feat: make npm package install work on windows (#2419)

packages/opencode/script/preinstall.mjs

@@ -0,0 +1,32 @@
+#!/usr/bin/env node
+
+import fs from "fs"
+import path from "path"
+import os from "os"
+import { fileURLToPath } from "url"
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+
+function main() {
+  if (os.platform() !== "win32") {
+    console.log("Non-Windows platform detected, skipping preinstall")
+    return
+  }
+
+  const binDir = path.join(__dirname, "bin")
+  const unixScript = path.join(binDir, "opencode")
+
+  console.log("Windows detected: Configuring bin scripts for Windows")
+
+  if (fs.existsSync(unixScript)) {
+    console.log("Removing Unix shell script from bin/")
+    fs.unlinkSync(unixScript)
+  }
+}
+
+try {
+  main()
+} catch (error) {
+  console.error("Preinstall script error:", error.message)
+  process.exit(0)
+}