test(session): align turn-end contract artifacts

docs/architecture.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 docs/architecture.md
-architecture.md: 401dc4e0a1875488fa3107e9f50a6a25c0e8aa89
-architecture.zh.md: ee666e593e2c38c4ede4f64254de0755cc95290e
+architecture.md: fe125063c8215d18b2aec7444fc20fa8d9a24028
+architecture.zh.md: d661cd2d450ce8111b5df5b85286d93b92aa6969

docs/architecture.md

@@ -122,7 +122,7 @@ Adapter selection, dispatch, and iteration failures become terminal error or abo
 
 Other failures use `agent/error`; cancellation and disposal beat recovery. Before request-header commit, the turn signal cancels capability preparation; undispatched tools get synthetic `tool/call`/`ABORTED_BEFORE_DISPATCH` pairs. Effective `cancel(cause)` reports its cause before clearing and aborting; idle calls emit nothing. Durability distinguishes `aborted` cancellation from `disposed` teardown, which awaits quiescence ([decision](../.agents/notes/implemented/architecture/2026-07-16-explicit-turn-cancellation.md)).
 
-Turn and step events are turn-enclosed; the loop appends `user/message` events only from entered batches inside a turn. A turn opens before the initial claim and pre-step, so rejection, empty input, cancellation, or failure closes a durable turn with `step: 0`. Standalone `compact/* { turn: null }` events consume no turn, and their lock-time markers may interleave with inbox splices. Reload synthesizes interrupted turn ends; `session/end-seed` distinguishes stale compaction orphans from live locks. After close, only `agent/error` reports failures. Each turn has one [TurnEndReason](core-data-structures/session.md#why-a-turn-ended-turnendreasonmap).
+Turn and step events are turn-enclosed; the loop appends `user/message` events only from entered batches inside a turn. A turn opens before the initial claim and pre-step, so rejection, empty input, cancellation, or failure closes a durable turn without any step events. Standalone `compact/* { turn: null }` events consume no turn, and their lock-time markers may interleave with inbox splices. Reload synthesizes interrupted turn ends; `session/end-seed` distinguishes stale compaction orphans from live locks. After close, only `agent/error` reports failures. Each turn has one [TurnEndReason](core-data-structures/session.md#why-a-turn-ended-turnendreasonmap).
 
 ### Agent Handles
 

docs/architecture.zh.md

@@ -122,7 +122,7 @@ idle inject:
 
 其他故障使用 `agent/error`；取消和资源释放优先于恢复。在提交请求头之前，轮次信号会取消功能准备；尚未分派的工具会得到合成的 `tool/call`/`ABORTED_BEFORE_DISPATCH` 对。实际生效的 `cancel(cause)` 会在清空队列和中止前报告原因；空闲调用不发事件。持久化层以 `aborted` 区分取消，以 `disposed` 区分会等待完全停稳的拆卸（[决策](../.agents/notes/implemented/architecture/2026-07-16-explicit-turn-cancellation.md)）。
 
-轮次和步骤事件均位于轮次边界内；loop 只会在轮次内从进入步骤的批次追加 `user/message`。轮次会在首次领取与 pre-step 之前打开，因此拒绝、空输入、取消或失败会以 `step: 0` 关闭一个持久轮次。独立的 `compact/* { turn: null }` 事件不占用轮次，其锁定时刻标记可以与 inbox splice 交错。重新加载会为中断的轮次合成结束事件；`session/end-seed` 区分陈旧的压缩遗留项与活跃锁。关闭后仅由 `agent/error` 报告故障。每个轮次有一个 [TurnEndReason](core-data-structures/session.md#why-a-turn-ended-turnendreasonmap)。
+轮次和步骤事件均位于轮次边界内；loop 只会在轮次内从进入步骤的批次追加 `user/message`。轮次会在首次领取与 pre-step 之前打开，因此拒绝、空输入、取消或失败会关闭一个不包含任何步骤事件的持久轮次。独立的 `compact/* { turn: null }` 事件不占用轮次，其锁定时刻标记可以与 inbox splice 交错。重新加载会为中断的轮次合成结束事件；`session/end-seed` 区分陈旧的压缩遗留项与活跃锁。关闭后仅由 `agent/error` 报告故障。每个轮次有一个 [TurnEndReason](core-data-structures/session.md#why-a-turn-ended-turnendreasonmap)。
 
 ### Agent 句柄
 

docs/core-data-structures/session.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 docs/core-data-structures/session.md
-session.md: 998e6770a63b6afdb679ddd186da473e35927a02
-session.zh.md: 44e945a2b705846c30c7cfe4c25cb983dc00bee0
+session.md: 3e79a9278578e9fe3860bdbe72ff61319bbfa2c5
+session.zh.md: d701e35cde5a7ae8732efb9081d373410581d6e4

docs/core-data-structures/session.md

@@ -33,14 +33,14 @@ interface SessionEventMap {
    */
   'turn/start': { turn: number }
   /**
-   * Closes turn `turn` after `step`, the last entered step (`0` when none),
-   * with the {@link TurnEndReason} that ended it. The loop does not await a
+   * Closes turn `turn` with the {@link TurnEndReason} that ended it. A turn
+   * with no entered step has no `step/start` or `step/end`. The loop does not await a
    * flush at turn boundaries: `dsh-session-checkpoint-policy` owns the
    * per-request durability checkpoint, and consumers that read storage after
    * `whenIdle()` flush themselves. Success commits the turn; rejection is
    * reported live and does not prevent later work.
    */
-  'turn/end': { turn: number; step: number; reason: TurnEndReason }
+  'turn/end': { turn: number; reason: TurnEndReason }
   /** Opens step `step` of turn `turn` — one model call plus the tool executions it requested. */
   'step/start': { turn: number; step: number }
   /** Closes step `step` of turn `turn`. */

docs/core-data-structures/session.zh.md

@@ -33,14 +33,14 @@ interface SessionEventMap {
    */
   'turn/start': { turn: number }
   /**
-   * Closes turn `turn` after `step`, the last entered step (`0` when none),
-   * with the {@link TurnEndReason} that ended it. The loop does not await a
+   * Closes turn `turn` with the {@link TurnEndReason} that ended it. A turn
+   * with no entered step has no `step/start` or `step/end`. The loop does not await a
    * flush at turn boundaries: `dsh-session-checkpoint-policy` owns the
    * per-request durability checkpoint, and consumers that read storage after
    * `whenIdle()` flush themselves. Success commits the turn; rejection is
    * reported live and does not prevent later work.
    */
-  'turn/end': { turn: number; step: number; reason: TurnEndReason }
+  'turn/end': { turn: number; reason: TurnEndReason }
   /** Opens step `step` of turn `turn` — one model call plus the tool executions it requested. */
   'step/start': { turn: number; step: number }
   /** Closes step `step` of turn `turn`. */

docs/persistence-catalog.md

@@ -657,14 +657,14 @@ Source: [`packages/core/session/src/types.ts:245`](../packages/core/session/src/
 
 ```ts persistence-catalog
 /**
- * Closes turn `turn` after `step`, the last entered step (`0` when none),
- * with the {@link TurnEndReason} that ended it. The loop does not await a
+ * Closes turn `turn` with the {@link TurnEndReason} that ended it. A turn
+ * with no entered step has no `step/start` or `step/end`. The loop does not await a
  * flush at turn boundaries: `dsh-session-checkpoint-policy` owns the
  * per-request durability checkpoint, and consumers that read storage after
  * `whenIdle()` flush themselves. Success commits the turn; rejection is
  * reported live and does not prevent later work.
  */
-'turn/end': { turn: number; step: number; reason: TurnEndReason }
+'turn/end': { turn: number; reason: TurnEndReason }
 ```
 
 Types: [TurnEndReason](core-data-structures/session.md)