.NET: LocalVariable Naming Convention in LocalEvaluation

@alliscode is already working on this.

Since Jun 16, 2026.

## Summary
Correct the naming conventions of local variables in the `src/Evaluation/LocalEvalutation.cs` file to conform to the C# naming standards.

## Code
in `src/Evaluation/LocalEvalutation.cs`

```C#
public Task EvaluateAsync(
IReadOnlyList items,
string evalName = "Local Eval",
CancellationToken cancellationToken = default)
{
var results = new List(items.Count);

foreach (var item in items)
{
cancellationToken.ThrowIfCancellationRequested();

var evalResult = new EvaluationResult();

foreach (var check in this._checks)
{
// EvalCheckResult -> evalCheckResult
var evalCheckResult = check(item);
evalResult.Metrics[evalCheckResult.CheckName] = new BooleanMetric(
evalCheckResult.CheckName,
evalCheckResult.Passed,
reason: evalCheckResult.Reason)
{
Interpretation = new EvaluationMetricInterpretation
{
Rating = evalCheckResult.Passed
? EvaluationRating.Good
: EvaluationRating.Unacceptable,
Failed = !evalCheckResult.Passed,
},
};
}

results.Add(evalResult);
}

return Task.FromResult(new AgentEvaluationResults(this.Name, results, inputItems: items));
}
```