`AutomaticInputRequiredStatusTests.TaskStatus_TransitionsToInputRequired_DuringElicitAsync` intermittently fails (timing/race)

https://github.com/modelcontextprotocol/csharp-sdk/actions/runs/21503213903/job/61953813945?pr=1070

```
  Failed ModelContextProtocol.Tests.Server.AutomaticInputRequiredStatusTests.TaskStatus_TransitionsToInputRequired_DuringElicitAsync [550 ms]
  Error Message:
   Assert.Equal() Failure: Values differ
Expected: Completed
Actual:   InputRequired
  Stack Trace:
     at ModelContextProtocol.Tests.Server.AutomaticInputRequiredStatusTests.TaskStatus_TransitionsToInputRequired_DuringElicitAsync() in /_/tests/ModelContextProtocol.Tests/Server/AutomaticInputRequiredStatusTests.cs:line 228
   at ModelContextProtocol.Tests.Server.AutomaticInputRequiredStatusTests.TaskStatus_TransitionsToInputRequired_DuringElicitAsync() in /_/tests/ModelContextProtocol.Tests/Server/AutomaticInputRequiredStatusTests.cs:line 228
--- End of stack trace from previous location ---
```

https://github.com/modelcontextprotocol/csharp-sdk/blob/f9dec13660fb7052cf65bff4e72d85945d38615c/tests/ModelContextProtocol.Tests/Server/AutomaticInputRequiredStatusTests.cs#L215-L228

It looks to me like the task briefly transitioned status from Working to InputRequired and this caused the test to stop polling.  The test then failed when it expected the test to transition to Completed.

	do
	{
	await Task.Delay(100, TestContext.Current.CancellationToken);
	finalStatus = await taskStore.GetTaskAsync(mcpTask.TaskId, cancellationToken: TestContext.Current.CancellationToken);
	maxAttempts--;
	}
	while (finalStatus?.Status == McpTaskStatus.Working && maxAttempts > 0);

	// Assert - Status should have been InputRequired during elicitation
	Assert.Contains(McpTaskStatus.InputRequired, statusesDuringElicitation);

	// Final status should be Completed
	Assert.NotNull(finalStatus);
	Assert.Equal(McpTaskStatus.Completed, finalStatus.Status);

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`AutomaticInputRequiredStatusTests.TaskStatus_TransitionsToInputRequired_DuringElicitAsync` intermittently fails (timing/race) #1222

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AutomaticInputRequiredStatusTests.TaskStatus_TransitionsToInputRequired_DuringElicitAsync intermittently fails (timing/race) #1222

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`AutomaticInputRequiredStatusTests.TaskStatus_TransitionsToInputRequired_DuringElicitAsync` intermittently fails (timing/race) #1222