code-model-v1 not created

I tried to generate ARM client files using swagger.json through autorest using

autorest readme.md --use:@microsoft.azure/autorest.csharp@2.3.82

readme.md:

```
### Prerequisites

1. Update the `swagger.json`. [See notes](#Swagger-notes).
2. Install AutoRest.

#Generate ARM client.
1. Navigate to \src\ServiceARMClient\client\v2025-03-30-preview
2. Run > `autorest --v3 readme.md --version=3.0.6274`

### Important notes
1. Update the swagger.son with meaningful operationId, as this will be backbone for the generated client method names.
2. In the generated client code replace,
` List _queryParameters = new List();`
with
` List _queryParameters = new List { "api-version=2024-03-03-preview" };`

# This is the configuration block for the Autorest.
``` yaml
# list all the input OpenAPI files (may be YAML, JSON, or Literate- OpenAPI markdown)
verbose: true
input-file: swagger.json
output-folder: Generated
clear-output-folder: true
csharp: true
namespace: Microsoft.Azure.ServiceClient.v2025_03_30_preview
azure-arm: true
license-header: "MICROSOFT_MIT_NO_VERSION"
legacy: true
```

The command created all the files and models but didn't generated code-model-v1, why so?

Start with readme.md and swagger.json, then reproduce the documented `autorest --v3 readme.md --version=3.0.6274` command. Inspect the generated output and command diagnostics to determine why `code-model-v1` is absent; done means identifying whether this is expected behavior or a configuration or generation failure.

Written by the indexing model from the issue text.