refactor agent pre-step inbox lifecycle

packages/host/apiproxy/README.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 packages/host/apiproxy/README.md
-README.md: cf8cf0aaa7e20436644b92a996b6f7a817b1dd31
-README.zh.md: 91b3d1d0577d4a9a7df97d3c785e28bb21e47fd1
+README.md: 185c20c15c53529c14ad00b38413ffba1d63cfd4
+README.zh.md: ef62ab53e32d564d5041befdb8500189a74a0e05

packages/host/apiproxy/README.md

@@ -20,7 +20,7 @@ Session titles ride the generic projection pair like every other domain — the
 
 Session model routing is a session-domain contract. `session.models` returns the selected provider/model/reasoning target with provider-grouped advisory models, exact-route reasoning metadata, and provider-local lookup failures. `session.selectModel` validates the optional adapter-owned reasoning effort and replaces the complete target selected for the next prompt-assembly boundary. Catalog membership is not validation: an adapter may resolve an unlisted model, while an unavailable route or unsupported effort returns `model-unavailable`.
 
-Pending queued input is a live control-plane contract, not session history. The gateway mirrors queued `InboxItem` occurrences from `agent/inbox/*` and broadcasts authoritative `session/queue` snapshots on every queued change and reconnect; pending steering stays outside this Web projection. `session.updateQueue` addresses one `InboxItemId`: edit replaces pending content and remove discards it. A driver claim wins races by retiring the address before admission; a later operation returns `queue-item-not-found`. The operation queries only an attached Agent and never resumes a cold session because process-local inbox identities do not survive restart or disposal. The client never infers retirement from turn or status events.
+Pending queued input is a live control-plane contract, not conversation history. The gateway derives the complete `next-turn` queue from durable `agent/inbox/spliced` mutations and broadcasts authoritative `session/queue` snapshots after each change and on reconnect; pending `next-step` steering stays outside this Web projection. The message-local `agent/inbox/inserted`, `claimed`, and `discarded` notifications remain available to lifecycle observers but do not build the queue view. `session.updateQueue` addresses one `MessageId`; edit and remove mutate the attached Agent through `Inbox.splice()`. A claim's pure deletion splice wins races before pre-step admission, so a later operation returns `queue-item-not-found`. The operation never resumes a cold session, and the client never infers retirement from turn or status events.
 
 Workspace and Session lists are separate reconnect baselines. `workspace.create` creates a unique name or adopts an existing directory, `workspace.delete` removes only the Workspace registration, `session.create` accepts an optional preallocated Session id, and `host/workspace-changed`, `host/workspace-removed`, plus `host/session-added` carry committed increments in either arrival order. Registration deletion preserves the directory and session logs; its Sessions remain in `session.list` and become Ungrouped. `SessionSummary.blank` and the `host/session-added` frame carry the derived zero-events bit: clients hide blank sessions and reuse them per workspace, flip blank on the first `host/session-status(running:true)`, and treat `session.list` as the reconnect authority; cold summaries are never blank because lazy persistence keeps never-appended sessions out of `list()`.
 

packages/host/apiproxy/README.zh.md

@@ -20,7 +20,7 @@
 
 会话模型路由属于会话领域契约。`session.models` 返回选中的提供方／模型／推理目标，以及按提供方分组的建议性模型、精确路由推理元数据和逐提供方查询失败记录。`session.selectModel` 校验由适配器持有的可选推理强度，并替换将在下一提示词组装边界使用的完整目标。目录成员关系不构成校验：适配器可以解析未列出的模型，而不可用路由或不受支持的推理强度会返回 `model-unavailable`。
 
-待处理的 queued 输入属于实时控制平面契约，而非会话历史。网关镜像来自 `agent/inbox/*` 的 queued `InboxItem` 入队项，并在每次 queued 变更和重连时广播权威的 `session/queue` 快照；待处理 steering（中途引导）不进入此 Web 投影。`session.updateQueue` 通过 `InboxItemId` 寻址单个项：编辑会替换待处理内容，移除会将其丢弃。驱动器在接纳前退役寻址标识，因此认领会赢得竞态；之后的操作返回 `queue-item-not-found`。该操作只查询当前已挂载的 Agent，绝不恢复冷会话，因为进程本地 inbox 标识无法在重启或资源释放后存活。客户端绝不根据轮次或状态事件推断项已退役。
+待处理的 queued 输入属于实时控制平面契约，而非对话历史。网关根据持久 `agent/inbox/spliced` 变更派生完整的 `next-turn` 队列，并在每次变更后及重连时广播权威 `session/queue` 快照；待处理的 `next-step` steering（中途引导）不进入此 Web 投影。面向单条消息的 `agent/inbox/inserted`、`claimed` 与 `discarded` 通知仍供生命周期观察方使用，但不用于构建队列视图。`session.updateQueue` 通过 `MessageId` 寻址单个项；编辑和移除经已挂载 Agent 的 `Inbox.splice()` 修改队列。claim 的纯删除 splice 会在 pre-step 准入前赢得竞态，因此之后的操作返回 `queue-item-not-found`。该操作绝不恢复冷会话，客户端也绝不根据轮次或状态事件推断某项已退出队列。
 
 Workspace 列表与 Session 列表是相互独立的重连基线。`workspace.create` 会创建唯一名称或接纳现有目录，`workspace.delete` 只移除 Workspace 注册记录，`session.create` 接受可选的预分配 Session id，`host/workspace-changed`、`host/workspace-removed` 与 `host/session-added` 则以任意到达顺序携带已提交的增量。删除注册记录会保留目录和会话日志；相关 Session 仍留在 `session.list` 中，并进入 Ungrouped。`SessionSummary.blank` 与 `host/session-added` 帧携带派生的零事件位：客户端隐藏空白会话并按 workspace 复用它们，在首个 `host/session-status(running:true)` 时翻转 blank，并以 `session.list` 作为重连权威；冷会话摘要永远不是空白：惰性持久化让从未追加过事件的会话根本不出现在 `list()` 中。
 

packages/host/apiproxy/tests/api-proxy-commands.spec.ts

@@ -63,7 +63,7 @@ async function harness(options: { commands?: boolean; skills?: boolean } = {}):
 /** Register a live structural agent stub (api-proxy-view precedent: only id/session/status/ctx are read). */
 function stubAgent(ctx: Context, sessionId?: SessionId): Agent {
   const session = ctx.sessions.create(sessionId)
-  const inbox = new Inbox(session)
+  const inbox = new Inbox(session, { inserted: () => {}, discarded: () => {} })
   const agent = {
     id: session.id,
     session,

packages/host/apiproxy/tests/api-proxy-projections.spec.ts

@@ -54,7 +54,7 @@ async function harness(withRegistry: boolean): Promise<{ ctx: Context; session:
   if (withRegistry) await ctx.plugin(SessionProjectionRegistry)
   const session = ctx.sessions.create()
   // The gateway reads both the session and durable inbox baseline.
-  ctx.agents.register({ id: session.id, session, inbox: new Inbox(session), status: 'idle', ctx } as Agent)
+  ctx.agents.register({ id: session.id, session, inbox: new Inbox(session, { inserted: () => {}, discarded: () => {} }), status: 'idle', ctx } as Agent)
   return { ctx, session }
 }
 

packages/host/apiproxy/tests/api-proxy-workspace.spec.ts

@@ -44,7 +44,7 @@ function stubAgent(session: Session): Agent {
     id: session.id,
     options: {},
     session,
-    inbox: new Inbox(session),
+    inbox: new Inbox(session, { inserted: () => {}, discarded: () => {} }),
     status: 'idle',
     ctx: new Context(),
     send: () => {},