revert(bash): drop the executor dialect guard

The ShellDialect marker on BashExecutor and the load-time rejection in
tool-bash/tool-pwsh force every test and example fake executor to declare
a dialect for a guard with no in-repo or plausible deployment to catch
(shipped compositions always pair the tool with its matching executor),
and they break the example composition suites that stub ctx.bash without
a dialect (agent-spine-demo/cli-demo/acp-demo lost the bash tool).

Keep the non-dialect doc fixes that landed with the attempt: the tool-bash
README bashEnv contract trim with the stale example import removed, the
acp-snapshot suite.ts 'usable pwsh' JSDoc, and the pwsh.cordis.yml comment
indent. The parity note records the attempt and revert under Alternatives.

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

@@ -80,8 +80,6 @@ function assertPositiveFinite(name: string, value: number): void {
 export class LocalBashExecutor extends BashExecutor {
   static inject = ['subprocess']
 
-  readonly dialect = 'bash' as const
-
   static Config: z<Config> = z.object({
     cwd: z.string(),
     timeoutMs: z.number().default(120_000),

packages/bash/bash/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/bash/bash/README.md
-README.md: b4dbfb6cd9af92d65e30be8d0237b17611b6cbe8
-README.zh.md: 8cf73948970bf0ba465d04b5bedc7e4146fdd217
+README.md: d7bf746969f52000fe298b65b995b7c631d8001c
+README.zh.md: a7c0cac0bce2154362c822c213a44f3c507d541c

packages/bash/bash/README.md

@@ -2,7 +2,7 @@
 
 English | [中文](README.zh.md)
 
-The **bash executor seam**: an abstract `BashExecutor` service (`ctx.bash`) defining WHAT a bash backend does — run foreground commands and start background processes — without saying HOW. Every implementation declares its `dialect` (`ShellDialect`: the concrete shell that parses the command string, `bash` or `powershell`), and the model-facing shell tools reject a mismatched executor at load. Task ids, ownership, collection, cancellation, and notices belong to the generic `ctx.tasks` runtime.
+The **bash executor seam**: an abstract `BashExecutor` service (`ctx.bash`) defining WHAT a bash backend does — run foreground commands and start background processes — without saying HOW. Task ids, ownership, collection, cancellation, and notices belong to the generic `ctx.tasks` runtime.
 
 This package is the interface quarter of the bash capability, split so each concern can evolve (and be swapped) independently:
 

packages/bash/bash/README.zh.md

@@ -2,7 +2,7 @@
 
 [English](README.md) | 中文
 
-**bash 执行器 seam**：抽象 `BashExecutor` 服务（`ctx.bash`）定义 bash 后端做什么，即运行前台命令与启动后台进程，但不规定如何实现。每个实现声明自己的 `dialect`（`ShellDialect`：解析命令字符串的具体 shell，`bash` 或 `powershell`），模型侧 shell 工具在加载时拒绝不匹配的执行器。task id、所有权、收集、取消与通知属于通用 `ctx.tasks` 运行时。
+**bash 执行器 seam**：抽象 `BashExecutor` 服务（`ctx.bash`）定义 bash 后端做什么，即运行前台命令与启动后台进程，但不规定如何实现。task id、所有权、收集、取消与通知属于通用 `ctx.tasks` 运行时。
 
 本包（package）是 bash 能力中负责接口的四分之一，各项职责因此可以独立演进（和替换）：
 

packages/bash/bash/src/index.ts

@@ -29,14 +29,6 @@ declare module 'cordis' {
   }
 }
 
-/**
- * The shell language a command string is written in. Values name concrete
- * shells, not families — the executor hands the string verbatim to that
- * shell's parser (`bash -c`, `pwsh -Command`), so a POSIX-ish sibling such
- * as zsh or fish would be its own dialect, never `bash`.
- */
-export type ShellDialect = 'bash' | 'powershell'
-
 /**
  * Abstract bash execution service. Subclass, implement the abstract methods,
  * and load the subclass as a plugin — it registers as `ctx.bash` (one
@@ -61,14 +53,6 @@ export abstract class BashExecutor extends Service {
     super(ctx, 'bash')
   }
 
-  /**
-   * The shell dialect this executor's `run`/`start` parse commands with.
-   * Model-facing shell tools reject a mismatched executor at load
-   * (misconfiguration fails loud): a PowerShell command handed to `bash -c`
-   * would otherwise surface as an ordinary nonzero exit.
-   */
-  abstract readonly dialect: ShellDialect
-
   /**
    * The sandbox mode this executor applies by default, or `undefined` when it
    * does not sandbox commands.

packages/bash/bash/tests/service.spec.ts

@@ -10,8 +10,6 @@ import type { BashExecRequest, BashExecSpec, BashProcess, BashProcessRead, BashR
  * owes the abstract class.
  */
 class StubExecutor extends BashExecutor {
-  readonly dialect = 'bash' as const
-
   resolve(request: BashExecRequest): BashExecSpec {
     return {
       command: request.command,

packages/bash/pwsh-local/src/index.ts

@@ -104,8 +104,6 @@ function assertPositiveFinite(name: string, value: number): void {
 export class PwshLocalExecutor extends BashExecutor {
   static inject = ['subprocess']
 
-  readonly dialect = 'powershell' as const
-
   static Config: z<Config> = z.object({
     cwd: z.string(),
     timeoutMs: z.number().default(120_000),

packages/bash/tool-bash/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/bash/tool-bash/README.md
-README.md: be89acf06dbc6b4c420dd7fd34eb6ccb842c1fbd
-README.zh.md: 7886addd4c941d81a90546518a5967f64edcdf61
+README.md: f21b6b4344fcfb94d88f1f7e1c4444ee89e0ead8
+README.zh.md: c9dd3f2250631f3300edaf2c246e6925f3e12005

packages/bash/tool-bash/README.md

@@ -4,7 +4,7 @@ English | [中文](README.zh.md)
 
 The model-facing `bash` tool registered over the `ctx.bash` executor seam. Foreground execution stays behind that seam; a background process handle is registered with the generic `ctx.tasks` runtime and controlled through `task_output`, `task_list`, and `task_kill` from `@deepseek-ai/dsh-tool-tasks`.
 
-Requires a loaded executor implementation (e.g. `@deepseek-ai/dsh-bash-local`) and the [`@deepseek-ai/dsh-bash-env`](../bash-env/README.md) registry; the plugin stays pending until every injected service exists (`inject: ['tools', 'bash', 'systemPrompt', 'bashEnv']`), and rejects an executor whose `dialect` is not `bash` at load — a bash command handed to another shell's parser would surface as an ordinary nonzero exit.
+Requires a loaded executor implementation (e.g. `@deepseek-ai/dsh-bash-local`) and the [`@deepseek-ai/dsh-bash-env`](../bash-env/README.md) registry; the plugin stays pending until every injected service exists (`inject: ['tools', 'bash', 'systemPrompt', 'bashEnv']`).
 
 The package root exposes only the Cordis plugin contract (`name`, `inject`, `Config`, `apply`); result rendering and background-process adaptation remain implementation details covered by same-package tests.
 

packages/bash/tool-bash/README.zh.md

@@ -4,7 +4,7 @@
 
 模型侧 `bash` 工具，注册在 `ctx.bash` 执行器 seam 上。前台执行始终位于该 seam 之后；后台进程句柄会注册到通用 `ctx.tasks` 运行时，并通过 `task_output`、`task_list` 和 `task_kill` 控制；这些工具由 `@deepseek-ai/dsh-tool-tasks` 提供。
 
-需要加载执行器实现（例如 `@deepseek-ai/dsh-bash-local`）与 [`@deepseek-ai/dsh-bash-env`](../bash-env/README.md) 注册表；在每个注入服务就绪之前，插件会保持等待状态（`inject: ['tools', 'bash', 'systemPrompt', 'bashEnv']`），并在加载时拒绝 `dialect` 不为 `bash` 的执行器——bash 命令被交给其他 shell 解析只会表现为普通的非零退出。
+需要加载执行器实现（例如 `@deepseek-ai/dsh-bash-local`）与 [`@deepseek-ai/dsh-bash-env`](../bash-env/README.md) 注册表；在每个注入服务就绪之前，插件会保持等待状态（`inject: ['tools', 'bash', 'systemPrompt', 'bashEnv']`）。
 
 包（package）根只公开 Cordis 插件契约（`name`、`inject`、`Config`、`apply`）；结果渲染和后台进程适配仍是实现细节，由同包测试覆盖。
 

packages/bash/tool-bash/src/index.ts

@@ -188,11 +188,6 @@ const BACKGROUND_OUTPUT_PROPERTIES = {
 } as const
 
 export function apply(ctx: Context, config: Config = {}): void {
-  // Model commands are written in bash; a mismatched executor would hand
-  // them to another shell's parser and surface as ordinary nonzero exits.
-  if (ctx.bash.dialect !== 'bash') {
-    throw new Error(`tool-bash: the mounted executor speaks '${ctx.bash.dialect}', not bash — mount a bash executor (e.g. dsh-bash-local) or the matching shell tool`)
-  }
   const backgroundEnabled = config.enableRunInBackground ?? true
   const defaultMode = ctx.bash.sandboxMode
   const escalationModes: readonly SandboxMode[] = defaultMode === undefined ? [] : ESCALATION_TARGETS

packages/bash/tool-bash/tests/tools.spec.ts

@@ -5,7 +5,7 @@ import { describe, expect, it, vi } from 'vitest'
 import { Context } from 'cordis'
 import { CallId } from '@deepseek-ai/dsh-llm'
 import { BashExecutor } from '@deepseek-ai/dsh-bash'
-import type { BashExecRequest, BashExecSpec, BashProcess, BashProcessRead, BashRunResult, ShellDialect } from '@deepseek-ai/dsh-bash'
+import type { BashExecRequest, BashExecSpec, BashProcess, BashProcessRead, BashRunResult } from '@deepseek-ai/dsh-bash'
 import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
 import ToolRegistry, { TOOL_ABORTED, TOOL_ABORTED_BEFORE_DISPATCH } from '@deepseek-ai/dsh-tools'
 import AgentRegistry from '@deepseek-ai/dsh-agent'
@@ -101,8 +101,6 @@ async function callUntilText(
 }
 
 class RecordingSandboxExecutor extends BashExecutor {
-  readonly dialect = 'bash' as const
-
   readonly modes: Array<string | undefined> = []
 
   override get sandboxMode() {
@@ -156,8 +154,6 @@ class RecordingSandboxExecutor extends BashExecutor {
 
 /** Test executor that records whether the background start boundary was crossed. */
 class CountingStartExecutor extends BashExecutor {
-  readonly dialect: ShellDialect = 'bash'
-
   starts = 0
 
   resolve(request: BashExecRequest): BashExecSpec {
@@ -365,19 +361,6 @@ describe('bash tool', () => {
     expect(text(result)).toContain('tool execution arguments must be losslessly JSON-serializable')
   })
 
-  it('rejects an executor speaking another shell dialect at load', async () => {
-    class PowershellDialectExecutor extends CountingStartExecutor {
-      override readonly dialect: ShellDialect = 'powershell'
-    }
-    const ctx = new Context()
-    await ctx.plugin(SystemPrompt)
-    await ctx.plugin(ToolRegistry)
-    await ctx.plugin(AgentRegistry)
-    await ctx.plugin(BashEnvPlugin)
-    await ctx.plugin(PowershellDialectExecutor)
-    await expect(ctx.plugin(ToolBash)).rejects.toThrow("the mounted executor speaks 'powershell', not bash")
-  })
-
   it('registers the bash schema with run_in_background exposed by default', async () => {
     const ctx = await setup()
     const schemas = ctx.tools.schemas()
@@ -1084,8 +1067,6 @@ describe('the model-facing bash tool builds its request from named args only (no
    * hands back an already-settled fake handle so the task registration completes.
    */
   class RecordingBashExecutor extends BashExecutor {
-    readonly dialect = 'bash' as const
-
     readonly requests: BashExecRequest[] = []
     resolve(request: BashExecRequest): BashExecSpec {
       this.requests.push(request)

packages/bash/tool-pwsh/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/bash/tool-pwsh/README.md
-README.md: 7bc1c0998a67ee772ec54eb46bebed52e5164588
-README.zh.md: 4f74b7cb4b737fd4c4f788586568676423f59cd4
+README.md: dfe26a63684d61dcdd6f969c2c2261dac79325c7
+README.zh.md: 2344f8477e5b15f2c4d366dd82b46358eacbc1b7

packages/bash/tool-pwsh/README.md

@@ -4,7 +4,7 @@ English | [中文](README.zh.md)
 
 The model-facing `pwsh` tool registered over the `ctx.bash` executor seam. Intended for Windows compositions where a PowerShell executor (e.g. `@deepseek-ai/dsh-pwsh-local`) backs `ctx.bash`; the tool contract is PowerShell-dialect: native `C:\...` paths and `$env:NAME` variables. Behavior mirrors `dsh-tool-bash` call-for-call minus the sandbox surface — foreground and `run_in_background` execution through the generic task runtime, the managed `DSH_*` environment through the shared `bash-env` registry, and the bash marker/truncation rendering story (a clean exit produces no marker).
 
-Requires a loaded executor implementation and the `bash-env` plugin; the tool stays pending until both exist (`inject: ['tools', 'bash', 'systemPrompt', 'bashEnv']`), and rejects an executor whose `dialect` is not `powershell` at load — a PowerShell command handed to `bash -c` would surface as an ordinary nonzero exit.
+Requires a loaded executor implementation and the `bash-env` plugin; the tool stays pending until both exist (`inject: ['tools', 'bash', 'systemPrompt', 'bashEnv']`).
 
 The package root exposes only the Cordis plugin contract (`name`, `inject`, `Config`, `apply`); result rendering (`src/render.ts`) and background-task adaptation (`src/background.ts`) mirror the bash tool's structure and stay reachable through the package's `./src/*` export.
 

packages/bash/tool-pwsh/README.zh.md

@@ -4,7 +4,7 @@
 
 注册在 `ctx.bash` 执行器 seam 之上的模型可见 `pwsh` 工具。面向由 PowerShell 执行器（如 `@deepseek-ai/dsh-pwsh-local`）支撑 `ctx.bash` 的 Windows 组合；工具契约是 PowerShell 方言：原生 `C:\...` 路径与 `$env:NAME` 变量。行为与 `dsh-tool-bash` 逐调用对齐、减去 sandbox 面——通过通用任务运行时执行前台与 `run_in_background`、通过共享 `bash-env` 注册表管理 `DSH_*` 环境、以及 bash 的 marker/截断渲染故事（干净退出不产生 marker）。
 
-需要已加载的执行器实现与 `bash-env` 插件；两者都存在前工具保持 pending（`inject: ['tools', 'bash', 'systemPrompt', 'bashEnv']`），并在加载时拒绝 `dialect` 不为 `powershell` 的执行器——PowerShell 命令被交给 `bash -c` 只会表现为普通的非零退出。
+需要已加载的执行器实现与 `bash-env` 插件；两者都存在前工具保持 pending（`inject: ['tools', 'bash', 'systemPrompt', 'bashEnv']`）。
 
 包根只导出 Cordis 插件契约（`name`、`inject`、`Config`、`apply`）；结果渲染（`src/render.ts`）与后台任务适配（`src/background.ts`）镜像 bash 工具的结构，并可通过包的 `./src/*` 导出访问。
 

packages/bash/tool-pwsh/src/index.ts

@@ -138,11 +138,6 @@ const BACKGROUND_OUTPUT_PROPERTIES = {
 /* jscpd:ignore-end */
 
 export function apply(ctx: Context, config: Config = {}): void {
-  // Model commands are written in PowerShell; a mismatched executor would
-  // hand them to bash and surface as ordinary nonzero exits.
-  if (ctx.bash.dialect !== 'powershell') {
-    throw new Error(`tool-pwsh: the mounted executor speaks '${ctx.bash.dialect}', not powershell — mount dsh-pwsh-local or the matching shell tool`)
-  }
   const backgroundEnabled = config.enableRunInBackground ?? true
 
   ctx.systemPrompt.section({

packages/bash/tool-pwsh/tests/tools.spec.ts

@@ -23,7 +23,7 @@ import AgentRegistry from '@deepseek-ai/dsh-agent'
 import type { Agent } from '@deepseek-ai/dsh-agent'
 import { SessionId } from '@deepseek-ai/dsh-session'
 import { BashExecutor } from '@deepseek-ai/dsh-bash'
-import type { BashExecRequest, BashExecSpec, BashProcess, BashRunResult, ShellDialect } from '@deepseek-ai/dsh-bash'
+import type { BashExecRequest, BashExecSpec, BashProcess, BashRunResult } from '@deepseek-ai/dsh-bash'
 import * as ToolPwsh from '@deepseek-ai/dsh-tool-pwsh'
 import * as BashEnvPlugin from '@deepseek-ai/dsh-bash-env'
 import type { BashProcessRead } from '@deepseek-ai/dsh-bash'
@@ -38,8 +38,6 @@ const testToolSignal = new AbortController().signal
  * handle.
  */
 class FakeBash extends BashExecutor {
-  readonly dialect: ShellDialect = 'powershell'
-
   requests: BashExecRequest[] = []
   specs: BashExecSpec[] = []
   startCalls = 0
@@ -201,19 +199,6 @@ async function callUntilText(
 }
 
 describe('registration', () => {
-  it('rejects an executor speaking another shell dialect at load', async () => {
-    class BashDialectExecutor extends FakeBash {
-      override readonly dialect = 'bash' as const
-    }
-    const ctx = new Context()
-    await ctx.plugin(SystemPrompt)
-    await ctx.plugin(ToolRegistry)
-    await ctx.plugin(AgentRegistry)
-    await ctx.plugin(BashEnvPlugin)
-    await ctx.plugin(BashDialectExecutor)
-    await expect(ctx.plugin(ToolPwsh)).rejects.toThrow("the mounted executor speaks 'bash', not powershell")
-  })
-
   it('registers the pwsh tool with its prompt section and schema', async () => {
     const { ctx } = await setup()
     const schema = ctx.tools.schemas().find(s => s.name === 'pwsh')

packages/context/tmux-context/tests/tmux-context.spec.ts

@@ -48,8 +48,6 @@ function runResult(stdout: string, overrides: Partial<BashRunResult> = {}): Bash
 
 /** A scriptable fake `ctx.bash` recording the command it was asked to run. */
 class FakeBash extends BashExecutor {
-  readonly dialect = 'bash' as const
-
   commands: string[] = []
   result: BashRunResult = runResult(`${tmuxLine()}\n`)
   runError?: Error