fix: resolve codex-acp binary path on Windows by appending .exe extension

[Basit-Balogun10]

Problem

Closes #2445

On Windows, getCodexBinaryPath() looks for the binary at .vite/build/codex-acp/codex-acp — without the .exe extension. The file on disk is codex-acp.exe, so the lookup always fails and the Codex adapter cannot start.

The error thrown is:

codex-acp binary not found at ...\apps\code\.vite\build\codex-acp\codex-acp.
Run "node apps/code/scripts/download-binaries.mjs" to download it.

This causes the session to fall back to Claude silently, even when the user has explicitly selected a Codex/OpenAI model and the binary is present.

Note: the Claude binary path (line 341) already handles this correctly with a platform check — this fix applies the same pattern to the Codex binary.

Changes

Added a process.platform === "win32" check to getCodexBinaryPath(), matching the existing pattern in getClaudeBinaryPath():

// Before
private getCodexBinaryPath(): string {
  return this.bundledResources.resolve(".vite/build/codex-acp/codex-acp");
}

// After
private getCodexBinaryPath(): string {
  const binary = process.platform === "win32" ? "codex-acp.exe" : "codex-acp";
  return this.bundledResources.resolve(`.vite/build/codex-acp/${binary}`);
}

How did you test this?

Tested manually on Windows 11 (WSL2 dev environment) running the dev build (pnpm start from the worktree):

1. Downloaded codex-acp.exe via node apps/code/scripts/download-binaries.mjs
2. Before fix: selecting a Codex model (gpt-5.4) at task creation always fell back to Claude with the binary-not-found error in logs
3. After fix: [CodexAcpAgent] Spawning codex-acp process appears in logs, task runs successfully through OpenAI

Publish to changelog?

no

[greptile-apps]

_{Reviews (1): Last reviewed commit: "fix: resolve codex-acp binary path on Wi..." | Re-trigger Greptile}

[k11kirky]

Nice

[k11kirky]

Hey @Basit-Balogun10 - you will need to sign these commits in order for us to merge it, or ill have to recreate the change with a signed commit of my own (which will remove your contribution label)

[Basit-Balogun10]

Hi @k11kirky
Thanks, just signed the commit!

[k11kirky]

@Basit-Balogun10 Thanks, youll need to do that with the other PR's too!

[Basit-Balogun10]

Oh yeah, on it already, thanks!