fix(windows): use cross-spawn for shim-backed commands (#18010)

packages/opencode/src/util/process.ts

@@ -1,4 +1,5 @@
-import { spawn as launch, type ChildProcess } from "child_process"
+import { type ChildProcess } from "child_process"
+import launch from "cross-spawn"
 import { buffer } from "node:stream/consumers"
 
 export namespace Process {
@@ -113,6 +114,7 @@ export namespace Process {
       cwd: opts.cwd,
       env: opts.env,
       stdin: opts.stdin,
+      shell: opts.shell,
       abort: opts.abort,
       kill: opts.kill,
       timeout: opts.timeout,
@@ -140,6 +142,20 @@ export namespace Process {
     throw new RunFailedError(cmd, out.code, out.stdout, out.stderr)
   }
 
+  export async function stop(proc: ChildProcess) {
+    if (process.platform !== "win32" || !proc.pid) {
+      proc.kill()
+      return
+    }
+
+    const out = await run(["taskkill", "/pid", String(proc.pid), "/T", "/F"], {
+      nothrow: true,
+    })
+
+    if (out.code === 0) return
+    proc.kill()
+  }
+
   export async function text(cmd: string[], opts: RunOptions = {}): Promise<TextResult> {
     const out = await run(cmd, opts)
     return {