Merge remote-tracking branch 'origin/worktree-process-service-seam' into subprocess-simpl/d-one-env-channel

# Conflicts:
#	docs/cordis-catalog/services.md
#	docs/core-data-structures/subprocess.i18n.yaml
#	packages/lsp/lsp-local/src/connection.ts
#	packages/subagent/subagent-acp/README.i18n.yaml
#	packages/subprocess/subprocess-local/README.i18n.yaml
#	packages/subprocess/subprocess-local/src/spawn.ts
#	packages/subprocess/subprocess/README.i18n.yaml
#	packages/subprocess/subprocess/README.md
#	packages/subprocess/subprocess/README.zh.md
#	packages/subprocess/subprocess/tests/service.spec.ts

.agents/notes/implemented/architecture/2026-07-26-subprocess-consumer-migration.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
-2026-07-26-subprocess-consumer-migration.md: 805f27ba2e72a7f29d1b32053add95b8c33a62e2
-2026-07-26-subprocess-consumer-migration.zh.md: 41bdf04bc03517cf9fe10a61a565e442ecee5520
+2026-07-26-subprocess-consumer-migration.md: b31f69f1251a7219e168ed7800ba16ff7d6b328c
+2026-07-26-subprocess-consumer-migration.zh.md: 47e7519a72f5482f255d15d87b483e9295f6cd2c

.agents/notes/implemented/architecture/2026-07-26-subprocess-consumer-migration.md

@@ -14,10 +14,10 @@ The seam's vocabulary is now Node-shaped, and every spawner that can ride the se
 
 - **Per-stream stdio dispositions** on `SubprocessSpawnSpec`: `'pipe'` (the raw `Readable`/`Writable`, for consumer-owned protocol framing), `'inherit'` (diagnostics to the parent's stream), and collect mode `{ maxBytes, spill? }` — the original bounded tail-keep shape, with the spill file now optional so a diagnostic tail (a language server's stderr) buffers without touching disk. stdin is `'ignore'`, `'pipe'`, or `{ data }` (write-and-close batch).
 - **`SubprocessOutcome` carries exit facts only** (Node's close-event vocabulary); collected output stays readable through `handle.collected` after settlement (spill fds seal at the settle boundary), so batch and streaming callers share one access path and nothing is copied into the outcome.
-- **Tree-scoped termination, split Node-style**: `kill(signal?)` sends one signal and is a no-op after settlement; `terminate()` owns the SIGTERM→grace→SIGKILL escalation (and serves the spec's abort signal); `waitForExit()` polls tree liveness (POSIX group probe; direct-child boundary on Windows); `dispose(graces)` is the cooperative stdin-EOF→SIGTERM→SIGKILL ladder absorbed from `subagent-subprocess`, memoized per handle. Windows tree termination (`taskkill /T`, injectable) moved in from lsp-local, so tree semantics are platform-correct for every consumer.
+- **Tree-scoped termination behind one verb**: `terminate()` owns the SIGTERM→grace→SIGKILL escalation (serves the spec's abort signal too, and is a no-op once the tree is gone) — the handle exposes no single-signal `kill(signal?)`, so a consumer cannot skip the grace window; `waitForExit()` polls tree liveness (POSIX group probe; direct-child boundary on Windows); Windows tree termination (`taskkill /T`, injectable) moved in from lsp-local, so tree semantics are platform-correct for every consumer. (The stdin-EOF-first dispose ladder initially absorbed from `subagent-subprocess` later moved back out to its one consumer — see the [ladder-ownership Agent Note](2026-07-27-dispose-ladder-to-consumer.md).)
 - **One scrub definition**: `scrubbedParentEnv()`/`SENSITIVE_ENV_PATTERN` live on the seam. Spawners that cannot route the spawn itself through the service — pty-local (node-pty owns the fork) and mcp-client (the MCP SDK owns the transport spawn) — import the function, so environment policy is single-sourced even where process ownership is not; the SDK helper's `scrubEnvironment()` defaults through it as well.
 
-Migrations landed with the reshape: **bash-local/bash-sandbox** (collect modes + batch stdin; the bash `kill()` maps to `terminate()` so `task_kill` keeps escalation semantics), **lsp-local** (piped protocol streams + a no-spill collected stderr tail; `LspConnection` takes the seam's spawn function; its private tree-op helpers deleted), **subagent-acp** (piped ndjson streams + inherited stderr; spawn failure surfaces through `done` rejection into the same startup race; disposal is `handle.dispose` with the plugin's configured graces). **`dsh-subagent-subprocess` is deleted** — the dispose ladder and scrub are the seam's; the unused isolated-config-dir helper died with it (no consumer existed).
+Migrations landed with the reshape: **bash-local/bash-sandbox** (collect modes + batch stdin; the bash `kill()` maps to `terminate()` so `task_kill` keeps escalation semantics), **lsp-local** (piped protocol streams + a no-spill collected stderr tail; `LspConnection` takes the seam's spawn function; its private tree-op helpers deleted), **subagent-acp** (piped ndjson streams + inherited stderr; spawn failure surfaces through `done` rejection into the same startup race; disposal is the backend-owned `disposeAcpChild` ladder over the seam's verbs, with the plugin's configured graces). **`dsh-subagent-subprocess` is deleted** — the dispose ladder and scrub are the seam's; the unused isolated-config-dir helper died with it (no consumer existed).
 
 Compositions mounting lsp-local or subagent-acp now load `dsh-subprocess-local` (the plugins inject `'subprocess'`); the acp/lsp test fixtures gained the row.
 
@@ -33,6 +33,6 @@ Compositions mounting lsp-local or subagent-acp now load `dsh-subprocess-local`
 
 ## Consequences
 
-Bought: one implementation of tree signalling, escalation, the dispose ladder, bounded collection, and the scrub, tested once in `dsh-subprocess-local`'s suites (including injected-platform Windows coverage that lsp-local's private copy never had); lsp-local and subagent-acp shed their process plumbing and their children now survive plugin reloads and die with composition teardown like bash's; a whole package (`dsh-subagent-subprocess`) is gone. The seam README's "one consumer family" limitation is retired.
+Bought: one implementation of tree signalling, escalation, bounded collection, and the scrub, tested once in `dsh-subprocess-local`'s suites (including injected-platform Windows coverage that lsp-local's private copy never had); lsp-local and subagent-acp shed their process plumbing and their children now survive plugin reloads and die with composition teardown like bash's; a whole package (`dsh-subagent-subprocess`) is gone. The seam README's "one consumer family" limitation is retired.
 
-Cost: the seam is wider — three stdio modes and four termination verbs instead of one of each — so a future backend implements more surface; the compositions for lsp-local/subagent-acp each carry the subprocess row now; and `SubprocessOutcome` no longer carries output, a breaking shape change inside the still-unreleased stack (the PR2 layer was updated in place rather than shimmed, per the pre-release stance). pty-local/mcp-client/SDK/test-support spawns remain outside the service by ownership, with the scrub as the shared floor.
+Cost: the seam is wider — three stdio modes and the terminate/waitForExit/dispose lifecycle surface instead of one mode and one verb — so a future backend implements more surface; the compositions for lsp-local/subagent-acp each carry the subprocess row now; and `SubprocessOutcome` no longer carries output, a breaking shape change inside the still-unreleased stack (the PR2 layer was updated in place rather than shimmed, per the pre-release stance). pty-local/mcp-client/SDK/test-support spawns remain outside the service by ownership, with the scrub as the shared floor.

.agents/notes/implemented/architecture/2026-07-26-subprocess-consumer-migration.zh.md

@@ -14,10 +14,10 @@ Status: implemented
 
 - **按流划分的 stdio 处置方式（disposition）**，位于 `SubprocessSpawnSpec` 上：`'pipe'`（原始的 `Readable`/`Writable`，供消费方自有的协议分帧使用）、`'inherit'`（诊断输出直通父进程的流），以及收集模式（collect）`{ maxBytes, spill? }`——即最初的有界尾部保留形状，只是 spill 文件改为可选，使诊断尾部（例如语言服务器的 stderr）无需落盘即可缓冲。stdin 则为 `'ignore'`、`'pipe'` 或 `{ data }`（写完即关闭的批量形式）。
 - **`SubprocessOutcome` 只承载退出事实**（Node close 事件的词汇）；收集到的输出在结算后仍可经 `handle.collected` 读取（spill 文件描述符在结算边界封存），因此批量与流式调用方共用一条访问路径，也没有任何内容被复制进这份结果。
-- **以进程树为范围的终止，按 Node 风格拆分**：`kill(signal?)` 只发送一个信号，结算后为空操作；`terminate()` 拥有 SIGTERM→宽限期→SIGKILL 升级（并承接 spec 的 abort 信号）；`waitForExit()` 轮询进程树存活状态（POSIX 进程组探测；Windows 上以直接子进程为界）；`dispose(graces)` 是从 `subagent-subprocess` 吸收来的协作式 stdin EOF→SIGTERM→SIGKILL 阶梯，按句柄 memoize 化。Windows 进程树终止（`taskkill /T`，可注入）自 lsp-local 迁入，因此每个消费方拿到的进程树语义在各平台上都正确。
+- **以进程树为范围的终止，集中在一个动词后面**：`terminate()` 拥有 SIGTERM→宽限期→SIGKILL 升级（也承接 spec 的 abort 信号，进程树消亡后为空操作）——句柄不暴露单信号的 `kill(signal?)`，因此消费方无法跳过宽限窗口；`waitForExit()` 轮询进程树存活状态（POSIX 进程组探测；Windows 上以直接子进程为界）。Windows 进程树终止（`taskkill /T`，可注入）自 lsp-local 迁入，因此每个消费方拿到的进程树语义在各平台上都正确。（最初从 `subagent-subprocess` 吸收的以 stdin EOF 打头的 dispose 阶梯，后来又移回其唯一消费方——见[阶梯归属 Agent Note](2026-07-27-dispose-ladder-to-consumer.md)。）
 - **凭据清除只有一份定义**：`scrubbedParentEnv()`/`SENSITIVE_ENV_PATTERN` 定义在 seam 上。无法把 spawn 本身路由到该服务的调用点——pty-local（node-pty 拥有 fork）与 mcp-client（MCP SDK 拥有传输层的 spawn）——改为导入该函数，因此即便进程所有权无法统一，环境策略仍是单一来源；SDK helper 的 `scrubEnvironment()` 默认同样委托给它。
 
-各项迁移随这次重塑一并落地：**bash-local/bash-sandbox**（收集模式 + 批量 stdin；bash 的 `kill()` 映射到 `terminate()`，因此 `task_kill` 保有升级语义），**lsp-local**（管道化的协议流 + 无 spill 的 stderr 收集尾部；`LspConnection` 改为接收 seam 的 spawn 函数；其私有的进程树操作辅助函数已删除），**subagent-acp**（管道化的 ndjson 流 + inherit 的 stderr；spawn 失败经 `done` 的 reject 汇入同一个启动竞态；dispose 就是携带插件所配置宽限期的 `handle.dispose` 调用）。**`dsh-subagent-subprocess` 已删除**——dispose 阶梯与凭据清除归 seam 所有；无人使用的隔离配置目录辅助函数随之消亡（其消费方本就不存在）。
+各项迁移随这次重塑一并落地：**bash-local/bash-sandbox**（收集模式 + 批量 stdin；bash 的 `kill()` 映射到 `terminate()`，因此 `task_kill` 保有升级语义），**lsp-local**（管道化的协议流 + 无 spill 的 stderr 收集尾部；`LspConnection` 改为接收 seam 的 spawn 函数；其私有的进程树操作辅助函数已删除），**subagent-acp**（管道化的 ndjson 流 + inherit 的 stderr；spawn 失败经 `done` 的 reject 汇入同一个启动竞态；dispose 是后端自有的 `disposeAcpChild` 阶梯，经由 seam 的动词运行，携带插件所配置的宽限期）。**`dsh-subagent-subprocess` 已删除**——dispose 阶梯与凭据清除归 seam 所有；无人使用的隔离配置目录辅助函数随之消亡（其消费方本就不存在）。
 
 挂载 lsp-local 或 subagent-acp 的组合如今都加载 `dsh-subprocess-local`（这两个插件注入 `'subprocess'`）；acp/lsp 测试 fixture（测试前置数据）补上了这一行组合配置。
 
@@ -33,6 +33,6 @@ Status: implemented
 
 ## 后果
 
-换来的是：进程树信号发送、升级、dispose 阶梯、有界收集与凭据清除各自只剩一份实现，且只在 `dsh-subprocess-local` 的测试套件中测试一次（其中包括 lsp-local 的私有副本从未有过的、以注入平台方式实现的 Windows 覆盖）；lsp-local 与 subagent-acp 卸下了自己的进程管道，其子进程如今像 bash 的一样，在插件重载后存活、随组合拆除而终止；一个完整的包（`dsh-subagent-subprocess`）就此消失。seam README 中「只有一个消费方家族」的限制说明也随之退役。
+换来的是：进程树信号发送、升级、有界收集与凭据清除各自只剩一份实现，且只在 `dsh-subprocess-local` 的测试套件中测试一次（其中包括 lsp-local 的私有副本从未有过的、以注入平台方式实现的 Windows 覆盖）；lsp-local 与 subagent-acp 卸下了自己的进程管道，其子进程如今像 bash 的一样，在插件重载后存活、随组合拆除而终止；一个完整的包（`dsh-subagent-subprocess`）就此消失。seam README 中「只有一个消费方家族」的限制说明也随之退役。
 
-代价是：这道 seam 变宽了（stdio 模式从一种变为三种、终止动词从一个变为四个），未来的后端因此要实现更宽的表面；lsp-local/subagent-acp 的各组合如今都多出 subprocess 这一行组合配置；`SubprocessOutcome` 也不再承载输出，这是仍未发布的堆叠变更内部的一次破坏性形状变更（依照预发布立场，PR2 那一层被就地更新，而非加 shim）。pty-local/mcp-client/SDK/test-support 的 spawn 因所有权归属留在该服务之外，以凭据清除作为共享底线。
+代价是：这道 seam 变宽了（stdio 模式从一种变为三种、终止动词换成 terminate/waitForExit/dispose 这组生命周期表面），未来的后端因此要实现更宽的表面；lsp-local/subagent-acp 的各组合如今都多出 subprocess 这一行组合配置；`SubprocessOutcome` 也不再承载输出，这是仍未发布的堆叠变更内部的一次破坏性形状变更（依照预发布立场，PR2 那一层被就地更新，而非加 shim）。pty-local/mcp-client/SDK/test-support 的 spawn 因所有权归属留在该服务之外，以凭据清除作为共享底线。

.agents/notes/implemented/architecture/2026-07-27-dispose-ladder-to-consumer.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
+2026-07-27-dispose-ladder-to-consumer.md: 97b551ff509e3b424f6bf5725939cf54acc961a7
+2026-07-27-dispose-ladder-to-consumer.zh.md: b6849ad393737f2fef06e2007991583b12a04d7a

.agents/notes/implemented/architecture/2026-07-27-dispose-ladder-to-consumer.md

@@ -0,0 +1,23 @@
+# Agent Note: The dispose ladder belongs to its consumer, not the subprocess seam
+
+Status: implemented
+
+English | [中文](2026-07-27-dispose-ladder-to-consumer.zh.md)
+
+## Problem
+
+`SubprocessHandle.dispose(graces)` and `SubprocessDisposeGraces` put a full teardown *policy* — stdin-EOF wait, then SIGTERM, then SIGKILL, each tier bounded by a caller-supplied window — on a seam whose other verbs are single mechanisms. Only one consumer ever called it (the ACP subagent backend); bash rides `terminate()` and service teardown, and the LSP host runs its own protocol-first shutdown. Every future backend nonetheless had to implement the ladder to satisfy the interface, and the implementation carried a `dsh-timeout` dependency solely for the ladder's tier bounds.
+
+## Decision
+
+The ladder moves to its one consumer. `dsh-subagent-acp` owns `disposeAcpChild(child, eofGraceMs, graceMs)`, built entirely on the seam's public verbs: close `stdin`, bound a `waitForExit` on `eofGraceMs`, then `terminate()` (whose SIGTERM→spec-grace→SIGKILL escalation already encodes the signal tiers), then a final bounded whole-tree wait that throws if survivors remain. The seam keeps `kill`/`terminate`/`waitForExit` — mechanisms, not policy — and `waitForExit(signal?)` is exactly the quiescence probe a consumer ladder needs to hold each tier on real tree exit. `dsh-subprocess-local` drops its `dsh-timeout` dependency; the seam's handle loses one method and one exported interface.
+
+## Alternatives considered
+
+**Keep the ladder on the handle as a convenience.** Rejected: a seam method every implementation must provide is not a convenience, it is contract surface — and this one encodes one consumer's cooperation shape (stdin-EOF-first) as if it were process vocabulary. The seam's own README already had to caveat that children quiescing on other signals need "their own tier-1", which is the admission that the ladder is policy.
+
+**Move the ladder to a shared helper package.** Rejected: one consumer. A second out-of-process backend with the same stdin-EOF cooperation shape can lift `disposeAcpChild` to shared code when it exists; extracting now would recreate `dsh-subagent-subprocess`, the single-purpose library this stack just deleted.
+
+## Consequences
+
+Bought: the seam is one method and one type smaller; implementations owe four verbs and no teardown policy; `dsh-subprocess-local` loses a dependency; the ladder's tier windows live beside the config fields that tune them. Cost: a future backend wanting EOF-first teardown writes ~20 lines against the verbs (or lifts the ACP helper); the ladder's tier-tier tests moved from the seam suite to the ACP suite, and the seam suite pins the verbs the ladder composes (bounded `waitForExit` false-then-true across an escalation) instead of the composed policy.

.agents/notes/implemented/architecture/2026-07-27-dispose-ladder-to-consumer.zh.md

@@ -0,0 +1,23 @@
+# Agent Note: dispose 阶梯归其消费方所有，而非 subprocess seam
+
+Status: implemented
+
+[English](2026-07-27-dispose-ladder-to-consumer.md) | 中文
+
+## 问题
+
+`SubprocessHandle.dispose(graces)` 与 `SubprocessDisposeGraces` 把一整套拆卸*策略*——等待 stdin EOF、再 SIGTERM、再 SIGKILL，每一层由调用方提供的时间窗约束——放在了一个其余动词均为单一机制的 seam 上。它始终只有一个调用方（ACP subagent 后端）；bash 走 `terminate()` 与服务拆卸，LSP 主机运行自己的协议优先关闭流程。然而每个未来后端都必须实现该阶梯才能满足接口，实现包也仅为阶梯的层级时限背上了 `dsh-timeout` 依赖。
+
+## 决策
+
+阶梯移入其唯一消费方。`dsh-subagent-acp` 拥有 `disposeAcpChild(child, eofGraceMs, graceMs)`，完全构建在 seam 的公开动词之上：关闭 `stdin`，以 `eofGraceMs` 约束一次 `waitForExit`，随后 `terminate()`（其 SIGTERM→spec 宽限期→SIGKILL 升级已编码了信号层级），最后进行有界的整树等待，若仍有存活进程则抛出。seam 保留 `kill`／`terminate`／`waitForExit`——机制而非策略——而 `waitForExit(signal?)` 恰是消费方阶梯在每一层确认进程树真正退出所需的停稳探针。`dsh-subprocess-local` 卸下 `dsh-timeout` 依赖；seam 的句柄少了一个方法和一个导出接口。
+
+## 曾考虑的替代方案
+
+**把阶梯作为便利方法留在句柄上。**否决：一个每个实现都必须提供的 seam 方法不是便利，而是契约表面——而这一个把某一消费方的配合形状（stdin EOF 打头）当作进程词汇来编码。seam 自己的 README 早已不得不加注「依赖其他信号停稳的子进程需要自己的第一阶」，这本身就是承认该阶梯是策略。
+
+**把阶梯移到共享辅助包。**否决：只有一个消费方。当第二个具有相同 stdin EOF 配合形状的进程外后端出现时，可以再把 `disposeAcpChild` 提升为共享代码；现在抽取只会重造 `dsh-subagent-subprocess`——这组堆叠变更刚刚删掉的那个单一用途库。
+
+## 后果
+
+买到的：seam 少了一个方法和一个类型；实现只欠四个动词，不欠拆卸策略；`dsh-subprocess-local` 少了一个依赖；阶梯的层级时间窗与调节它们的配置字段住在一起。代价：未来想要 EOF 打头拆卸的后端需针对这些动词写约 20 行（或直接搬 ACP 的辅助函数）；阶梯的层级测试从 seam 套件移入 ACP 套件，seam 套件转而钉住阶梯所组合的动词（升级前后有界 `waitForExit` 先假后真），而非组合后的策略。

docs/cordis-catalog/services.md

@@ -1567,7 +1567,7 @@ Implementations must honor these semantics:
 
 - spawn returns immediately with a live handle; `done` resolves at process close with exit facts and rejects only for spawn-level failures.
 - Collect-mode readers are offset-based and non-consuming, so independent readers never consume one another's output; lossy reads report truncation and the spill file holding the complete stream when one exists. Piped streams are handed to the caller raw and never buffered here.
-- SubprocessHandle.kill signals without escalation, SubprocessHandle.terminate (and the spec's abort signal) escalates SIGTERM→grace→SIGKILL, and SubprocessHandle.dispose runs the cooperative EOF-first ladder — all tree-scoped on every platform.
+- SubprocessHandle.terminate (and the spec's abort signal) escalates SIGTERM→grace→SIGKILL — the only termination verb — tree-scoped on every platform. SubprocessHandle.waitForExit observes whole-tree liveness, so a consumer-owned teardown ladder can hold each tier on real quiescence.
 - Disposal of the service terminates all still-running managed processes and awaits their exit.
 
 ```ts cordis-catalog
@@ -1582,7 +1582,7 @@ abstract spawn(spec: SubprocessSpawnSpec): SubprocessHandle
 
 Types: [SubprocessHandle](../core-data-structures/subprocess.md) · [SubprocessSpawnSpec](../core-data-structures/subprocess.md)
 
-Source: [`packages/subprocess/subprocess/src/index.ts:89`](../../packages/subprocess/subprocess/src/index.ts)
+Source: [`packages/subprocess/subprocess/src/index.ts:88`](../../packages/subprocess/subprocess/src/index.ts)
 
 ## `ctx.systemPrompt` — `SystemPrompt`
 

docs/core-data-structures/subprocess.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
-subprocess.md: db4ab49ea953bfcf9ae59ede3187795eb71f0268
-subprocess.zh.md: 3f0a6c798056865ead1352f87328fb9dad6d5c0f
+subprocess.md: 922e7ad0ee8b5c0dbcd0a6a4553c9d2a580f3ee2
+subprocess.zh.md: 5befdcdfc9b0e1d2a9adc825b177c90e53269def

docs/core-data-structures/subprocess.md

@@ -127,7 +127,7 @@ interface SubprocessSpawnSpec {
 
 ## Handles: streams, readers, and tree-scoped termination
 
-A spawn returns a live handle immediately. Collect-mode readers take whole-stream byte offsets and never consume, so independent readers cannot steal one another's deltas; piped streams belong to the caller. Termination is tree-scoped on every platform: `kill(signal)` sends one signal Node-style, `terminate()` escalates SIGTERM→grace→SIGKILL, `waitForExit()` observes the whole tree, and `dispose(graces)` runs the cooperative stdin-EOF→SIGTERM→SIGKILL ladder out-of-process children need.
+A spawn returns a live handle immediately. Collect-mode readers take whole-stream byte offsets and never consume, so independent readers cannot steal one another's deltas; piped streams belong to the caller. Termination is tree-scoped on every platform: `terminate()` — the only termination verb — escalates SIGTERM→grace→SIGKILL, and `waitForExit()` observes the whole tree — enough for a consumer to build its own teardown ladder (the ACP backend's stdin-EOF-first `disposeAcpChild` is the template).
 
 ```ts type-equiv
 /**
@@ -152,17 +152,11 @@ interface SubprocessHandle {
   readonly collected: SubprocessCollectedOutputs
   /** Resolves at process close with exit facts; rejects only for spawn-level failures. */
   readonly done: Promise<SubprocessOutcome>
-  /**
-   * Send one signal to the process tree, Node-style — no escalation, no
-   * timers. A no-op after the outcome has settled (the pid may be reused).
-   * @param signal - the signal to deliver (default `SIGTERM`; Windows
-   *   force-terminates the tree for any value).
-   */
-  kill(signal?: NodeJS.Signals): void
   /**
    * Begin the SIGTERM → `graceMs` → SIGKILL escalation on the process tree
-   * (Windows force-terminates immediately). Idempotent; also triggered by the
-   * spec's abort signal.
+   * (Windows force-terminates immediately) — the seam's only termination
+   * verb. Idempotent, a no-op once the tree is gone (the pid may be reused),
+   * and also triggered by the spec's abort signal.
    */
   terminate(): void
   /**
@@ -172,15 +166,6 @@ interface SubprocessHandle {
    * @returns `true` when the tree exited, `false` when the signal aborted first.
    */
   waitForExit(signal?: AbortSignal): Promise<boolean>
-  /**
-   * Tear the child down to quiescence, resolving only after exit: close stdin
-   * (when this handle owns a piped one) and allow cooperative flush for
-   * `eofGraceMs`, then SIGTERM with a `graceMs` window (POSIX), then forced
-   * tree termination with a final bounded `graceMs` wait.
-   * @param graces - the ladder's two windows, from the consumer's Config.
-   * @throws when the child still has not exited `graceMs` after the forced tier.
-   */
-  dispose(graces: SubprocessDisposeGraces): Promise<void>
 }
 ```
 
@@ -228,31 +213,6 @@ interface SubprocessCollectedOutputs {
 }
 ```
 
-```ts type-equiv
-/**
- * The two grace periods of the cooperative dispose ladder
- * ({@link SubprocessHandle.dispose}). Consumers carry them as defaulted,
- * validated Config fields, so teardown timing is deployment-tunable and this
- * seam hardcodes nothing.
- */
-interface SubprocessDisposeGraces {
-  /**
-   * Tier-1 window (ms): after stdin EOF, how long the child gets to quiesce
-   * ON ITS OWN — flush durable state, tear down its own descendants — before
-   * escalation to platform termination. Usually WIDER than
-   * {@link SubprocessDisposeGraces.graceMs}: a cooperative child's EOF-driven
-   * teardown may itself wait on a signal-trapping grandchild plus a final
-   * flush.
-   */
-  eofGraceMs: number
-  /**
-   * Termination confirmation window (ms): POSIX applies it after `SIGTERM`
-   * and again after `SIGKILL`; Windows applies it after the forced tree
-   * termination.
-   */
-  graceMs: number
-}
-```
 
 ## Outcomes carry exit facts only
 

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

@@ -127,7 +127,7 @@ interface SubprocessSpawnSpec {
 
 ## 句柄：流、读取器与以进程树为范围的终止
 
-spawn 会立即返回一个实时句柄。收集模式的读取器接受全流字节偏移量且从不消费，因此独立的读取器不会抢走彼此的增量；管道化的流归调用方所有。终止在每个平台上都以进程树为范围：`kill(signal)` 以 Node 风格只发送一个信号，`terminate()` 执行 SIGTERM→宽限期→SIGKILL 升级，`waitForExit()` 观察整棵进程树，`dispose(graces)` 运行进程外子进程所需的协作式 stdin EOF→SIGTERM→SIGKILL 阶梯。
+spawn 会立即返回一个实时句柄。收集模式的读取器接受全流字节偏移量且从不消费，因此独立的读取器不会抢走彼此的增量；管道化的流归调用方所有。终止在每个平台上都以进程树为范围：`terminate()`（唯一的终止动词）执行 SIGTERM→宽限期→SIGKILL 升级，`waitForExit()` 观察整棵进程树——这足以让消费方构建自己的拆卸阶梯（ACP 后端以 stdin EOF 打头的 `disposeAcpChild` 即是模板）。
 
 ```ts type-equiv
 /**
@@ -152,17 +152,11 @@ interface SubprocessHandle {
   readonly collected: SubprocessCollectedOutputs
   /** Resolves at process close with exit facts; rejects only for spawn-level failures. */
   readonly done: Promise<SubprocessOutcome>
-  /**
-   * Send one signal to the process tree, Node-style — no escalation, no
-   * timers. A no-op after the outcome has settled (the pid may be reused).
-   * @param signal - the signal to deliver (default `SIGTERM`; Windows
-   *   force-terminates the tree for any value).
-   */
-  kill(signal?: NodeJS.Signals): void
   /**
    * Begin the SIGTERM → `graceMs` → SIGKILL escalation on the process tree
-   * (Windows force-terminates immediately). Idempotent; also triggered by the
-   * spec's abort signal.
+   * (Windows force-terminates immediately) — the seam's only termination
+   * verb. Idempotent, a no-op once the tree is gone (the pid may be reused),
+   * and also triggered by the spec's abort signal.
    */
   terminate(): void
   /**
@@ -172,15 +166,6 @@ interface SubprocessHandle {
    * @returns `true` when the tree exited, `false` when the signal aborted first.
    */
   waitForExit(signal?: AbortSignal): Promise<boolean>
-  /**
-   * Tear the child down to quiescence, resolving only after exit: close stdin
-   * (when this handle owns a piped one) and allow cooperative flush for
-   * `eofGraceMs`, then SIGTERM with a `graceMs` window (POSIX), then forced
-   * tree termination with a final bounded `graceMs` wait.
-   * @param graces - the ladder's two windows, from the consumer's Config.
-   * @throws when the child still has not exited `graceMs` after the forced tier.
-   */
-  dispose(graces: SubprocessDisposeGraces): Promise<void>
 }
 ```
 
@@ -228,31 +213,6 @@ interface SubprocessCollectedOutputs {
 }
 ```
 
-```ts type-equiv
-/**
- * The two grace periods of the cooperative dispose ladder
- * ({@link SubprocessHandle.dispose}). Consumers carry them as defaulted,
- * validated Config fields, so teardown timing is deployment-tunable and this
- * seam hardcodes nothing.
- */
-interface SubprocessDisposeGraces {
-  /**
-   * Tier-1 window (ms): after stdin EOF, how long the child gets to quiesce
-   * ON ITS OWN — flush durable state, tear down its own descendants — before
-   * escalation to platform termination. Usually WIDER than
-   * {@link SubprocessDisposeGraces.graceMs}: a cooperative child's EOF-driven
-   * teardown may itself wait on a signal-trapping grandchild plus a final
-   * flush.
-   */
-  eofGraceMs: number
-  /**
-   * Termination confirmation window (ms): POSIX applies it after `SIGTERM`
-   * and again after `SIGKILL`; Windows applies it after the forced tree
-   * termination.
-   */
-  graceMs: number
-}
-```
 
 ## 结果只承载退出事实
 

packages/cordis/tool-cordis/src/api-catalog.ts

@@ -2221,13 +2221,9 @@ export const TYPE_API: readonly TypeApiEntry[] = [
     name: 'SubprocessCollectedOutputs',
     declaration: 'export interface SubprocessCollectedOutputs {\n    readonly stdout?: SubprocessOutputReader;\n    readonly stderr?: SubprocessOutputReader;\n}',
   },
-  {
-    name: 'SubprocessDisposeGraces',
-    declaration: 'export interface SubprocessDisposeGraces {\n    eofGraceMs: number;\n    graceMs: number;\n}',
-  },
   {
     name: 'SubprocessHandle',
-    declaration: 'export interface SubprocessHandle {\n    readonly pid: number;\n    readonly stdin: Writable | undefined;\n    readonly stdout: Readable | undefined;\n    readonly stderr: Readable | undefined;\n    readonly collected: SubprocessCollectedOutputs;\n    readonly done: Promise<SubprocessOutcome>;\n    kill(signal?: NodeJS.Signals): void;\n    terminate(): void;\n    waitForExit(signal?: AbortSignal): Promise<boolean>;\n    dispose(graces: SubprocessDisposeGraces): Promise<void>;\n}',
+    declaration: 'export interface SubprocessHandle {\n    readonly pid: number;\n    readonly stdin: Writable | undefined;\n    readonly stdout: Readable | undefined;\n    readonly stderr: Readable | undefined;\n    readonly collected: SubprocessCollectedOutputs;\n    readonly done: Promise<SubprocessOutcome>;\n    terminate(): void;\n    waitForExit(signal?: AbortSignal): Promise<boolean>;\n}',
   },
   {
     name: 'SubprocessOutcome',

packages/lsp/lsp-local/src/connection.ts

@@ -29,11 +29,11 @@ export interface ConnectionSpec {
   /** Largest stderr tail retained for diagnostics. */
   readonly maxStderrBytes: number
   /**
-   * Bound (ms) for draining pipes a surviving helper still holds after the
-   * server exits; the instance passes its kill grace so exit observation is
-   * never slower than the escalation it feeds.
+   * The subprocess spec's `graceMs`: the SIGTERM→SIGKILL window of
+   * {@link LspConnection.terminate}'s escalation, and the bound for draining
+   * pipes a surviving helper still holds after the server exits.
    */
-  readonly pipeDrainGraceMs: number
+  readonly killGraceMs: number
   /** Static answer to every `workspace/configuration` item. */
   readonly configuration: unknown
 }
@@ -97,7 +97,7 @@ export class LspConnection {
         stdout: 'pipe',
         stderr: { maxBytes: spec.maxStderrBytes },
       },
-      graceMs: spec.pipeDrainGraceMs,
+      graceMs: spec.killGraceMs,
       // spec.env mixes the scrubbed base with explicit config entries; the
       // seam merges the whole map after its own ambient scrub, so a
       // configured DSH_* fact reaches the child.
@@ -210,14 +210,9 @@ export class LspConnection {
     return this.nextId
   }
 
-  /** Request termination of the server's process tree (SIGTERM, no escalation). */
+  /** Terminate the server's process tree (the seam's SIGTERM→grace→SIGKILL escalation; idempotent). */
   terminate(): void {
-    this.handle.kill('SIGTERM')
-  }
-
-  /** Force termination of the server's process tree. */
-  kill(): void {
-    this.handle.kill('SIGKILL')
+    this.handle.terminate()
   }
 
   /**
@@ -235,9 +230,10 @@ export class LspConnection {
       messages = this.decoder.push(chunk)
     } catch (error) {
       // A framing/JSON failure corrupts the stream position irrecoverably: fail the instance and
-      // SIGKILL the whole group so helper processes don't outlive the leader.
+      // terminate the whole group so helper processes don't outlive the leader (SIGTERM first, then
+      // the kill grace's SIGKILL — a misbehaving server still gets its bounded flush window).
       this.fail(asError(error))
-      this.handle.kill('SIGKILL')
+      this.handle.terminate()
       return
     }
     for (const message of messages) this.dispatch(message)

packages/lsp/lsp-local/src/index.ts

@@ -285,8 +285,6 @@ class LocalLspProvider implements LspProvider {
       initializationOptions: this.config.initializationOptions,
       maxMessageBytes: this.config.maxMessageBytes,
       maxStderrBytes: this.config.maxStderrBytes,
-      // Exit observation must never be slower than the escalation it feeds.
-      pipeDrainGraceMs: this.config.killGraceMs,
       shutdownTimeoutMs: this.config.shutdownTimeoutMs,
       killGraceMs: this.config.killGraceMs,
     }

packages/lsp/lsp-local/src/instance.ts

@@ -35,17 +35,6 @@ export interface InstanceSpec extends ConnectionSpec {
   readonly initializationOptions: unknown
   /** Graceful `shutdown`/`exit` budget before escalation (ms). */
   readonly shutdownTimeoutMs: number
-  /** SIGTERM→SIGKILL grace after graceful shutdown fails (ms). */
-  readonly killGraceMs: number
-}
-
-/**
- * Force-kill a process tree only when graceful termination did not make it exit.
- * @param treeExited - whether the tree exited within its grace period.
- * @param forceKill - forceful process-tree termination primitive.
- */
-export function escalateProcessTree(treeExited: boolean, forceKill: () => void): void {
-  if (!treeExited) forceKill()
 }
 
 /**
@@ -311,17 +300,14 @@ export class LspInstance {
     await abortable(this.connection.closed, signal)
   }
 
-  /** Terminate the tree, escalate after `killGraceMs`, then await leader and helper exit. */
+  /**
+   * Terminate the tree (the seam escalates SIGTERM→`killGraceMs`→SIGKILL),
+   * then await leader and helper exit. The awaits are unbounded on purpose:
+   * the seam's escalation already committed to SIGKILL, so quiescence — not
+   * another timer — is the postcondition disposal owes its callers.
+   */
   private async forceTerminate(): Promise<void> {
     this.connection.terminate()
-    const graceDeadline = deadline(undefined, this.spec.killGraceMs, 'LSP_KILL_GRACE')
-    let treeExited: boolean
-    try {
-      treeExited = await this.connection.waitForProcessTreeExit(graceDeadline.signal)
-    } finally {
-      graceDeadline[Symbol.dispose]()
-    }
-    escalateProcessTree(treeExited, this.connection.kill.bind(this.connection))
     await Promise.all([
       this.connection.closed,
       this.connection.waitForProcessTreeExit(),

packages/lsp/lsp-local/tests/connection.spec.ts

@@ -14,7 +14,7 @@ let open: LspConnection[] = []
 
 afterEach(async () => {
   for (const conn of open) {
-    conn.kill()
+    conn.terminate()
     await conn.closed
   }
   open = []
@@ -33,7 +33,7 @@ function connect(
     env: { ...scrubbedParentEnv(), ...env },
     maxMessageBytes: 16_000_000,
     maxStderrBytes: 100_000,
-    pipeDrainGraceMs: 3_000,
+    killGraceMs: 3_000,
     configuration: { setting: 42 },
   }, spawnSubprocess, (method, params) => {
     seen?.push({ method, params })
@@ -66,10 +66,10 @@ describe('LspConnection', () => {
     await expect(conn.request('textDocument/hover', {})).rejects.toThrow(/server refused the request/)
   })
 
-  it('treats signaling an already-closed child as a teardown race', async () => {
+  it('treats terminating an already-closed child as a teardown race', async () => {
     const conn = connectScript('')
     await conn.closed
-    expect(() => { conn.kill() }).not.toThrow()
+    expect(() => { conn.terminate() }).not.toThrow()
   })
 
   it('answers a server workspace/configuration request from static config', async () => {
@@ -152,7 +152,7 @@ function connectScript(script: string, maxStderrBytes = 100_000, writer?: Connec
     env: scrubbedParentEnv(),
     maxMessageBytes: 16_000_000,
     maxStderrBytes,
-    pipeDrainGraceMs: 3_000,
+    killGraceMs: 3_000,
     configuration: null,
   }, spawnSubprocess, () => Promise.resolve(null), writer)
   open.push(conn)
@@ -168,7 +168,7 @@ describe('LspConnection edge behavior', () => {
       env: {},
       maxMessageBytes: 1000,
       maxStderrBytes: 1000,
-      pipeDrainGraceMs: 3_000,
+      killGraceMs: 3_000,
       configuration: null,
     }, spawnSubprocess, () => Promise.resolve(null))
     open.push(conn)

packages/lsp/lsp-local/tests/instance.spec.ts

@@ -1,4 +1,4 @@
-import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { afterEach, beforeEach, describe, expect, it } from 'vitest'
 import { mkdtemp, mkdir, readFile, rm, writeFile, realpath } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
@@ -6,7 +6,6 @@ import { pathToFileURL, fileURLToPath } from 'node:url'
 import { LspInstance, readHostSource } from '@deepseek-ai/dsh-lsp-local'
 import { encodeMessage } from '@deepseek-ai/dsh-lsp-local'
 import type { ConnectionWriter } from '@deepseek-ai/dsh-lsp-local/src/connection.ts'
-import { escalateProcessTree } from '@deepseek-ai/dsh-lsp-local/src/instance.ts'
 import type { InstanceSpec } from '@deepseek-ai/dsh-lsp-local/src/instance.ts'
 import type { LspProviderQuery, LspQueryResult } from '@deepseek-ai/dsh-lsp'
 import { scrubbedParentEnv } from '@deepseek-ai/dsh-subprocess'
@@ -45,7 +44,6 @@ function makeInstance(
     initializationOptions: { init: true },
     maxMessageBytes: 16_000_000,
     maxStderrBytes: 100_000,
-    pipeDrainGraceMs: 200,
     shutdownTimeoutMs: 200,
     killGraceMs: 200,
     ...overrides,
@@ -75,7 +73,6 @@ function scriptInstance(script: string, overrides: Partial<InstanceSpec> = {}):
     initializationOptions: null,
     maxMessageBytes: 16_000_000,
     maxStderrBytes: 100_000,
-    pipeDrainGraceMs: 150,
     shutdownTimeoutMs: 150,
     killGraceMs: 150,
     ...overrides,
@@ -258,14 +255,6 @@ describe('LspInstance query and abort', () => {
 })
 
 describe('LspInstance disposal', () => {
-  it('escalates only when the process tree survives its grace period', () => {
-    const forceKill = vi.fn()
-    escalateProcessTree(false, forceKill)
-    expect(forceKill).toHaveBeenCalledOnce()
-    escalateProcessTree(true, forceKill)
-    expect(forceKill).toHaveBeenCalledOnce()
-  })
-
   it('lets a server finish protocol exit before signal escalation', async () => {
     const marker = join(root, 'graceful-exit.log')
     const instance = makeInstance({

packages/subagent/subagent-acp/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
-README.md: 044a4c5a71d32224262acef9e2c849f375198c2c
-README.zh.md: 918df12ea0ea50e6f59b144e74601ff6beacbe86
+README.md: efcc77c442714a83631d009efb712fa7b8f5dfa0
+README.zh.md: 41723398ffa34995282814011cd03b2fc1cc5a4b

packages/subagent/subagent-acp/README.md

@@ -14,7 +14,7 @@ The returned run id is minted in the parent namespace. The child server's sessio
 
 After publication, the provider sends the prompt and collects streamed `agent_message_chunk` text into `SubagentResult.output`. A prompt/transport failure resolves with `stopReason: 'error'`, or `aborted` when the required request signal or disposal requested cancellation.
 
-`dispose()` is idempotent. It removes the signal listener, requests ACP cancellation when possible, closes stdin, and waits `disposeEofGraceMs`. POSIX then escalates through SIGTERM and `disposeGraceMs` before SIGKILL; Windows force-terminates directly because Node maps both signals to `TerminateProcess`. After forced termination, every platform waits at most `disposeGraceMs` for exit and rejects on a signal error or missing exit. Every run uses a fresh process; process pooling is not implemented.
+`dispose()` is idempotent. It removes the signal listener, requests ACP cancellation when possible, then runs this backend's own teardown ladder (`disposeAcpChild`) over the seam's verbs: close stdin and wait `disposeEofGraceMs` for cooperative quiescence, then the handle's `terminate()` escalation (SIGTERM, the spawn grace, SIGKILL — Windows force-terminates directly), then a bounded whole-tree exit wait that rejects if survivors remain. Every run uses a fresh process; process pooling is not implemented.
 
 ## Capabilities and context
 

packages/subagent/subagent-acp/README.zh.md

@@ -14,7 +14,7 @@ ACP（Agent Client Protocol）提供方会在全新的子进程中运行每个 s
 
 发布后，提供方发送提示词，并把流式 `agent_message_chunk` 文本收集到 `SubagentResult.output`。提示词/传输失败会以 `stopReason: 'error'` 兑现；如果必需的请求信号或 dispose 请求了取消，则以 `aborted` 兑现。
 
-`dispose()` 是幂等的。它会移除信号监听器，在可行时请求 ACP 取消，关闭 stdin，并等待 `disposeEofGraceMs`。随后 POSIX 先升级到 SIGTERM，等待 `disposeGraceMs` 后再使用 SIGKILL；Windows 会直接强制终止，因为 Node 会把两个信号都映射到 `TerminateProcess`。强制终止后，各平台最多再等待 `disposeGraceMs` 以确认退出；若信号出错或未退出，则拒绝。每次运行都使用全新进程；尚未实现进程池。
+`dispose()` 是幂等的。它会移除信号监听器，在可行时请求 ACP 取消，然后经由该 seam 的动词运行本后端自有的拆卸阶梯（`disposeAcpChild`）：先关闭 stdin 并等待 `disposeEofGraceMs` 让子进程协作停稳，再触发句柄的 `terminate()` 升级（SIGTERM、spawn 宽限期、SIGKILL——Windows 直接强制终止），最后进行有界的整树退出等待；若仍有存活进程，则拒绝。每次运行都使用全新进程；尚未实现进程池。
 
 ## 能力与上下文
 

packages/subagent/subagent-acp/src/run.ts

@@ -90,6 +90,46 @@ export const DEFAULT_DISPOSE_EOF_GRACE_MS = 6_000
 /** Default POSIX grace between SIGTERM and SIGKILL on dispose (the `disposeGraceMs` config). */
 export const DEFAULT_DISPOSE_GRACE_MS = 3_000
 
+/** Bounded whole-tree exit wait: polls the handle's tree liveness until it exits or `ms` elapses. */
+async function treeExitsWithin(child: SubprocessHandle, ms: number): Promise<boolean> {
+  const controller = new AbortController()
+  const timer = setTimeout(() => { controller.abort() }, ms)
+  try {
+    return await child.waitForExit(controller.signal)
+  } finally {
+    clearTimeout(timer)
+  }
+}
+
+/**
+ * Cooperative teardown ladder for an out-of-process agent, over the seam's
+ * public verbs; resolves only at whole-tree quiescence: stdin EOF (the child's
+ * window to flush persistence and reap its own descendants), then the
+ * terminate() escalation (SIGTERM → spec grace → SIGKILL), then a bounded
+ * confirmation wait.
+ * @param child - the spawned ACP child's handle.
+ * @param eofGraceMs - tier-1 window after stdin EOF.
+ * @param graceMs - confirmation window after the escalation's SIGKILL.
+ * @throws when the tree still has not exited `graceMs` after forced termination.
+ */
+export async function disposeAcpChild(child: SubprocessHandle, eofGraceMs: number, graceMs: number): Promise<void> {
+  // A spawn failure has no process to tear down; observe the rejection so
+  // disposal in a finally block cannot surface it as unhandled.
+  if (child.pid <= 0) {
+    await child.done.catch(() => {})
+    return
+  }
+  child.stdin?.end()
+  if (await treeExitsWithin(child, eofGraceMs)) return
+  // terminate() sends SIGTERM now and SIGKILL after the spawn spec's grace
+  // (this plugin passes disposeGraceMs there), so the bound covers both the
+  // escalation window and an equal confirmation window after the SIGKILL.
+  child.terminate()
+  if (!(await treeExitsWithin(child, graceMs * 2))) {
+    throw new Error('ACP child process tree did not exit within its dispose windows')
+  }
+}
+
 /**
  * Map an ACP {@link StopReason} to a harness {@link SubagentStopReason}.
  * @param reason - the terminal reason from the child's `session/prompt` response.
@@ -195,10 +235,7 @@ export async function startAcpRun(request: SubagentStartRequest, spec: AcpRunSpe
 
   // Startup rollback and the published handle share one process teardown.
   let processDisposal: Promise<void> | undefined
-  const disposeProcess = (): Promise<void> => (processDisposal ??= child.dispose({
-    eofGraceMs: spec.disposeEofGraceMs,
-    graceMs: spec.disposeGraceMs,
-  }))
+  const disposeProcess = (): Promise<void> => (processDisposal ??= disposeAcpChild(child, spec.disposeEofGraceMs, spec.disposeGraceMs))
 
   // Accumulate the child's streamed assistant text — the SubagentResult output.
   const output: string[] = []

packages/subagent/subagent-acp/tests/subagent-acp.spec.ts

@@ -8,7 +8,7 @@ import { fileURLToPath } from 'node:url'
 import SubagentService from '@deepseek-ai/dsh-subagent'
 import type { Agent } from '@deepseek-ai/dsh-agent'
 import * as acp from '../src/index.ts'
-import { acpStopReason, acpContentText, DEFAULT_DISPOSE_EOF_GRACE_MS, DEFAULT_DISPOSE_GRACE_MS, startAcpRun, toAcpPrompt, type AcpRunSpec } from '../src/run.ts'
+import { acpStopReason, acpContentText, DEFAULT_DISPOSE_EOF_GRACE_MS, DEFAULT_DISPOSE_GRACE_MS, disposeAcpChild, startAcpRun, toAcpPrompt, type AcpRunSpec } from '../src/run.ts'
 import LocalSubprocessService from '@deepseek-ai/dsh-subprocess-local'
 import { spawnSubprocess } from '@deepseek-ai/dsh-subprocess-local/src/spawn.ts'
 
@@ -135,6 +135,71 @@ describe('child env layering (through the subprocess seam)', () => {
   })
 })
 
+describe('disposeAcpChild (the backend-owned teardown ladder over seam verbs)', () => {
+  const bash = (command: string, stdin: 'pipe' | 'ignore' = 'pipe') => spawnSubprocess({
+    argv: ['bash', '-c', command],
+    cwd: process.cwd(),
+    stdio: { stdin, stdout: { maxBytes: 1000 }, stderr: { maxBytes: 1000 } },
+    graceMs: 200,
+  })
+
+  it('tier 1: a cooperative child exits on stdin EOF without any signal', async () => {
+    const child = bash('read -r line; exit 0')
+    await disposeAcpChild(child, 5_000, 200)
+    const outcome = await child.done
+    expect(outcome.exitCode).toBe(0)
+    expect(outcome.signal).toBeNull()
+  })
+
+  it('tier 2: an EOF-deaf child dies by the terminate escalation (SIGTERM)', async () => {
+    const child = bash('sleep 60')
+    await disposeAcpChild(child, 100, 5_000)
+    const outcome = await child.done
+    expect(outcome.signal).toBe('SIGTERM')
+  })
+
+  it('tier 3: a TERM-trapping child dies by the escalation SIGKILL', async () => {
+    const child = bash("trap '' TERM; echo armed; sleep 60", 'ignore')
+    // Wait for the trap to arm so SIGTERM cannot race the default handler.
+    while (!child.collected.stdout!.readFrom(0).text.includes('armed')) {
+      await new Promise(resolve => setTimeout(resolve, 10))
+    }
+    await disposeAcpChild(child, 50, 2_000)
+    const outcome = await child.done
+    expect(outcome.signal).toBe('SIGKILL')
+  })
+
+  it('throws when the tree survives even the escalation window', async () => {
+    // A handle whose tree never exits (waitForExit only ever aborts): the
+    // ladder must fail loud instead of resolving over survivors. Built as a
+    // stub because the ladder composes only public verbs.
+    const never: Parameters<typeof disposeAcpChild>[0] = {
+      pid: 1,
+      stdin: undefined,
+      stdout: undefined,
+      stderr: undefined,
+      collected: {},
+      done: new Promise(() => {}),
+      terminate: () => {},
+      waitForExit: (signal?: AbortSignal) => new Promise((resolve) => {
+        signal?.addEventListener('abort', () => { resolve(false) }, { once: true })
+      }),
+    }
+    await expect(disposeAcpChild(never, 20, 20)).rejects.toThrow(/did not exit within its dispose windows/)
+  })
+
+  it('observes a spawn-level rejection and returns without a process to reap', async () => {
+    const child = spawnSubprocess({
+      argv: ['bash', '-c', 'true'],
+      cwd: '/nonexistent-dir-dsh-acp-ladder-test',
+      stdio: { stdin: 'ignore', stdout: { maxBytes: 1000 }, stderr: { maxBytes: 1000 } },
+      graceMs: 200,
+    })
+    await expect(disposeAcpChild(child, 1_000, 1_000)).resolves.toBeUndefined()
+    await expect(child.done).rejects.toThrow()
+  })
+})
+
 describe('cwd resolution', () => {
   it('falls back to the parent session cwd for the child process AND its ACP session', async () => {
     // realpath: on macOS `tmpdir()` sits behind a symlink (/var → /private/var),

packages/subprocess/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
-README.md: 657855aff67230ee22b8137ae3aabc76aff8f860
-README.zh.md: 5281a0d6eddb38974d1225220bab08880224f14b
+README.md: 64e4740c7ac2706e45bb3517891504bf31a6109b
+README.zh.md: e30b6c7f51ed0dffba15a6d1dff632e4ff4c6402

packages/subprocess/README.md

@@ -6,7 +6,7 @@ The shared home for spawning managed child-process trees: fully-specified spawn
 
 | Package | ctx key | Role |
 |---|---|---|
-| [`subprocess`](subprocess/README.md) (`@deepseek-ai/dsh-subprocess`) | `ctx.subprocess` | The seam: abstract `SubprocessService.spawn(spec)`, the fully-explicit `SubprocessSpawnSpec` with per-stream stdio dispositions, `SubprocessHandle` (streams, offset-based readers, kill/terminate/waitForExit/dispose), and the shared scrub + `DSH_*`/`CollectedOutput` vocabulary |
+| [`subprocess`](subprocess/README.md) (`@deepseek-ai/dsh-subprocess`) | `ctx.subprocess` | The seam: abstract `SubprocessService.spawn(spec)`, the fully-explicit `SubprocessSpawnSpec` with per-stream stdio dispositions, `SubprocessHandle` (streams, offset-based readers, terminate/waitForExit/dispose), and the shared scrub + `DSH_*`/`CollectedOutput` vocabulary |
 | [`subprocess-local`](subprocess-local/README.md) (`@deepseek-ai/dsh-subprocess-local`) | — | The local implementation: detached process trees, per-disposition stream wiring, tail-keep truncation with bounded private spill files, the `DSH_*` merge order, tree signalling with escalation, the dispose ladder, and terminate-and-join disposal |
 
 The service owns process lifetime across consumer reloads; consumers own what a process means (a bash command, a future non-shell runner) and every default that shapes one.

packages/subprocess/README.zh.md

@@ -6,7 +6,7 @@ spawn 受管子进程树的共用归属位置：完全显式的 spawn spec，其
 
 | 包（package） | ctx 键 | 角色 |
 |---|---|---|
-| [`subprocess`](subprocess/README.md)（`@deepseek-ai/dsh-subprocess`） | `ctx.subprocess` | seam 本体：抽象的 `SubprocessService.spawn(spec)`、完全显式且带按流划分 stdio 处置方式的 `SubprocessSpawnSpec`、`SubprocessHandle`（流、基于偏移量的读取器、kill/terminate/waitForExit/dispose），以及共享的凭据清除 + `DSH_*`/`CollectedOutput` 词汇 |
+| [`subprocess`](subprocess/README.md)（`@deepseek-ai/dsh-subprocess`） | `ctx.subprocess` | seam 本体：抽象的 `SubprocessService.spawn(spec)`、完全显式且带按流划分 stdio 处置方式的 `SubprocessSpawnSpec`、`SubprocessHandle`（流、基于偏移量的读取器、terminate/waitForExit/dispose），以及共享的凭据清除 + `DSH_*`/`CollectedOutput` 词汇 |
 | [`subprocess-local`](subprocess-local/README.md)（`@deepseek-ai/dsh-subprocess-local`） | 无 | 本地实现：detached 进程树、按处置方式接线的流、附带有界私有 spill 文件的尾部保留截断、`DSH_*` 合并次序、带升级的进程树信号发送、dispose 阶梯，以及先终止再等待退出的 dispose |
 
 服务拥有跨消费方重载的进程存续期；消费方拥有一个进程的含义（一条 bash 命令、未来的非 shell 运行器）以及塑造它的每一项默认值。

packages/subprocess/subprocess-local/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
-README.md: a62929e8ee1c1c852d99d9569f4118bc751e8150
-README.zh.md: 99febdbe54988f54b74dbc2c80251ec1e9e671ef
+README.md: a4e20b5c64afd14cb9dce9f8cc46fa96a1f5f19d
+README.zh.md: 2bd7ebe7c3407a4ad6a86c520594465f7f1e710c

packages/subprocess/subprocess-local/README.md

@@ -6,7 +6,7 @@ Local implementation of the [`@deepseek-ai/dsh-subprocess`](../subprocess/README
 
 ## Behavior (and where it came from)
 
-- **Detached process trees with platform-correct signalling** — POSIX children are spawned `detached` (own process group) and signalled by negative pgid with a direct-child fallback; Windows terminates the tree via `taskkill /PID <pid> /T /F` (injectable for tests). `terminate()` sends SIGTERM then SIGKILL after the spec's grace (OpenCode's escalation; pipelines and subshells die with the parent); `kill(signal)` sends exactly one signal and is a no-op after settlement; `dispose(graces)` runs stdin-EOF → SIGTERM → SIGKILL with caller-supplied windows and one memoized disposal per handle. After the leader exits, still-open pipes receive the same bounded drain grace so a surviving descendant cannot hold the outcome open indefinitely. ESRCH is tolerated; daemons that re-parent away from the group can still survive — the same caveat as the surveyed tools.
+- **Detached process trees with platform-correct signalling** — POSIX children are spawned `detached` (own process group) and signalled by negative pgid with a direct-child fallback; Windows terminates the tree via `taskkill /PID <pid> /T /F` (injectable for tests). `terminate()` — the handle's only termination verb — sends SIGTERM then SIGKILL after the spec's grace (OpenCode's escalation; pipelines and subshells die with the parent) and is a no-op once the tree is gone; `waitForExit()` polls whole-tree liveness so consumer teardown confirms real quiescence. After the leader exits, still-open pipes receive the same bounded drain grace so a surviving descendant cannot hold the outcome open indefinitely. ESRCH is tolerated; daemons that re-parent away from the group can still survive — the same caveat as the surveyed tools.
 - **Per-stream dispositions** — `'pipe'` hands the raw stream to the caller untouched (protocol framing stays consumer-owned); `'inherit'` passes the parent descriptor through; collect mode keeps the in-memory TAIL beyond its cap (errors and results cluster at the end — pi/OpenCode rationale) while the FULL stream is appended to a private temp file when a spill cap is configured — omitting `spill` keeps only the tail, the diagnostic shape. A stream larger than the spill cap discards its now-incomplete spill and returns only the marked truncated tail; spill fds are sealed at settlement, and a failed final close withholds the path rather than advertising an incomplete file. Spill files are `0600` with random names under a lazily-created `0700` per-process directory.
 - **Credential scrub + explicit merge** — `process.env` minus credential-shaped vars (`*KEY*`/`*SECRET*`/`*TOKEN*`) and all ambient `DSH_*` names; the spec's explicit `env` merges after that scrub with no namespace validation, so a deliberately supplied credential or current `DSH_*` fact wins while stale nested-harness identity cannot leak in ambiently. Supplied stdin is written and closed; otherwise fd 0 is `/dev/null`. See the [stdin/env Agent Note](../../../.agents/notes/implemented/architecture/2026-06-30-bash-stdin-env-trusted-plugin-surface.md) and [managed environment Agent Note](../../../.agents/notes/implemented/feature/2026-07-10-agent-session-identity-and-log-location.md).
 - **Offset-based reads** — collect-mode readers return deltas in whole-stream byte coordinates; the service never holds a cursor, so consumer-owned cursors (the bash background read path) and full-stream re-reads coexist, before and after settlement.

packages/subprocess/subprocess-local/README.zh.md

@@ -6,7 +6,7 @@
 
 ## 行为（以及设计来源）
 
-- **带平台正确信号发送的 detached 进程树**：POSIX 子进程使用 `detached` spawn（拥有独立进程组），信号以负 pgid 发送并以直接子进程作为回退；Windows 通过 `taskkill /PID <pid> /T /F` 终止进程树（可为测试注入）。`terminate()` 先发送 SIGTERM，经过 spec 的宽限期后再发送 SIGKILL（沿用 OpenCode 的升级策略；管道与子 shell 会随父进程一起结束）；`kill(signal)` 恰好发送一个信号，结算后为空操作；`dispose(graces)` 以调用方提供的时间窗运行 stdin EOF→SIGTERM→SIGKILL 阶梯，dispose（资源释放）按句柄 memoize 化、只执行一次。组长进程退出后，仍然打开的管道也只获得同样有界的排空宽限期，因此存活的后代进程无法无限期地拖住结果不结算。系统会容忍 ESRCH；脱离该组重新挂载的 daemon 仍可能存活，这与调研工具的局限相同。
+- **带平台正确信号发送的 detached 进程树**：POSIX 子进程使用 `detached` spawn（拥有独立进程组），信号以负 pgid 发送并以直接子进程作为回退；Windows 通过 `taskkill /PID <pid> /T /F` 终止进程树（可为测试注入）。`terminate()`（句柄唯一的终止动词）先发送 SIGTERM，经过 spec 的宽限期后再发送 SIGKILL（沿用 OpenCode 的升级策略；管道与子 shell 会随父进程一起结束），进程树消亡后为空操作；`waitForExit()` 轮询整棵进程树的存活状态，使消费方的拆卸能确认真正的完全停稳。组长进程退出后，仍然打开的管道也只获得同样有界的排空宽限期，因此存活的后代进程无法无限期地拖住结果不结算。系统会容忍 ESRCH；脱离该组重新挂载的 daemon 仍可能存活，这与调研工具的局限相同。
 - **按流划分的处置方式**：`'pipe'` 把原始流原样交给调用方（协议分帧仍归消费方所有）；`'inherit'` 直通父进程的描述符；收集模式（collect）在输出超过上限后于内存中保留尾部（错误与结果通常聚集在末尾，沿用 pi/OpenCode 的理由），并在配置了 spill 上限时把完整流追加到一个私有临时文件；省略 `spill` 则只保留尾部，即诊断尾部的形状。某条流大于 spill 上限时，会丢弃已不完整的 spill，仅返回带截断标记的尾部；spill 文件描述符在结算时封存，最终关闭失败时则不公布路径，以免声称存在不完整的文件。spill 文件权限为 `0600`、名称随机，位于按需延迟创建的 `0700` 每进程目录之下。
 - **凭据清除 + 显式合并**：以 `process.env` 为基础，移除形似凭据的变量（`*KEY*`／`*SECRET*`／`*TOKEN*`）和所有环境中已有的 `DSH_*` 名称；spec 的显式 `env` 在该清除之后合并且不做命名空间校验，因此有意提供的凭据或当前 `DSH_*` 事实会胜出，而陈旧的嵌套 harness 身份无法从环境中隐式漏入。提供的 stdin 会被写入后关闭；否则 fd 0 指向 `/dev/null`。参见 [stdin/env Agent Note（agent 决策记录）](../../../.agents/notes/implemented/architecture/2026-06-30-bash-stdin-env-trusted-plugin-surface.md)与[受管环境 Agent Note](../../../.agents/notes/implemented/feature/2026-07-10-agent-session-identity-and-log-location.md)。
 - **基于偏移量的读取**：收集模式的读取器以全流字节坐标返回增量；服务自身从不持有游标，因此消费方自有的游标（bash 的后台读取路径）与完整流重读可以共存，结算前后皆然。

packages/subprocess/subprocess-local/package.json

@@ -29,13 +29,11 @@
   "peerDependencies": {
     "@deepseek-ai/dsh-invariants": "^0.0.1",
     "@deepseek-ai/dsh-subprocess": "^0.0.1",
-    "@deepseek-ai/dsh-timeout": "^0.0.1",
     "cordis": "^4.0.0-rc.7"
   },
   "devDependencies": {
     "@deepseek-ai/dsh-invariants": "workspace:^",
     "@deepseek-ai/dsh-subprocess": "workspace:^",
-    "@deepseek-ai/dsh-timeout": "workspace:^",
     "cordis": "^4.0.0-rc.7"
   }
 }

packages/subprocess/subprocess-local/src/index.ts

@@ -16,8 +16,8 @@ import type { SpawnInternals } from './spawn.ts'
 /**
  * Local subprocess service: detached process trees, Node-shaped stdio
  * dispositions (raw pipes, inherit, bounded tail-keep collection with spill
- * files), credential-scrubbed environment, tree-scoped signalling with
- * SIGTERM→grace→SIGKILL escalation, and the cooperative dispose ladder.
+ * files), credential-scrubbed environment, and tree-scoped signalling with
+ * SIGTERM→grace→SIGKILL escalation.
  */
 export class LocalSubprocessService extends SubprocessService {
   /** Live handles retained only so disposal can terminate and join them. */

packages/subprocess/subprocess-local/src/spawn.ts

@@ -1,10 +1,9 @@
 /**
  * Process plumbing for the local subprocess service: detached process-tree
  * spawn with per-stream stdio dispositions, tail-keep collection with spill
- * files, tree-scoped signalling (POSIX groups; Windows taskkill), the
- * SIGTERM→SIGKILL escalation, and the cooperative EOF-first dispose ladder.
- * This layer reacts to an abort signal; callers own deadlines and classify
- * causes.
+ * files, tree-scoped signalling (POSIX groups; Windows taskkill), and the
+ * SIGTERM→SIGKILL escalation. This layer reacts to an abort signal; callers
+ * own deadlines, teardown ladders, and cause classification.
  * @module dsh-subprocess-local/spawn
  */
 
@@ -15,12 +14,10 @@ import { closeSync, mkdtempSync, openSync, unlinkSync, writeSync } from 'node:fs
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import { setTimeout as sleepMs } from 'node:timers/promises'
-import { deadline } from '@deepseek-ai/dsh-timeout'
 import { scrubbedParentEnv } from '@deepseek-ai/dsh-subprocess'
 import type {
   CollectedOutput,
   SubprocessCollect,
-  SubprocessDisposeGraces,
   SubprocessHandle,
   SubprocessOutcome,
   SubprocessOutputMode,
@@ -48,9 +45,6 @@ export interface SpawnInternals {
   platform?: NodeJS.Platform
 }
 
-/** Timeout code marking a dispose-ladder tier bound (vs an external abort). */
-const DISPOSE_TIER_TIMEOUT = 'SUBPROCESS_DISPOSE_TIER'
-
 /**
  * Liveness-poll cadence for tree-exit waits. The timer stays ref'd: an
  * awaited teardown must keep the event loop alive until the tree really
@@ -377,11 +371,12 @@ export function spawnSubprocess(spec: SubprocessSpawnSpec, internals: SpawnInter
     }
   }
 
-  const kill = (sig: NodeJS.Signals = 'SIGTERM'): void => {
-    // Guard on TREE liveness, not outcome settlement: a TERM-trapping helper
-    // can outlive the settled direct child and must stay signalable, while a
-    // fully-dead tree (possible pid reuse) must not be re-signalled from a
-    // caller's finally block.
+  // The escalation's tier primitive (not on the handle — terminate() is the
+  // only consumer-facing termination verb). Guards on TREE liveness, not
+  // outcome settlement: a TERM-trapping helper can outlive the settled direct
+  // child and must stay signalable, while a fully-dead tree (possible pid
+  // reuse) must not be re-signalled by a later tier.
+  const kill = (sig: NodeJS.Signals): void => {
     if (!treeAlive()) return
     signalTree(platform, pid, sig, child, taskkill)
   }
@@ -389,15 +384,13 @@ export function spawnSubprocess(spec: SubprocessSpawnSpec, internals: SpawnInter
   const terminate = (): void => {
     if (graceTimer !== undefined) return // escalation already in flight
     if (!treeAlive()) return
-    signalTree(platform, pid, 'SIGTERM', child, taskkill)
+    kill('SIGTERM')
     // The escalation must survive direct-child settlement — the leader dying
     // does not mean the tree died — so settle does not clear this timer, and
-    // it re-probes tree liveness before force-killing. It stays ref'd: the
-    // pending SIGKILL is a commitment, and a parent exiting before it fires
-    // would orphan a trapped survivor. Self-bounds at graceMs.
-    graceTimer = setTimeout(() => {
-      if (treeAlive()) signalTree(platform, pid, 'SIGKILL', child, taskkill)
-    }, spec.graceMs)
+    // kill() re-probes tree liveness before force-killing. It stays ref'd:
+    // the pending SIGKILL is a commitment, and a parent exiting before it
+    // fires would orphan a trapped survivor. Self-bounds at graceMs.
+    graceTimer = setTimeout(() => { kill('SIGKILL') }, spec.graceMs)
   }
 
   // The caller owns timeout classification; this layer only reacts to abort.
@@ -454,39 +447,6 @@ export function spawnSubprocess(spec: SubprocessSpawnSpec, internals: SpawnInter
     return true
   }
 
-  /**
-   * Wait, bounded, for whole-tree exit — the dispose ladder's quiescence test.
-   * Tree liveness, not direct-child settlement: a TERM-trapping helper that
-   * outlives the leader must hold the ladder on its tier until it exits.
-   */
-  const treeExitsWithin = async (ms: number): Promise<boolean> => {
-    using bound = deadline(undefined, ms, DISPOSE_TIER_TIMEOUT)
-    return await waitForExit(bound.signal)
-  }
-
-  let disposal: Promise<void> | undefined
-  const dispose = (graces: SubprocessDisposeGraces): Promise<void> => (disposal ??= (async () => {
-    // A spawn failure has no process to tear down; observe the rejection so
-    // disposal in a finally block cannot surface it as unhandled.
-    if (pid <= 0) {
-      await done.catch(() => {})
-      return
-    }
-    // 1. Close a piped stdin and allow cooperative teardown and flush.
-    if (stdinMode === 'pipe') child.stdin?.end()
-    if (await treeExitsWithin(graces.eofGraceMs)) return
-    // 2. POSIX gets a catchable graceful signal; Windows taskkill force-terminates.
-    if (platform !== 'win32') {
-      kill('SIGTERM')
-      if (await treeExitsWithin(graces.graceMs)) return
-    }
-    // 3. Force-kill the tree and await a bounded exit edge.
-    kill('SIGKILL')
-    if (!(await treeExitsWithin(graces.graceMs))) {
-      throw new Error(`child process tree did not exit within ${graces.graceMs}ms after forced termination`)
-    }
-  })())
-
   return {
     pid,
     /* v8 ignore start -- pipe-mode fds exist on every spawn Node returns; the null-coalesces guard a nonconforming ChildProcess only. */
@@ -499,9 +459,7 @@ export function spawnSubprocess(spec: SubprocessSpawnSpec, internals: SpawnInter
       ...stderrCollector !== undefined ? { stderr: stderrCollector } : {},
     },
     done,
-    kill,
     terminate,
     waitForExit,
-    dispose,
   }
 }

packages/subprocess/subprocess-local/tests/spawn.spec.ts

@@ -164,26 +164,15 @@ describe('spawnSubprocess', () => {
     expect(result.signal).toBe('SIGKILL')
   })
 
-  it('kill() sends one signal Node-style, without escalation', async () => {
-    const running = spawnSubprocess(spec('trap \'\' TERM; echo armed; sleep 60', { graceMs: 100 }))
-    await waitForStdout(running, 'armed\n')
-    running.kill() // trapped SIGTERM, no SIGKILL follow-up
-    await new Promise(resolve => setTimeout(resolve, 400))
-    expect(running.collected.stdout).toBeDefined()
-    running.kill('SIGKILL') // explicit signal choice, still no timers
-    const result = await running.done
-    expect(result.signal).toBe('SIGKILL')
-  })
-
-  it('kills the whole process group (grandchildren die too)', async () => {
-    // The subshell writes the sleep's pid then waits on it; killing the
+  it('terminates the whole process group (grandchildren die too)', async () => {
+    // The subshell writes the sleep's pid then waits on it; terminating the
     // group must take the sleep down with bash.
     const pidFile = join(spillDir, `grandchild-${Date.now()}.pid`)
     const running = spawnSubprocess(spec(`sleep 60 & echo $! > ${pidFile}; wait`))
     const grandchild = await waitForPidFile(pidFile)
     expect(grandchild).toBeGreaterThan(0)
 
-    running.kill()
+    running.terminate()
     const result = await running.done
     expect(result.signal).toBe('SIGTERM')
     await waitGone(grandchild)
@@ -451,22 +440,6 @@ describe('killGroup', () => {
     expect(() => { killGroup(running.pid, 'SIGTERM') }).not.toThrow()
   })
 
-  it('handle.kill() after the tree died delivers no termination signal', async () => {
-    // Cleanup code commonly kills handles in a finally; once the tree is gone
-    // the pid may be reused, so a late kill must deliver nothing (the
-    // liveness PROBE — signal 0 — is the only process.kill allowed).
-    const running = spawnSubprocess(spec('true'))
-    await running.done
-    await running.waitForExit()
-    const spy = vi.spyOn(process, 'kill')
-    try {
-      running.kill()
-      const delivered = spy.mock.calls.filter(([, sig]) => sig !== 0)
-      expect(delivered).toEqual([])
-    } finally {
-      spy.mockRestore()
-    }
-  })
 })
 
 describe('stdio dispositions', () => {
@@ -505,42 +478,8 @@ describe('stdio dispositions', () => {
   })
 })
 
-describe('dispose ladder', () => {
-  it('tier 1: a cooperative child exits on stdin EOF without any signal', async () => {
-    const running = spawnSubprocess({
-      ...spec('read -r line; exit 0'),
-      stdio: { stdin: 'pipe', stdout: { maxBytes: 1000 }, stderr: { maxBytes: 1000 } },
-    })
-    await running.dispose({ eofGraceMs: 5_000, graceMs: 200 })
-    const outcome = await running.done
-    expect(outcome.exitCode).toBe(0)
-    expect(outcome.signal).toBeNull()
-  })
-
-  it('tier 2: an EOF-deaf child dies by SIGTERM', async () => {
-    const running = spawnSubprocess({
-      ...spec('sleep 60'),
-      stdio: { stdin: 'pipe', stdout: { maxBytes: 1000 }, stderr: { maxBytes: 1000 } },
-    })
-    await running.dispose({ eofGraceMs: 100, graceMs: 5_000 })
-    const outcome = await running.done
-    expect(outcome.signal).toBe('SIGTERM')
-  })
-
-  it('tier 3: a TERM-trapping child dies by SIGKILL, and dispose() is idempotent', async () => {
-    const running = spawnSubprocess(spec('trap \'\' TERM; echo armed; sleep 60'))
-    await waitForStdout(running, 'armed\n')
-    const first = running.dispose({ eofGraceMs: 50, graceMs: 200 })
-    const second = running.dispose({ eofGraceMs: 50, graceMs: 200 })
-    expect(second).toBe(first)
-    await first
-    const outcome = await running.done
-    expect(outcome.signal).toBe('SIGKILL')
-  })
-})
-
 describe('windows tree semantics (injected platform)', () => {
-  it('kill and terminate route through taskkill by root pid', async () => {
+  it('terminate routes through taskkill by root pid', async () => {
     const killed: number[] = []
     const running = spawnSubprocess(spec('sleep 60', { graceMs: 100 }), {
       spillDir,
@@ -589,7 +528,7 @@ describe('waitForExit', () => {
   })
 })
 
-describe('tree-survivor escalation (terminate/dispose reach helpers the leader left behind)', () => {
+describe('tree-survivor escalation (terminate and bounded waits reach helpers the leader left behind)', () => {
   it('terminate() SIGKILLs a TERM-trapping descendant after the direct child settles', async () => {
     // The leader spawns a TERM-trapping helper with all stdio detached from
     // the collected pipes, then exits: the helper holds the GROUP alive while
@@ -608,18 +547,21 @@ describe('tree-survivor escalation (terminate/dispose reach helpers the leader l
     await waitGone(helper)
   })
 
-  it('dispose() holds each tier on whole-tree exit, not direct-child settlement', async () => {
-    const pidFile = join(spillDir, `survivor-dispose-${Date.now()}.pid`)
+  it('a bounded waitForExit reports false while a survivor lives, true after escalation', async () => {
+    const pidFile = join(spillDir, `survivor-wait-${Date.now()}.pid`)
     const running = spawnSubprocess(spec(
       `bash -c 'trap "" TERM; echo $$ > ${pidFile}; sleep 60' >/dev/null 2>&1 & disown; exit 0`,
       { graceMs: 200 },
     ))
     const helper = await waitForPidFile(pidFile)
     await running.done
-    expect(() => process.kill(helper, 0)).not.toThrow()
-
-    await running.dispose({ eofGraceMs: 100, graceMs: 300 })
-    // The ladder only returns once the WHOLE tree is gone.
+    // A consumer-owned teardown tier bounds its wait and reads the verdict.
+    const bound = new AbortController()
+    const timer = setTimeout(() => { bound.abort() }, 100)
+    await expect(running.waitForExit(bound.signal)).resolves.toBe(false)
+    clearTimeout(timer)
+    running.terminate()
+    await expect(running.waitForExit()).resolves.toBe(true)
     expect(() => process.kill(helper, 0)).toThrow()
   })
 
@@ -652,11 +594,10 @@ describe('coverage seams', () => {
     expect(() => { taskkillProcessTree(2 ** 30) }).not.toThrow()
   })
 
-  it('dispose on a spawn-failed handle observes the rejection and returns', async () => {
+  it('a spawn-failed handle rejects done while waitForExit reports gone', async () => {
     const running = spawnSubprocess(spec('true', { cwd: '/nonexistent-dir-dsh-dispose-test' }))
-    const disposal = running.dispose({ eofGraceMs: 1_000, graceMs: 1_000 })
     await expect(running.done).rejects.toThrow()
-    await expect(disposal).resolves.toBeUndefined()
+    await expect(running.waitForExit()).resolves.toBe(true)
   })
 
   it("an 'inherit' stdout with collected stderr wires only the requested collector", async () => {
@@ -671,6 +612,18 @@ describe('coverage seams', () => {
     expect(running.collected.stderr!.readFrom(0).text).toBe('err\n')
   })
 
+  it("an 'inherit' stderr with collected stdout wires only the requested collector", async () => {
+    const running = spawnSubprocess({
+      ...spec('echo out; echo to-parent >&2'),
+      stdio: { stdin: 'ignore', stdout: { maxBytes: 1000 }, stderr: 'inherit' },
+    })
+    const outcome = await running.done
+    expect(outcome.exitCode).toBe(0)
+    expect(running.stderr).toBeUndefined()
+    expect(running.collected.stderr).toBeUndefined()
+    expect(running.collected.stdout!.readFrom(0).text).toBe('out\n')
+  })
+
   it('terminate() after the tree died delivers no termination signal', async () => {
     const running = spawnSubprocess(spec('true'))
     await running.done
@@ -691,25 +644,10 @@ describe('coverage seams', () => {
     await expect(running.waitForExit()).resolves.toBe(true)
   })
 
-  it('dispose() on an already-exited tree returns without delivering a signal', async () => {
-    const running = spawnSubprocess(spec('true'))
-    await running.done
-    await running.waitForExit()
-    const spy = vi.spyOn(process, 'kill')
-    try {
-      await running.dispose({ eofGraceMs: 50, graceMs: 50 })
-      const delivered = spy.mock.calls.filter(([, sig]) => sig !== 0)
-      expect(delivered).toEqual([])
-    } finally {
-      spy.mockRestore()
-    }
-  })
-
-  it('a batch-stdin handle exposes no stdin and dispose skips the EOF tier', async () => {
+  it('a batch-stdin handle exposes no stdin surface', async () => {
     const running = spawnSubprocess(spec('cat', { stdin: 'batch\n' }))
     expect(running.stdin).toBeUndefined()
     await running.done
-    await running.dispose({ eofGraceMs: 50, graceMs: 50 })
     expect(running.collected.stdout!.readFrom(0).text).toBe('batch\n')
   })
 })
@@ -738,33 +676,15 @@ describe('coverage seams 2', () => {
     await expect(running.waitForExit()).resolves.toBe(true)
   })
 
-  it('the win32 dispose ladder skips the POSIX SIGTERM tier and force-terminates', async () => {
-    const kills: number[] = []
-    const running = spawnSubprocess({
-      ...spec('sleep 60'),
-      stdio: { stdin: 'pipe', stdout: { maxBytes: 1000 }, stderr: { maxBytes: 1000 } },
-    }, {
-      spillDir,
-      platform: 'win32',
-      taskkill: (pid) => {
-        kills.push(pid)
-        try {
-          process.kill(pid, 'SIGKILL')
-        } catch {
-          // Already gone.
-        }
-      },
-    })
-    await running.dispose({ eofGraceMs: 50, graceMs: 5_000 })
-    // Exactly one forced tree termination: no POSIX SIGTERM tier ran.
-    expect(kills).toEqual([running.pid])
-  })
-
-  it('dispose throws when even SIGKILL produces no exit within the grace', async () => {
-    // An inert taskkill simulates a tree that never reports exit.
+  it('an inert win32 taskkill leaves the tree alive for a bounded wait to report', async () => {
+    // An inert taskkill simulates a tree that never reports exit: terminate()
+    // delivers nothing, so a bounded consumer wait must come back false.
     const running = spawnSubprocess(spec('sleep 60'), { spillDir, platform: 'win32', taskkill: () => {} })
-    await expect(running.dispose({ eofGraceMs: 20, graceMs: 40 }))
-      .rejects.toThrow(/did not exit within 40ms after forced termination/)
+    running.terminate()
+    const bound = new AbortController()
+    const timer = setTimeout(() => { bound.abort() }, 60)
+    await expect(running.waitForExit(bound.signal)).resolves.toBe(false)
+    clearTimeout(timer)
     // Real cleanup: the injected platform spawned without detachment, so the
     // child is a plain (group-less) POSIX process — kill it directly.
     process.kill(running.pid, 'SIGKILL')

packages/subprocess/subprocess-local/tsconfig.json

@@ -17,9 +17,6 @@
     {
       "path": "../subprocess"
     },
-    {
-      "path": "../../util/timeout"
-    },
     {
       "path": "../../support/invariants"
     }

packages/subprocess/subprocess/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
-README.md: 65c2be2b77fbd7105208b86fa1b98a3c44013f94
-README.zh.md: 98a0315914746a94350ceec53e4daff886054e64
+README.md: c360437bf2b2b95734f55f6aec46b0cecffb9260
+README.zh.md: 888b8863cc1dfb0828a6d0c8c59a48790cb1522e

packages/subprocess/subprocess/README.md

@@ -9,7 +9,7 @@ The subprocess seam (`ctx.subprocess`). The abstract `SubprocessService` exposes
 - `spawn(spec)` returns immediately with a live handle; `done` resolves at process close with exit facts (`SubprocessOutcome` carries no output and no cause classification) and rejects only for spawn-level failures.
 - The spec is fully explicit — argv, cwd, per-stream stdio dispositions, grace — because deployment-varying defaults belong to the calling seam's config, not to a hidden subprocess-service default (the `dsh-bash` request/spec split is the owning template). `argv` is never shell-interpreted; a consumer that wants a shell passes `['bash', '-c', command]` itself.
 - Stdio is Node-shaped per stream: `'pipe'` hands the caller the raw stream for its own protocol framing (LSP JSON-RPC, ACP ndjson), `'inherit'` passes the parent descriptor through for diagnostics, and collect mode (`{ maxBytes, spill? }`) buffers a bounded tail with an optional full-stream spill file. Collect readers take whole-stream byte offsets and never consume, so independent readers cannot steal one another's deltas; a read whose offset slid out of the in-memory tail is `lossy` and points at the spill file when one exists. Collected output stays readable after settlement.
-- Termination is tree-scoped on every platform (POSIX detached groups with direct-child fallback; Windows `taskkill /T`): `kill(signal)` sends one signal Node-style and is a no-op after settlement, `terminate()` (and the spec's abort signal) escalates SIGTERM→grace→SIGKILL, `waitForExit()` observes the whole tree, and `dispose(graces)` runs the cooperative stdin-EOF→SIGTERM→SIGKILL ladder out-of-process children need — the manager reacts but never classifies why (callers own deadlines and cause classification).
+- Termination is tree-scoped on every platform (POSIX detached groups with direct-child fallback; Windows `taskkill /T`): `terminate()` — the only termination verb — escalates SIGTERM→grace→SIGKILL (idempotent, driven by the spec's abort signal too, a no-op once the tree is gone), and `waitForExit(signal?)` observes whole-tree liveness so a consumer-owned teardown ladder holds each tier on real quiescence — the manager reacts but never classifies why (callers own deadlines, teardown ladders, and cause classification).
 - `scrubbedParentEnv()` / `SENSITIVE_ENV_PATTERN` are the one shared scrub definition: ambient credential-shaped and `DSH_*` names are dropped, and the spec's explicit `env` merges after the scrub with no namespace validation — a deliberately forwarded credential or a current `DSH_*` fact survives precisely because it is an explicit caller opt-in, while the stale ambient namesake never reaches the child. Spawners that cannot route through the service (node-pty backends, SDK-managed transports) import the scrub.
 - Disposal of the service terminates all still-running managed processes and awaits their exit.
 
@@ -26,4 +26,4 @@ No direct invalidation; the named consumers own any request-prefix changes.
 ## Known Limitations and Deferred Work
 
 - **node-pty and SDK-managed spawns share only the scrub** — the PTY backend's terminal fork and the MCP SDK's own stdio transport cannot route their spawns through this seam (the library owns the fork/spawn call); they import `scrubbedParentEnv` so the environment policy stays single-sourced.
-- **The dispose ladder assumes stdin-EOF cooperation** — a child that quiesces on a different signal (SIGHUP conventions, control sockets) needs its own tier-1 before the generic ladder fits.
+- **Teardown ladders are consumer-owned** — the seam ships signalling verbs and the tree-liveness wait, not a canned quiesce sequence; each out-of-process consumer encodes its child's cooperation shape itself (the ACP backend's stdin-EOF-first ladder is the in-repo template).

packages/subprocess/subprocess/README.zh.md

@@ -9,7 +9,7 @@
 - `spawn(spec)` 立即返回一个实时句柄；`done` 在进程关闭时以退出事实 resolve（`SubprocessOutcome` 不携带输出，也不携带原因分类），仅在 spawn 层面失败时 reject。
 - spec 完全显式（argv、cwd、按流划分的 stdio 处置方式（disposition）、宽限期），因为随部署变化的默认值属于调用方 seam 的配置，而不属于某个隐藏的进程管理器默认值（`dsh-bash` 的 request/spec 拆分是这条规则的所属模板）。`argv` 绝不经过 shell 解释；需要 shell 的消费方自行传入 `['bash', '-c', command]`。
 - stdio 按流采用 Node 形状：`'pipe'` 把原始流交给调用方做自己的协议分帧（LSP 的 JSON-RPC、ACP（Agent Client Protocol）的 ndjson），`'inherit'` 直通父进程描述符以承载诊断输出，收集模式（collect）`{ maxBytes, spill? }` 则缓冲一段有界尾部，外加可选的完整流 spill 文件。收集模式的读取器接受全流字节偏移量且从不消费，因此独立的读取器不会抢走彼此的增量；偏移量滑出内存尾部窗口的读取标记为 `lossy`，并在 spill 文件存在时指向它。收集到的输出在结算后仍可读取。
-- 终止在每个平台上都以进程树为范围（POSIX 用 detached 进程组并以直接子进程回退；Windows 用 `taskkill /T`）：`kill(signal)` 以 Node 风格只发送一个信号，结算后为空操作；`terminate()`（以及 spec 的 abort 信号）执行 SIGTERM→宽限期→SIGKILL 升级；`waitForExit()` 观察整棵进程树；`dispose(graces)` 运行进程外子进程所需的协作式 stdin EOF→SIGTERM→SIGKILL 阶梯。管理器只响应中止，但绝不判定原因（deadline 与原因分类归调用方所有）。
+- 终止在每个平台上都以进程树为范围（POSIX 用 detached 进程组并以直接子进程回退；Windows 用 `taskkill /T`）：`terminate()`（唯一的终止动词）执行 SIGTERM→宽限期→SIGKILL 升级（幂等，也由 spec 的 abort 信号驱动，进程树消亡后为空操作）；`waitForExit(signal?)` 观察整棵进程树的存活状态，使消费方自有的拆卸阶梯能在真正完全停稳后才进入下一层。管理器只响应中止，但绝不判定原因（deadline、拆卸阶梯与原因分类归调用方所有）。
 - `scrubbedParentEnv()` / `SENSITIVE_ENV_PATTERN` 是唯一一份共享的凭据清除定义：环境中形似凭据的名称与 `DSH_*` 名称都会被丢弃，spec 的显式 `env` 在清除之后合并且不做命名空间校验——有意转发的凭据或当前 `DSH_*` 事实之所以能保留下来，正因为它是调用方的显式选择，而陈旧的同名环境值永远到不了子进程。无法把 spawn 路由到该服务的调用点（node-pty 后端、由 SDK 管理的传输层）改为导入凭据清除函数。
 - 服务自身的 dispose（资源释放）会终止所有仍在运行的受管进程并等待其退出。
 
@@ -26,4 +26,4 @@
 ## 已知限制与暂缓事项
 
 - **node-pty 与由 SDK 管理的 spawn 只共享凭据清除**：PTY 后端的终端 fork 与 MCP SDK 自己的 stdio 传输层无法把 spawn 路由到这道 seam（fork/spawn 调用归库所有）；它们改为导入 `scrubbedParentEnv`，使环境策略保持单一来源。
-- **dispose 阶梯假定子进程配合 stdin EOF**：依赖其他信号（SIGHUP 惯例、控制 socket）才能完全停稳的子进程，需要自己的第一阶，通用阶梯才适用。
+- **拆卸阶梯归消费方所有**：该 seam 只提供信号动词与进程树存活等待，不提供现成的停稳序列；每个进程外消费方自行编码其子进程的配合形状（ACP 后端以 stdin EOF 打头的阶梯是仓库内模板）。

packages/subprocess/subprocess/src/index.ts

@@ -2,10 +2,9 @@
  * The subprocess seam (`ctx.subprocess`): spawn fully-specified commands into
  * managed process trees with Node-shaped stdio dispositions — raw pipes for
  * protocol streams, inherit for diagnostics, bounded spill-backed collection
- * for batch output — plus tree-scoped signalling and a cooperative dispose
- * ladder. Command defaulting, shell semantics, deadlines, framing, and
- * presentation belong to consumers; the bash executor seam is the owning
- * template. The local implementation lives in
+ * for batch output — plus tree-scoped signalling. Command defaulting, shell
+ * semantics, deadlines, teardown ladders, framing, and presentation belong to
+ * consumers; the bash executor seam is the owning template. The local implementation lives in
  * `@deepseek-ai/dsh-subprocess-local`.
  * @module @deepseek-ai/dsh-subprocess
  */
@@ -21,7 +20,6 @@ export type {
   DshEnvironmentKey,
   SubprocessCollect,
   SubprocessCollectedOutputs,
-  SubprocessDisposeGraces,
   SubprocessHandle,
   SubprocessOutcome,
   SubprocessOutputMode,
@@ -79,10 +77,11 @@ declare module 'cordis' {
  *   readers never consume one another's output; lossy reads report truncation
  *   and the spill file holding the complete stream when one exists. Piped
  *   streams are handed to the caller raw and never buffered here.
- * - {@link SubprocessHandle.kill} signals without escalation,
- *   {@link SubprocessHandle.terminate} (and the spec's abort signal) escalates
- *   SIGTERM→grace→SIGKILL, and {@link SubprocessHandle.dispose} runs the
- *   cooperative EOF-first ladder — all tree-scoped on every platform.
+ * - {@link SubprocessHandle.terminate} (and the spec's abort signal) escalates
+ *   SIGTERM→grace→SIGKILL — the only termination verb — tree-scoped on every
+ *   platform. {@link SubprocessHandle.waitForExit} observes whole-tree
+ *   liveness, so a consumer-owned teardown ladder can hold each tier on real
+ *   quiescence.
  * - Disposal of the service terminates all still-running managed processes
  *   and awaits their exit.
  */

packages/subprocess/subprocess/src/types.ts

@@ -155,30 +155,6 @@ export interface SubprocessCollectedOutputs {
   readonly stderr?: SubprocessOutputReader
 }
 
-/**
- * The two grace periods of the cooperative dispose ladder
- * ({@link SubprocessHandle.dispose}). Consumers carry them as defaulted,
- * validated Config fields, so teardown timing is deployment-tunable and this
- * seam hardcodes nothing.
- */
-export interface SubprocessDisposeGraces {
-  /**
-   * Tier-1 window (ms): after stdin EOF, how long the child gets to quiesce
-   * ON ITS OWN — flush durable state, tear down its own descendants — before
-   * escalation to platform termination. Usually WIDER than
-   * {@link SubprocessDisposeGraces.graceMs}: a cooperative child's EOF-driven
-   * teardown may itself wait on a signal-trapping grandchild plus a final
-   * flush.
-   */
-  eofGraceMs: number
-  /**
-   * Termination confirmation window (ms): POSIX applies it after `SIGTERM`
-   * and again after `SIGKILL`; Windows applies it after the forced tree
-   * termination.
-   */
-  graceMs: number
-}
-
 /**
  * A live child process rooted in its own process tree. Collected output
  * remains readable after exit; piped streams belong to the caller.
@@ -201,17 +177,11 @@ export interface SubprocessHandle {
   readonly collected: SubprocessCollectedOutputs
   /** Resolves at process close with exit facts; rejects only for spawn-level failures. */
   readonly done: Promise<SubprocessOutcome>
-  /**
-   * Send one signal to the process tree, Node-style — no escalation, no
-   * timers. A no-op after the outcome has settled (the pid may be reused).
-   * @param signal - the signal to deliver (default `SIGTERM`; Windows
-   *   force-terminates the tree for any value).
-   */
-  kill(signal?: NodeJS.Signals): void
   /**
    * Begin the SIGTERM → `graceMs` → SIGKILL escalation on the process tree
-   * (Windows force-terminates immediately). Idempotent; also triggered by the
-   * spec's abort signal.
+   * (Windows force-terminates immediately) — the seam's only termination
+   * verb. Idempotent, a no-op once the tree is gone (the pid may be reused),
+   * and also triggered by the spec's abort signal.
    */
   terminate(): void
   /**
@@ -221,13 +191,4 @@ export interface SubprocessHandle {
    * @returns `true` when the tree exited, `false` when the signal aborted first.
    */
   waitForExit(signal?: AbortSignal): Promise<boolean>
-  /**
-   * Tear the child down to quiescence, resolving only after exit: close stdin
-   * (when this handle owns a piped one) and allow cooperative flush for
-   * `eofGraceMs`, then SIGTERM with a `graceMs` window (POSIX), then forced
-   * tree termination with a final bounded `graceMs` wait.
-   * @param graces - the ladder's two windows, from the consumer's Config.
-   * @throws when the child still has not exited `graceMs` after the forced tier.
-   */
-  dispose(graces: SubprocessDisposeGraces): Promise<void>
 }

packages/subprocess/subprocess/tests/service.spec.ts

@@ -1,7 +1,7 @@
 import { describe, expect, it } from 'vitest'
 import { Context } from 'cordis'
 import { scrubbedParentEnv, SubprocessService } from '@deepseek-ai/dsh-subprocess'
-import type { SubprocessDisposeGraces, SubprocessHandle, SubprocessOutputRead, SubprocessSpawnSpec } from '@deepseek-ai/dsh-subprocess'
+import type { SubprocessHandle, SubprocessOutputRead, SubprocessSpawnSpec } from '@deepseek-ai/dsh-subprocess'
 
 /**
  * Minimal concrete service: a hand-built handle. The seam is spawn-only —
@@ -21,10 +21,8 @@ class StubSubprocessService extends SubprocessService {
       stderr: undefined,
       collected,
       done: Promise.resolve({ exitCode: 0, signal: null }),
-      kill: () => {},
       terminate: () => {},
       waitForExit: () => Promise.resolve(true),
-      dispose: (_graces: SubprocessDisposeGraces) => Promise.resolve(),
     }
   }
 }
@@ -41,10 +39,8 @@ describe('SubprocessService seam', () => {
     })
     expect(handle.pid).toBe(1)
     expect(handle.collected.stdout!.readFrom(0)).toEqual({ text: '', nextOffset: 0, lossy: false })
-    handle.kill()
     handle.terminate()
     await expect(handle.waitForExit()).resolves.toBe(true)
-    await expect(handle.dispose({ eofGraceMs: 1, graceMs: 1 })).resolves.toBeUndefined()
     const outcome = await handle.done
     expect(outcome.exitCode).toBe(0)
   })

pnpm-lock.yaml

@@ -3851,9 +3851,6 @@ importers:
       '@deepseek-ai/dsh-subprocess':
         specifier: workspace:^
         version: link:../subprocess
-      '@deepseek-ai/dsh-timeout':
-        specifier: workspace:^
-        version: link:../../util/timeout
       cordis:
         specifier: ^4.0.0-rc.7
         version: 4.0.0-rc.7(@cordisjs/plugin-include@1.0.4)(@cordisjs/plugin-loader@1.0.0-rc.5)

scripts/type-equiv.manifest.json

@@ -1303,11 +1303,6 @@
       "doc": "docs/core-data-structures/subprocess.md",
       "symbol": "SubprocessCollectedOutputs",
       "source": "packages/subprocess/subprocess/src/types.ts"
-    },
-    {
-      "doc": "docs/core-data-structures/subprocess.md",
-      "symbol": "SubprocessDisposeGraces",
-      "source": "packages/subprocess/subprocess/src/types.ts"
     }
   ]
 }