Fix timer bounds and ACP teardown ownership

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

@@ -18,7 +18,7 @@ import z from 'schemastery'
 import { BashExecutor } from '@deepseek-ai/dsh-bash'
 import type { BashExecRequest, BashExecSpec, BashProcess, BashProcessRead, BashRunResult, CollectedOutput } from '@deepseek-ai/dsh-bash'
 import type { SubprocessCollect, SubprocessHandle, SubprocessOutputReader, SubprocessSpawnSpec } from '@deepseek-ai/dsh-subprocess'
-import { clampTimeout, deadline, timeoutOf } from '@deepseek-ai/dsh-timeout'
+import { clampTimeout, deadline, MAX_TIMER_DELAY_MS, timeoutOf } from '@deepseek-ai/dsh-timeout'
 import { resolvePwshPath } from './resolve.ts'
 
 /* jscpd:ignore-start -- deliberate call-for-call mirror of dsh-bash-local (Agent Note: pwsh-tool-and-executor). */
@@ -62,7 +62,7 @@ export interface Config {
   maxOutputBytes?: number
   /** Per-stream spill-file cap; larger streams retain only their in-memory tail. */
   maxSpillBytes?: number
-  /** Grace period for kill escalation and for inherited pipes after shell exit. */
+  /** Grace period for kill escalation and inherited pipes; at most `MAX_TIMER_DELAY_MS`. */
   graceMs?: number
   /**
    * Explicit pwsh executable. When omitted, well-known Windows install
@@ -129,6 +129,9 @@ export class PwshLocalExecutor extends BashExecutor {
     assertPositiveFinite('maxOutputBytes', this.config.maxOutputBytes)
     assertPositiveFinite('maxSpillBytes', this.config.maxSpillBytes)
     assertPositiveFinite('graceMs', this.config.graceMs)
+    if (this.config.graceMs > MAX_TIMER_DELAY_MS) {
+      throw new Error(`pwsh-local: graceMs must be no greater than ${MAX_TIMER_DELAY_MS}`)
+    }
     this.pwshPath = resolvePwshPath(this.config.pwshPath)
   }