Add Windows portability guards for workspace flows (#1311)

* Add Windows portability guards for workspace flows

* Increase snapshot workflow timeout

* Trigger CI after timeout update

* Fix windows portability PR after main merge

---------

Co-authored-by: neubig <398875+neubig@users.noreply.github.com>

scripts/run-staged-typecheck.mjs

@@ -0,0 +1,44 @@
+#!/usr/bin/env node
+import { spawnSync } from "node:child_process";
+import { existsSync } from "node:fs";
+import { dirname, join } from "node:path";
+
+function getNpmInvocation() {
+  if (process.platform !== "win32") {
+    return { command: "npm", args: ["run", "typecheck:staged"] };
+  }
+
+  const npmCliPath =
+    process.env.npm_execpath ??
+    join(dirname(process.execPath), "node_modules", "npm", "bin", "npm-cli.js");
+
+  if (existsSync(npmCliPath)) {
+    return {
+      command: process.execPath,
+      args: [npmCliPath, "run", "typecheck:staged"],
+    };
+  }
+
+  return {
+    command: process.env.ComSpec ?? "cmd.exe",
+    args: ["/d", "/s", "/c", "npm run typecheck:staged"],
+  };
+}
+
+const { command, args } = getNpmInvocation();
+
+const result = spawnSync(command, args, {
+  stdio: "inherit",
+  windowsHide: true,
+});
+
+if (result.error) {
+  throw result.error;
+}
+
+if (result.signal) {
+  console.error(`typecheck:staged terminated by signal ${result.signal}`);
+  process.exit(1);
+}
+
+process.exit(result.status ?? 1);