[Bug]: Retry on network errors before giving up

### I have done the following

- [x] I have searched the existing issues
- [x] If possible, I've reproduced the issue using the 'main' branch of this project

### Steps to reproduce

1. Pull a large ~30 GB image (an exact link isn't disclosed).

### Problem description

This fails with:
```
Error: StreamClosed(streamID: HTTP2StreamID(45), errorCode: HTTP2ErrorCode<0x1 ProtocolError>, location: "NIOHTTP2/HTTP2StreamChannel.swift:892")
```
Or just:
```
Error: HTTPClientError.remoteConnectionClosed
```

### Environment

```markdown
- OS: macOS
- Container: commit 6e65319
```

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct

Start by reproducing the failure while pulling a large image, then trace the reported NIOHTTP2/HTTP2StreamChannel.swift:892 error and HTTPClientError.remoteConnectionClosed through the container's image-pull path. Done means transient network failures retry before the pull gives up, while the reported errors remain covered by tests.

Written by the indexing model from the issue text.