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.

tools/PolicyDslValidator/Program.cs

@@ -0,0 +1,56 @@
+using StellaOps.Policy;
+
+if (args.Length == 0)
+{
+    Console.Error.WriteLine("Usage: policy-dsl-validator [--strict] [--json] <path-or-glob> [<path-or-glob> ...]");
+    Console.Error.WriteLine("Example: policy-dsl-validator --strict docs/examples/policies");
+    return 64; // EX_USAGE
+}
+
+var inputs = new List<string>();
+var strict = false;
+var outputJson = false;
+
+foreach (var arg in args)
+{
+    switch (arg)
+    {
+        case "--strict":
+        case "-s":
+            strict = true;
+            break;
+
+        case "--json":
+        case "-j":
+            outputJson = true;
+            break;
+
+        case "--help":
+        case "-h":
+        case "-?":
+            Console.WriteLine("Usage: policy-dsl-validator [--strict] [--json] <path-or-glob> [<path-or-glob> ...]");
+            Console.WriteLine("Example: policy-dsl-validator --strict docs/examples/policies");
+            return 0;
+
+        default:
+            inputs.Add(arg);
+            break;
+    }
+}
+
+if (inputs.Count == 0)
+{
+    Console.Error.WriteLine("No input files or directories provided.");
+    return 64; // EX_USAGE
+}
+
+var options = new PolicyValidationCliOptions
+{
+    Inputs = inputs,
+    Strict = strict,
+    OutputJson = outputJson,
+};
+
+var cli = new PolicyValidationCli();
+var exitCode = await cli.RunAsync(options, CancellationToken.None);
+return exitCode;