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/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')