docs: rescan rebased documentation hierarchy

packages/context/session-reference/README.i18n.yaml

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 # 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 packages/context/session-reference/README.md
-README.md: 66df45b18df6d859239c8d3216d6c8b9fa61ab23
-README.zh.md: b59a98b86baf88f53429bc2409ad1776b1638736
+README.md: b1c76ef6865d6782941e13c2698fe76e38fb3abd
+README.zh.md: cd083c9d5a49f2bb6e2358bbfbc10d8d299c2783

packages/context/session-reference/README.md

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 English | [中文](README.zh.md)
 
-`ctx.sessionReferences` prepares bounded, read-only snapshots of other sessions as sourced model-facing context. It consumes `ctx.sessionQuery` and the backend-independent compact checkpoint marker; SQLite FTS is not required. The standard TUI bundle mounts it, while other hosts may call the service directly.
+`ctx.sessionReferences` prepares bounded, read-only snapshots of other sessions as sourced model-facing context. It consumes `ctx.sessionQuery` and the backend-independent compact checkpoint marker; SQLite FTS is not required. Hosts that support cross-session mentions may opt into the service.
 
 ## Public API
 
@@ -14,7 +14,7 @@ English | [中文](README.zh.md)
 
 Preparation calls `ctx.sessionQuery.readSurface()` once per distinct source and never rereads it after enqueue. It projects only direct-user `user/message`, direct-user `steering/message`, assistant text, and `user/message` checkpoints carrying the canonical `dsh-compact` source marker from the folded current surface. For a source prompt that already contains baked prefix context, projection reads only its model-hidden display content, preventing recursive snapshot propagation. Shadowed pre-compaction events, tools, reasoning, context, plugin-generated user messages other than marked compact checkpoints, and unfinished assistant chunks are excluded. A compacted source therefore contributes its latest checkpoint plus retained later conversation, not restored shadowed text.
 
-The context source is `{ kind: 'session-reference', version: 1, references }`; each reference records its source id and label, capture seq, compact presence, retained/omitted message counts, omitted UTF-8 bytes, and truncation state. The standard TUI preserves admission ownership without attaching context to the generic inbox record: outside the next-step acceptance window, a one-shot `agent/prompt-submit` wrapper adds the snapshot only to an allowed decision; during prompt admission or an open turn, `inject()` and `steer()` stage beside each other for the same safe boundary. The target log therefore records a sourced context `user/message` followed by the readable direct `user/message` or `steering/message`. Later source mutation, compaction, or deletion cannot change target replay.
+The context source is `{ kind: 'session-reference', version: 1, references }`; each reference records its source id and label, capture seq, compact presence, retained/omitted message counts, omitted UTF-8 bytes, and truncation state. A host captures the snapshot before submitting the associated prompt and appends it as sourced context at the same safe admission boundary. The target log therefore records the snapshot separately from the readable direct message. Later source mutation, compaction, or deletion cannot change target replay.
 
 ## Configuration
 

packages/context/session-reference/README.zh.md

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 [English](README.md) | 中文
 
-`ctx.sessionReferences` 会把其他会话准备为有界、只读快照，作为带来源信息、面向模型的上下文。它消费 `ctx.sessionQuery` 与后端无关的 compact 检查点标记；不需要 SQLite FTS。标准 TUI bundle 会装载它，其他宿主也可直接调用该服务。
+`ctx.sessionReferences` 会把其他会话准备为有界、只读快照，作为带来源信息、面向模型的上下文。它消费 `ctx.sessionQuery` 与后端无关的 compact 检查点标记；不需要 SQLite FTS。支持跨会话 mention 的宿主可以主动启用该服务。
 
 ## 公开 API
 
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 准备阶段会对每个不同源调用一次 `ctx.sessionQuery.readSurface()`，入队后绝不重读。它仅投影折叠后当前表层中的用户直接发出的 `user/message`、用户直接发出的 `steering/message`、assistant 文本，以及 `user/message` 检查点；这类检查点携带规范 `dsh-compact` 源标记。对于已经包含固化前缀上下文的源提示词，投影只读取其对模型隐藏的显示内容，以防止快照递归传播。已遮蔽的压缩（compaction）前事件、工具、推理（reasoning）、上下文、除已标记 compact 检查点外的插件生成 user 消息，以及未完成的 assistant 分片均会被排除。因此，已压缩源只会提供最新检查点及其后保留的会话内容，不会还原已遮蔽的文本。
 
-上下文源为 `{ kind: 'session-reference', version: 1, references }`；每条引用会记录其源 id 与 label、捕获 seq、是否存在 compact、已保留／已省略消息数、已省略 UTF-8 字节数与截断状态。标准 TUI 在不把上下文附加到通用 inbox 记录的情况下保留接纳归属：next-step 接收窗口之外，一次性 `agent/prompt-submit` 包装层只为获准决策添加快照；提示词接纳期间或轮次打开时，`inject()` 与 `steer()` 会并排暂存到同一安全边界。目标日志因此会先记录一条带来源信息的上下文 `user/message`，再记录可读的直接 `user/message` 或 `steering/message`。后续源变更、压缩或删除都无法改变目标回放。
+上下文源为 `{ kind: 'session-reference', version: 1, references }`；每条引用会记录其源 id 与 label、捕获 seq、是否存在 compact、已保留／已省略消息数、已省略 UTF-8 字节数与截断状态。宿主会在提交关联提示词之前捕获快照，并在同一安全接纳边界把它追加为带来源信息的上下文。因此，目标日志会把快照与可读的直接消息分开记录。后续源变更、压缩或删除都无法改变目标回放。
 
 ## 配置