spawn codex ENOENT on Windows — app-server.mjs missing shell: true

[massimotodaro]

Bug

All plugin commands (/codex:review, /codex:adversarial-review, /codex:rescue) fail on Windows with:

spawn codex ENOENT

Environment

• Windows 11
• Node.js 22.x
• Codex CLI 0.118.0 (installed globally via npm, works fine from terminal)
• Claude Code (latest)

Root Cause

scripts/lib/app-server.mjs line 188 spawns codex without shell: true:

this.proc = spawn("codex", ["app-server"], {
  cwd: this.cwd,
  env: this.options.env,
  stdio: ["pipe", "pipe", "pipe"]
});

On Windows, npm install -g @openai/codex creates codex.cmd (not a bare codex binary). Node's spawn without shell: true cannot resolve .cmd wrappers — only shell: true or execSync/spawnSync with shell mode can.

The fix already exists in the same codebase — scripts/lib/process.mjs line 11 correctly handles this:

shell: process.platform === "win32"

But app-server.mjs doesn't apply the same pattern.

Fix

- this.proc = spawn("codex", ["app-server"], {
-   cwd: this.cwd,
-   env: this.options.env,
-   stdio: ["pipe", "pipe", "pipe"]
- });
+ this.proc = spawn("codex", ["app-server"], {
+   cwd: this.cwd,
+   env: this.options.env,
+   stdio: ["pipe", "pipe", "pipe"],
+   shell: process.platform === "win32"
+ });

This is the only spawn("codex", ...) call in the codebase, so this one-line change fixes all commands for Windows users.