Add unit tests for RabbitMq and Udp transport servers and clients

- Implemented comprehensive unit tests for RabbitMqTransportServer, covering constructor, disposal, connection management, event handlers, and exception handling.
- Added configuration tests for RabbitMqTransportServer to validate SSL, durable queues, auto-recovery, and custom virtual host options.
- Created unit tests for UdpFrameProtocol, including frame parsing and serialization, header size validation, and round-trip data preservation.
- Developed tests for UdpTransportClient, focusing on connection handling, event subscriptions, and exception scenarios.
- Established tests for UdpTransportServer, ensuring proper start/stop behavior, connection state management, and event handling.
- Included tests for UdpTransportOptions to verify default values and modification capabilities.
- Enhanced service registration tests for Udp transport services in the dependency injection container.

src/Policy/StellaOps.Policy.RiskProfile/Hashing/RiskProfileHasher.cs

@@ -1,7 +1,7 @@
-using System.Security.Cryptography;
 using System.Text;
 using System.Text.Json;
 using System.Text.Json.Serialization;
+using StellaOps.Cryptography;
 using StellaOps.Policy.RiskProfile.Models;
 
 namespace StellaOps.Policy.RiskProfile.Hashing;
@@ -11,6 +11,8 @@ namespace StellaOps.Policy.RiskProfile.Hashing;
 /// </summary>
 public sealed class RiskProfileHasher
 {
+    private readonly ICryptoHash _cryptoHash;
+
     private static readonly JsonSerializerOptions CanonicalJsonOptions = new()
     {
         WriteIndented = false,
@@ -22,20 +24,24 @@ public sealed class RiskProfileHasher
         },
     };
 
+    public RiskProfileHasher(ICryptoHash cryptoHash)
+    {
+        _cryptoHash = cryptoHash ?? throw new ArgumentNullException(nameof(cryptoHash));
+    }
+
     /// <summary>
-    /// Computes a deterministic SHA-256 hash of the risk profile.
+    /// Computes a deterministic hash of the risk profile using the compliance profile's content algorithm.
     /// </summary>
     /// <param name="profile">The profile to hash.</param>
-    /// <returns>Lowercase hex-encoded SHA-256 hash.</returns>
+    /// <returns>Lowercase hex-encoded hash.</returns>
     public string ComputeHash(RiskProfileModel profile)
     {
         ArgumentNullException.ThrowIfNull(profile);
 
         var canonical = CreateCanonicalForm(profile);
         var json = JsonSerializer.Serialize(canonical, CanonicalJsonOptions);
-        var hash = SHA256.HashData(Encoding.UTF8.GetBytes(json));
 
-        return Convert.ToHexStringLower(hash);
+        return _cryptoHash.ComputeHashHexForPurpose(Encoding.UTF8.GetBytes(json), HashPurpose.Content);
     }
 
     /// <summary>
@@ -43,16 +49,15 @@ public sealed class RiskProfileHasher
     /// Useful for detecting semantic changes regardless of versioning.
     /// </summary>
     /// <param name="profile">The profile to hash.</param>
-    /// <returns>Lowercase hex-encoded SHA-256 hash.</returns>
+    /// <returns>Lowercase hex-encoded hash.</returns>
     public string ComputeContentHash(RiskProfileModel profile)
     {
         ArgumentNullException.ThrowIfNull(profile);
 
         var canonical = CreateCanonicalContentForm(profile);
         var json = JsonSerializer.Serialize(canonical, CanonicalJsonOptions);
-        var hash = SHA256.HashData(Encoding.UTF8.GetBytes(json));
 
-        return Convert.ToHexStringLower(hash);
+        return _cryptoHash.ComputeHashHexForPurpose(Encoding.UTF8.GetBytes(json), HashPurpose.Content);
     }
 
     /// <summary>