[Bug]: Codex provider fails to initialize with "Invalid payload for method 'initialize' during 'decode-payload'"

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

Not sure

Steps to reproduce

1. Start t3code on Windows.
2. Open the Codex provider / try to connect to Codex.
3. Send a prompt or start a new Codex turn.
4. The provider fails before the turn starts.

Expected behavior

Codex should initialize correctly and connect/start the provider turn without error.

Actual behavior

Codex fails to connect/start. The UI shows:

ProviderAdapterProcessError: Provider adapter process error (codex) for thread ...:
Invalid payload for method 'initialize' during 'decode-payload'

Also shown:

Codex app-server provider probe failed:
Invalid payload for method 'initialize' during 'decode-payload'.

Provider turn start failed.

Impact

Blocks work completely

Version or commit

No response

Environment

• OS: Windows - App: t3code - Provider: Codex - Version: 0.0.33

Logs or stack traces

Screenshots, recordings, or supporting files

No response

Workaround

No response

Start by reproducing the Codex provider connection on Windows with t3code 0.0.33, then trace the provider adapter process and app-server provider probe around the initialize payload. The fix is complete when Codex initializes, connects, and starts a provider turn without the decode-payload error.