[Bug]: Codex provider fails to initialize with "Invalid payload for method 'initialize' during 'decode-payload'" #8146

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