Windows CLI hangs after model selection, while Web UI works normally

### Description

## Windows CLI hangs after model selection, while Web UI works normally

### Environment

* OS: Windows 11
* Node.js: v24.14.1
* pnpm: v11.18.0 (via Corepack)
* OpenCode: v1.18.10

### Problem

The Web UI works correctly and can generate responses.

However, the CLI hangs indefinitely when running:

```bash
opencode run "hello"
```

or

```bash
opencode run "hello" --pure --print-logs --log-level DEBUG
```

No response is ever returned.

### Debug logs

The logs always stop after model selection:

```text
message=stream providerID=opencode modelID=deepseek-v4-flash-free
message="llm runtime selected" llm.runtime=ai-sdk llm.provider=opencode llm.model=deepseek-v4-flash-free
```

Nothing is printed after this, even after waiting several minutes.

The same behavior previously occurred with:

```
big-pickle
```

### Things I already tried

* Fresh installation
* Removed and reinstalled OpenCode
* Switched to Corepack-managed pnpm
* `--pure` mode
* Different default models
* Verified internet connectivity
* Web UI works normally on the same machine

### Expected behavior

`opencode run "hello"` should return a response in the terminal.

### Actual behavior

The CLI hangs forever after selecting the model, while the Web UI continues to function normally.

Please let me know if you'd like me to test a nightly build or provide additional logs.


### Plugins

_No response_

### OpenCode version

_No response_

### Steps to reproduce

_No response_

### Screenshot and/or share link

_No response_

### Operating System

_No response_

### Terminal

_No response_

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Windows CLI hangs after model selection, while Web UI works normally #39859

Description