Codex review hangs indefinitely on Windows with Git Bash shell

[0xZOne]

Environment

• OS: Windows 11 Pro 10.0.22631
• Claude Code shell: Git Bash (bash)
• Plugin version: 1.0.1
• Codex CLI: codex-cli 0.118.0
• Node.js: v22.17.0

Problem

Codex review jobs hang indefinitely on Windows when Claude Code is configured to use Git Bash. Reviews run for 10h–87h+ without completing.

Symptoms

1. Shell commands are repeatedly "declined" (exit -1), even trivial ones like Write-Output hi and git status -v
2. Commands are routed through PowerShell (C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe) despite the user's shell being Git Bash
3. Reviews that can't execute shell commands fall back to MCP/LSP tools but get stuck in "investigating" phase indefinitely
4. Some review sessions can execute commands (exit 0) while others in the same session cannot — inconsistent behavior

Log Examples

Progress:
  Running command: powershell.exe -Command 'Write-Output hi'
  Command declined: powershell.exe -Command 'Write-Output hi' (exit -1)
  Running command: powershell.exe -Command 'git status -v'
  Command declined: powershell.exe -Command 'git status -v' (exit -1)
  Calling omx_code_intel/lsp_document_symbols.
  # ... stuck in investigating for 10+ hours

Root Cause Analysis

In lib/app-server.mjs (~L190) and process.mjs (~L7):

shell: process.platform === "win32"

On Windows, spawn() with shell: true uses cmd.exe by default. The Codex app-server then defaults to PowerShell for subprocess execution, which doesn't match the user's configured Git Bash environment. This causes a shell mismatch where commands are declined or fail silently.

Suggested Fix

Respect the user's configured shell environment instead of hard-coding Windows shell detection:

// Use SHELL env var if available (Git Bash sets this)
const shell = process.platform === "win32"
  ? (process.env.SHELL || true)
  : false;

Steps to Reproduce

1. Install Claude Code on Windows 11
2. Configure Claude Code to use Git Bash as the shell
3. Install the Codex plugin (/plugin install codex@openai-codex)
4. Run /codex:review
5. Observe the review hanging in "running" or "investigating" phase with shell commands being declined

Workaround

None found. The review never completes on this configuration.