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-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)