Wsl Ubuntu error: Agent server started but is not accepting connections

### Description

Hello,

I am trying to run agentcore dev in a wsl Ubuntu on Windows and 8/10 times I get the following error:

The only way to avoid this and actually run the dev UI properly is to keep stopping and starting agentcore dev again until it starts working.

### Steps to Reproduce

1. run wsl -d Ubuntu
2. run agentcore dev
3. Wait until you get the error
4. Keep relauching the dev server until the server starts normally

### Expected Behavior

I expect the dev server to start on the first try

### Actual Behavior

The server only starts after relauching it and getting the error a number of times, and the number is always different, which suggest it's a random one.

### CLI Version

0.26.0

### Operating System

Windows

### Additional Context

The cli is run is Ubuntu wsl. The log files are not populated when the error occurs.

Start by reproducing `agentcore dev` from WSL Ubuntu on Windows, using the reported CLI version 0.26.0 and checking the startup behavior across repeated launches. No source file or test is named; done means the dev server accepts connections on the first attempt and the relevant logs are populated when startup fails.

Written by the indexing model from the issue text.