Add missing Azure provider documentation to .NET SDK

[Copilot]

Workflow run #21486968231 failed due to branch deletion race condition, preventing review of PR #260 which updated Azure provider docs in Node.js, Python, and Go SDKs but not .NET.

Changes

• dotnet/README.md: Expanded BYOK section with Azure OpenAI configuration examples and critical notes

  • Added ProviderConfig field reference (Type, BaseUrl, ApiKey, Azure options)
  • Added Ollama local provider example
  • Added Azure OpenAI example with required Type = "azure" (not "openai")
  • Documented BaseUrl format requirement (host only, no /openai/v1 path)
  • Clarified Model parameter requirement for custom providers

• docs/workflow-failure-analysis.md: Root cause analysis and resolution tracking for gh-aw checkout race condition

Example

var session = await client.CreateSessionAsync(new SessionConfig
{
    Model = "gpt-4",
    Provider = new ProviderConfig
    {
        Type = "azure",  // Must be "azure" for Azure endpoints
        BaseUrl = "https://my-resource.openai.azure.com",  // Host only
        ApiKey = Environment.GetEnvironmentVariable("AZURE_OPENAI_KEY"),
        Azure = new AzureProviderOptions { ApiVersion = "2024-10-21" }
    }
});

All four SDKs now have consistent Azure provider documentation.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[agentics] SDK Consistency Review Agent failed</issue_title>
<issue_description>### Workflow Failure

Workflow: SDK Consistency Review Agent
Branch: provider-info
Run URL: https://github.com/github/copilot-sdk/actions/runs/21486968231

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• expires on Feb 5, 2026, 4:51 PM UTC

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• Fixes [agentics] SDK Consistency Review Agent failed #262

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