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/PolicyEngine/StellaOps.Bench.PolicyEngine/PathUtilities.cs

@@ -0,0 +1,15 @@
+namespace StellaOps.Bench.PolicyEngine;
+
+internal static class PathUtilities
+{
+    public static bool IsWithinRoot(string root, string candidate)
+    {
+        var relative = Path.GetRelativePath(root, candidate);
+        if (string.IsNullOrEmpty(relative) || relative == ".")
+        {
+            return true;
+        }
+
+        return !relative.StartsWith("..", StringComparison.Ordinal) && !Path.IsPathRooted(relative);
+    }
+}