fix(cli): write Codex bin command shims on Windows

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/cli/install-codex/codex-cache.test.ts

@@ -44,4 +44,24 @@ describe("codex-cache", () => {
     const linkedTarget = await readlink(join(binDir, "omo-hook"))
     expect(linkedTarget).toBe(join(pluginRoot, "dist", "cli.js"))
   })
+
+  test("writes Windows command shims for cached plugin bins", async () => {
+    // given
+    const root = await mkdtemp(join(tmpdir(), "omo-codex-cache-"))
+    const pluginRoot = join(root, "plugin")
+    const binDir = join(root, "bin")
+    await mkdir(pluginRoot, { recursive: true })
+    await writeFile(join(pluginRoot, "package.json"), JSON.stringify({ name: "@scope/omo", bin: { "omo-hook": "dist/cli.js" } }))
+    await mkdir(join(pluginRoot, "dist"), { recursive: true })
+    await writeFile(join(pluginRoot, "dist", "cli.js"), "#!/usr/bin/env node\n")
+
+    // when
+    const linked = await linkCachedPluginBins({ binDir, pluginRoot, platform: "win32" })
+
+    // then
+    expect(linked).toEqual([{ name: "omo-hook", path: join(binDir, "omo-hook.cmd"), target: join(pluginRoot, "dist", "cli.js") }])
+    const commandShim = await readFile(join(binDir, "omo-hook.cmd"), "utf8")
+    expect(commandShim).toContain("@echo off")
+    expect(commandShim).toContain(`node "${join(pluginRoot, "dist", "cli.js")}" %*`)
+  })
 })

src/cli/install-codex/codex-cache.ts

@@ -2,6 +2,8 @@ import { cp, lstat, mkdir, readFile, readdir, readlink, rename, rm, symlink, wri
 import { basename, dirname, join, sep } from "node:path"
 import type { InstalledPlugin, RunCommand } from "./types"
 
+type LinkPlatform = NodeJS.Platform
+
 export async function installCachedPlugin(input: {
   readonly codexHome: string
   readonly marketplaceName: string
@@ -38,18 +40,34 @@ export async function pruneMarketplaceCache(input: {
 export async function linkCachedPluginBins(input: {
   readonly binDir: string
   readonly pluginRoot: string
+  readonly platform?: LinkPlatform
 }): Promise<readonly { name: string; path: string; target: string }[]> {
   const binLinks = await discoverPackageBins(input.pluginRoot)
   await mkdir(input.binDir, { recursive: true })
   const linked: Array<{ name: string; path: string; target: string }> = []
   for (const link of binLinks) {
-    const linkPath = join(input.binDir, link.name)
+    const linkPath = await linkCachedPluginBin(input.binDir, link, input.platform ?? process.platform)
-    await replaceSymlink(linkPath, link.target)
     linked.push({ name: link.name, path: linkPath, target: link.target })
   }
   return linked
 }
 
+async function linkCachedPluginBin(
+  binDir: string,
+  link: { readonly name: string; readonly target: string },
+  platform: LinkPlatform,
+): Promise<string> {
+  if (platform === "win32") {
+    const linkPath = join(binDir, `${link.name}.cmd`)
+    await replaceCommandShim(linkPath, link.target)
+    return linkPath
+  }
+
+  const linkPath = join(binDir, link.name)
+  await replaceSymlink(linkPath, link.target)
+  return linkPath
+}
+
 export async function rewriteCachedMcpManifest(pluginRoot: string): Promise<void> {
   const manifestPath = join(pluginRoot, ".mcp.json")
   if (!(await exists(manifestPath))) return
@@ -143,6 +161,21 @@ async function replaceSymlink(linkPath: string, targetPath: string): Promise<voi
   await symlink(targetPath, linkPath)
 }
 
+async function replaceCommandShim(linkPath: string, targetPath: string): Promise<void> {
+  if (await existingNonShim(linkPath)) throw new Error(`${linkPath} already exists and is not a command shim`)
+  await writeFile(linkPath, `@echo off\r\nnode "${targetPath}" %*\r\n`)
+}
+
+async function existingNonShim(path: string): Promise<boolean> {
+  try {
+    const stat = await lstat(path)
+    return !stat.isFile()
+  } catch (error) {
+    if (isNodeErrorWithCode(error) && error.code === "ENOENT") return false
+    throw error
+  }
+}
+
 async function existingNonSymlink(path: string): Promise<boolean> {
   try {
     const stat = await lstat(path)