2026-06-20-drop-durable-step-boundaries.md) smaller.
+This is a direct simplification of [session persistence](../../implemented/architecture/2026-06-14-session-persistence.md) and the historical [universal turn-enclosure rule](../../archived/architecture/2026-06-15-turn-enclosure-invariant.md). It also removes much of the motivation for durable step boundary events, making [drop durable step boundary events](2026-06-20-drop-durable-step-boundaries.md) smaller.
 
 <!-- agent-note-format: alternatives-not-recorded (pre-format Agent Note) -->

.agents/notes/rejected/simplification/2026-06-20-truncate-interrupted-turns.zh.md

@@ -31,6 +31,6 @@ Status: rejected — 单个轮次可以包含大量真实工作，包括多个
 
 ## 相关
 
-本提案是对[会话持久化](../../implemented/architecture/2026-06-14-session-persistence.md)与[轮次封闭不变式](../../implemented/architecture/2026-06-15-turn-enclosure-invariant.md)的直接简化。它还移除了持久化步骤边界事件的大部分动机，使[移除持久化步骤边界事件](2026-06-20-drop-durable-step-boundaries.md)的改动更小。
+本提案是对[会话持久化](../../implemented/architecture/2026-06-14-session-persistence.md)与历史上的[通用轮次封闭规则](../../archived/architecture/2026-06-15-turn-enclosure-invariant.md)的直接简化。它还移除了持久化步骤边界事件的大部分动机，使[移除持久化步骤边界事件](2026-06-20-drop-durable-step-boundaries.md)的改动更小。
 
 <!-- agent-note-format: alternatives-not-recorded (pre-format Agent Note) -->