Windows: generated junie.bat fails with "The system cannot find the batch label specified - after_channel_oneshot"

# Windows: generated `junie.bat` fails with `The system cannot find the batch label specified - after_channel_oneshot`

## Description

After installing Junie CLI on Windows using the official `install.ps1` script, running `junie --help` fails with the following error:

```text
The system cannot find the batch label specified - after_channel_oneshot
```

The issue was reproducible even after removing Junie and reinstalling it.

It looks like the generated Windows batch shim file `junie.bat` may be written with line endings that are not handled correctly by `cmd.exe`.

Rewriting the generated `junie.bat` file with Windows CRLF line endings fixed the issue.

## Environment

* OS: Windows 11
* Shell: PowerShell
* Junie command resolved to: `C:\Users\andre\.local\bin\junie.bat`

## Installation command

```powershell
powershell -NoProfile -ExecutionPolicy Bypass -Command "iex (irm 'https://junie.jetbrains.com/install.ps1')"
```

## Steps to reproduce

1. Install Junie CLI on Windows using the official installer:

```powershell
powershell -NoProfile -ExecutionPolicy Bypass -Command "iex (irm 'https://junie.jetbrains.com/install.ps1')"
```

2. Run:

```powershell
junie --help
```

## Actual result

The command fails with:

```text
The system cannot find the batch label specified - after_channel_oneshot
```

## Expected result

`junie --help` should work immediately after installation.

## Diagnostics

`where.exe junie` output:

```text
C:\Users\andre\.local\bin\junie.bat
```

`Get-Command junie -All` output:

```text
CommandType Name Version Source
----------- ---- ------- ------
Application junie.bat 0.0.0.0 C:\Users\andre\.local\bin\junie.bat
```

So there does not appear to be another `junie` executable earlier in `PATH`. The command resolves only to the generated batch file:

```text
C:\Users\andre\.local\bin\junie.bat
```

## Workaround

The issue was fixed by rewriting the generated `junie.bat` file with Windows CRLF line endings:

```powershell
$p = "$env:USERPROFILE\.local\bin\junie.bat"

Copy-Item $p "$p.bak" -Force

$text = [System.IO.File]::ReadAllText($p)
$text = $text -replace "`r?`n", "`r`n"

$utf8NoBom = [System.Text.UTF8Encoding]::new($false)
[System.IO.File]::WriteAllText($p, $text, $utf8NoBom)

junie --help
```

After this, `junie --help` started working correctly.

## Additional notes

This seems to indicate that the generated Windows batch shim may need to be written explicitly with CRLF line endings.

The batch file appears to jump to the `:after_channel_oneshot` label, but before normalizing line endings, `cmd.exe` fails with:

```text
The system cannot find the batch label specified - after_channel_oneshot
```

After converting line endings to CRLF, the same generated batch file works correctly.