Workspace creation fails with "options.value must be a string" when model secret is resolved from extension config

[serbangeorge-m]

Bug description

Creating an agent workspace with a model whose API key is stored via the extension configuration system (e.g. configured through the provider's settings page) fails with:

Error while creating workspace: options.value must be a string

Operating system

macOS

Installation Method

None

Version

next (development version)

Steps to reproduce

Steps to reproduce:

1. Open Kaiden
2. Configure an inference provider through its settings page (e.g. Gemini, Anthropic, or OpenAI)
3. Go to Agent Workspaces and create a new workspace
4. Select the configured model
5. Click "Start Workspace"
6. Error dialog appears: "Error while creating workspace: options.value must be a string"

Relevant log output

Additional context

No response

[jeffmaury]

Might be #2199

[jeffmaury]

Might be just a verification issue