Add Policy DSL Validator, Schema Exporter, and Simulation Smoke tools

- Implemented PolicyDslValidator with command-line options for strict mode and JSON output.
- Created PolicySchemaExporter to generate JSON schemas for policy-related models.
- Developed PolicySimulationSmoke tool to validate policy simulations against expected outcomes.
- Added project files and necessary dependencies for each tool.
- Ensured proper error handling and usage instructions across tools.

src/StellaOps.Bench/LinkNotMerge.Vex/StellaOps.Bench.LinkNotMerge.Vex/Statistics.cs

@@ -0,0 +1,84 @@
+namespace StellaOps.Bench.LinkNotMerge.Vex;
+
+internal readonly record struct DurationStatistics(double MeanMs, double P95Ms, double MaxMs)
+{
+    public static DurationStatistics From(IReadOnlyList<double> values)
+    {
+        if (values.Count == 0)
+        {
+            return new DurationStatistics(0, 0, 0);
+        }
+
+        var sorted = values.ToArray();
+        Array.Sort(sorted);
+
+        var total = 0d;
+        foreach (var value in values)
+        {
+            total += value;
+        }
+
+        var mean = total / values.Count;
+        var p95 = Percentile(sorted, 95);
+        var max = sorted[^1];
+
+        return new DurationStatistics(mean, p95, max);
+    }
+
+    private static double Percentile(IReadOnlyList<double> sorted, double percentile)
+    {
+        if (sorted.Count == 0)
+        {
+            return 0;
+        }
+
+        var rank = (percentile / 100d) * (sorted.Count - 1);
+        var lower = (int)Math.Floor(rank);
+        var upper = (int)Math.Ceiling(rank);
+        var weight = rank - lower;
+
+        if (upper >= sorted.Count)
+        {
+            return sorted[lower];
+        }
+
+        return sorted[lower] + weight * (sorted[upper] - sorted[lower]);
+    }
+}
+
+internal readonly record struct ThroughputStatistics(double MeanPerSecond, double MinPerSecond)
+{
+    public static ThroughputStatistics From(IReadOnlyList<double> values)
+    {
+        if (values.Count == 0)
+        {
+            return new ThroughputStatistics(0, 0);
+        }
+
+        var total = 0d;
+        var min = double.MaxValue;
+
+        foreach (var value in values)
+        {
+            total += value;
+            min = Math.Min(min, value);
+        }
+
+        var mean = total / values.Count;
+        return new ThroughputStatistics(mean, min);
+    }
+}
+
+internal readonly record struct AllocationStatistics(double MaxAllocatedMb)
+{
+    public static AllocationStatistics From(IReadOnlyList<double> values)
+    {
+        var max = 0d;
+        foreach (var value in values)
+        {
+            max = Math.Max(max, value);
+        }
+
+        return new AllocationStatistics(max);
+    }
+}