refactor(code-runtime): remove subprocess backend

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 packages/subprocess/subprocess-local/README.md
-README.md: 4892ad49e571662b833b1dd6d64dc966f343ae3c
-README.zh.md: ca0df5ff18e9feb992cc3f6d0db90dc06cb275d8
+README.md: 85103c2634bd35b188acd71c7f037e3678a2542e
+README.zh.md: 505eac4f2650e6723e042cdb1122f9ef504ad7df

packages/subprocess/subprocess-local/README.md

@@ -2,7 +2,7 @@
 
 English | [中文](README.zh.md)
 
-Local implementation of the [`@deepseek-ai/dsh-subprocess`](../subprocess/README.md) seam. `LocalSubprocessService` resolves local executables, spawns ordinary detached process trees with explicit stdio, and implements terminal processes through `node-pty` plus platform process inspection. It has no config: every disposition, limit, terminal dimension, grace, and directory arrives from the calling seams ([`dsh-bash-local`](../../bash/bash-local/README.md), [`dsh-lsp-local`](../../lsp/lsp-local/README.md), [`dsh-pty-local`](../../pty/pty-local/README.md), and [`dsh-code-runtime-subprocess`](../../code-runtime/code-runtime-subprocess/README.md)).
+Local implementation of the [`@deepseek-ai/dsh-subprocess`](../subprocess/README.md) seam. `LocalSubprocessService` resolves local executables, spawns ordinary detached process trees with explicit stdio, and implements terminal processes through `node-pty` plus platform process inspection. It has no config: every disposition, limit, terminal dimension, grace, and directory arrives from the calling seams ([`dsh-bash-local`](../../bash/bash-local/README.md), [`dsh-lsp-local`](../../lsp/lsp-local/README.md), and [`dsh-pty-local`](../../pty/pty-local/README.md)).
 
 ## Behavior (and where it came from)
 
@@ -10,7 +10,7 @@ Local implementation of the [`@deepseek-ai/dsh-subprocess`](../subprocess/README
 - **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.
-- **Execution-world coordinates** — `cwd` is the host process cwd, and `resolveExecutable` checks absolute files or searches the scrubbed effective PATH with platform-aware executable extensions.
+- **Executable lookup** — `resolveExecutable` checks absolute files or searches the scrubbed effective PATH with platform-aware executable extensions; relative PATH entries resolve from the host process cwd.
 - **Terminal-process ownership** — `spawnTerminal` allocates `node-pty`, bridges UTF-8 terminal text, inspects and signals the current foreground process group, and exposes one awaited termination operation that sweeps descendants before and after terminating the top-level shell. Each foreground inspection retains exact identities from the rooted tree; Linux also enumerates the POSIX session after its leader exits. A previously observed macOS descendant and any same-session Linux member therefore remain fenced after reparenting, while pid/start identity prevents cleanup from following PID reuse. The higher PTY backend owns prompt readiness, buffers, and model-facing operations.
 - **Terminate-and-join disposal** — the service retains live handles only so its own disposal can escalate every running tree and await its exit; settled and spawn-failed handles leave the live set on settlement.
 

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

@@ -2,7 +2,7 @@
 
 [English](README.md) | 中文
 
-[`@deepseek-ai/dsh-subprocess`](../subprocess/README.md) seam 的本地实现。`LocalSubprocessService` 解析本地可执行文件，以显式 stdio spawn 普通 detached 进程树，并通过 `node-pty` 加平台进程检查实现终端进程。该实现没有任何配置：每项处置方式、限制、终端尺寸、宽限期与目录都来自调用方 seam（[`dsh-bash-local`](../../bash/bash-local/README.md)、[`dsh-lsp-local`](../../lsp/lsp-local/README.md)、[`dsh-pty-local`](../../pty/pty-local/README.md) 和 [`dsh-code-runtime-subprocess`](../../code-runtime/code-runtime-subprocess/README.md)）。
+[`@deepseek-ai/dsh-subprocess`](../subprocess/README.md) seam 的本地实现。`LocalSubprocessService` 解析本地可执行文件，以显式 stdio spawn 普通 detached 进程树，并通过 `node-pty` 加平台进程检查实现终端进程。该实现没有任何配置：每项处置方式、限制、终端尺寸、宽限期与目录都来自调用方 seam（[`dsh-bash-local`](../../bash/bash-local/README.md)、[`dsh-lsp-local`](../../lsp/lsp-local/README.md) 和 [`dsh-pty-local`](../../pty/pty-local/README.md)）。
 
 ## 行为（以及设计来源）
 
@@ -10,7 +10,7 @@
 - **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` 则只保留用于诊断的尾部。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，位于按需创建、权限为 `0700` 的每进程目录之下。
 - **凭据清除 + 显式合并**：以 `process.env` 为基础，移除形似凭据的变量（`*KEY*`／`*PASSWORD*`／`*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**：收集模式的读取器按完整流的字节坐标返回增量；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。
-- **执行世界坐标**：`cwd` 是宿主进程 cwd，`resolveExecutable` 检查绝对文件，或根据平台可执行文件扩展名在清理后的有效 PATH 中搜索。
+- **可执行文件查找**：`resolveExecutable` 检查绝对文件，或根据平台可执行文件扩展名在清理后的有效 PATH 中搜索；相对 PATH 条目从宿主进程 cwd 解析。
 - **终端进程所有权**：`spawnTerminal` 分配 `node-pty`，桥接 UTF-8 终端文本，检查当前前台进程组并向其发送信号，还会公开一项须等待的终止操作，在终止顶层 shell 前后清理后代进程。每次前台检查都会保留根进程树中的精确身份；Linux 还会在 POSIX 会话 leader 退出后枚举该会话。因此，之前观察到的 macOS 后代以及同会话 Linux 成员在重新设定父进程后仍受围栏保护，pid/start 身份则防止清理跟随 PID 复用。上层 PTY 后端负责提示符就绪、缓冲区与面向模型的操作。
 - **先终止再等待退出的 dispose（资源释放）**：服务保留存活句柄，只为让自身的 dispose 能对每个仍在运行的进程树执行升级并等待其退出；已结算与 spawn 失败的句柄在结算时即离开存活集合。
 

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

@@ -33,7 +33,6 @@ import { LocalTerminalHandle } from './terminal.ts'
  * SIGTERM→grace→SIGKILL escalation.
  */
 export class LocalSubprocessService extends SubprocessService {
-  readonly cwd = process.cwd()
   /** Live handles retained only so disposal can terminate and join them. */
   private live = new Set<SubprocessHandle>()
   /** Live terminal sessions retained through whole-session quiescence. */
@@ -103,7 +102,7 @@ export class LocalSubprocessService extends SubprocessService {
       ? (environmentValue(env, 'PATHEXT') ?? '.COM;.EXE;.BAT;.CMD').split(';')
       : ['']
     return path.split(delimiter).flatMap(directory =>
-      extensions.map(extension => resolve(this.cwd, directory, command + extension)))
+      extensions.map(extension => resolve(process.cwd(), directory, command + extension)))
   }
 
   spawn(spec: SubprocessSpawnSpec): SubprocessHandle {

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

@@ -31,9 +31,6 @@ describe('LocalSubprocessService', () => {
     expect(await ctx.subprocess.resolveExecutable(basename(process.execPath), {
       PATH: relative(process.cwd(), dirname(process.execPath)) || '.',
     })).toBe(process.execPath)
-    Reflect.set(ctx.subprocess, 'cwd', dirname(process.execPath))
-    expect(await ctx.subprocess.resolveExecutable(basename(process.execPath), { PATH: '' }))
-      .toBe(process.execPath)
     await expect(ctx.subprocess.resolveExecutable('')).rejects.toThrow('must be non-empty')
     await expect(ctx.subprocess.resolveExecutable('dsh-command-that-does-not-exist', { PATH: '' }))
       .rejects.toThrow('was not found on PATH')