`LangGraph Toolbox` local invoke fails due to missing model deployment

Description:
When testing Scenario 3: LangGraph Toolbox (Responses), after azd ai agent run successfully started locally, executing the local invocation command azd ai agent invoke --local --protocol responses "What tools do you have?" failed. The local log showed the error: "DeploymentNotFound. The API deployment for this resource does not exist". See the image below for details.

Steps to Reproduce:

1. mkdir langgraph-toolbox and cd langgraph-toolbox
2. Run azd ai agent init --manifest "https://github.com/microsoft-foundry/foundry-samples/blob/main/samples/python/hosted-agents/bring-your-own/responses/langgraph-toolbox/agent.manifest.yaml" and cd toolbox-langgraph.
3. Run azd up.
4. Run $env:TOOLBOX_ENDPOINT = (azd env get-value TOOLBOX_AGENT_TOOLS_MCP_ENDPOINT).
5. Run azd ai agent run.
6. From a second terminal, run azd ai agent invoke --local --protocol responses "What tools do you have?".

Environment:

• Azd version: azd version 1.26.0-beta.1-daily.6390926 (commit e512582181cc655be568c4b6c587daa47a987bd3) (daily).
• AI Agent Extension version: 0.1.37-preview
• Manifest URL: https://github.com/microsoft-foundry/foundry-samples/blob/main/samples/python/hosted-agents/bring-your-own/responses/langgraph-toolbox/agent.manifest.yaml"
• OS: Windows
• Location: northcentralus.

Expected Behavior:
Local invoke can succeed.

@JeffreyCA and @RickWinter for notification.