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.Concelier.Storage.Mongo.Tests/Observations/AdvisoryObservationDocumentFactoryTests.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+using MongoDB.Bson;
+using StellaOps.Concelier.Storage.Mongo.Observations;
+using Xunit;
+
+namespace StellaOps.Concelier.Storage.Mongo.Tests.Observations;
+
+public sealed class AdvisoryObservationDocumentFactoryTests
+{
+    [Fact]
+    public void ToModel_MapsDocumentToModel()
+    {
+        var document = new AdvisoryObservationDocument
+        {
+            Id = "tenant-a:obs-1",
+            Tenant = "tenant-a",
+            CreatedAt = DateTime.SpecifyKind(DateTime.UtcNow, DateTimeKind.Utc),
+            Source = new AdvisoryObservationSourceDocument
+            {
+                Vendor = "vendor",
+                Stream = "stream",
+                Api = "https://api.example"
+            },
+            Upstream = new AdvisoryObservationUpstreamDocument
+            {
+                UpstreamId = "CVE-2025-1234",
+                DocumentVersion = "1",
+                FetchedAt = DateTime.SpecifyKind(DateTime.UtcNow.AddMinutes(-1), DateTimeKind.Utc),
+                ReceivedAt = DateTime.SpecifyKind(DateTime.UtcNow, DateTimeKind.Utc),
+                ContentHash = "sha256:abc",
+                Signature = new AdvisoryObservationSignatureDocument
+                {
+                    Present = true,
+                    Format = "pgp",
+                    KeyId = "key",
+                    Signature = "signature"
+                }
+            },
+            Content = new AdvisoryObservationContentDocument
+            {
+                Format = "CSAF",
+                SpecVersion = "2.0",
+                Raw = BsonDocument.Parse("{\"example\":true}")
+            },
+            Linkset = new AdvisoryObservationLinksetDocument
+            {
+                Aliases = new List<string> { "CVE-2025-1234" },
+                Purls = new List<string> { "pkg:generic/foo@1.0.0" },
+                Cpes = new List<string> { "cpe:/a:vendor:product:1" },
+                References = new List<AdvisoryObservationReferenceDocument>
+                {
+                    new() { Type = "advisory", Url = "https://example.com" }
+                }
+            }
+        };
+
+        var observation = AdvisoryObservationDocumentFactory.ToModel(document);
+
+        Assert.Equal("tenant-a:obs-1", observation.ObservationId);
+        Assert.Equal("tenant-a", observation.Tenant);
+        Assert.Equal("CVE-2025-1234", observation.Upstream.UpstreamId);
+        Assert.Contains("pkg:generic/foo@1.0.0", observation.Linkset.Purls);
+        Assert.Equal("CSAF", observation.Content.Format);
+        Assert.True(observation.Content.Raw?["example"]?.GetValue<bool>());
+        Assert.Equal("advisory", observation.Linkset.References[0].Type);
+    }
+}