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.Aoc/AocGuardExtensions.cs

@@ -0,0 +1,22 @@
+using System.Text.Json;
+
+namespace StellaOps.Aoc;
+
+public static class AocGuardExtensions
+{
+    public static AocGuardResult ValidateOrThrow(this IAocGuard guard, JsonElement document, AocGuardOptions? options = null)
+    {
+        if (guard is null)
+        {
+            throw new ArgumentNullException(nameof(guard));
+        }
+
+        var result = guard.Validate(document, options);
+        if (!result.IsValid)
+        {
+            throw new AocGuardException(result);
+        }
+
+        return result;
+    }
+}