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.Engine/Scoring/RiskScoringTriggerService.cs

@@ -1,7 +1,7 @@
 using System.Collections.Concurrent;
-using System.Security.Cryptography;
 using System.Text;
 using Microsoft.Extensions.Logging;
+using StellaOps.Cryptography;
 using StellaOps.Policy.Engine.Services;
 using StellaOps.Policy.Engine.Telemetry;
 using StellaOps.Policy.RiskProfile.Hashing;
@@ -18,6 +18,7 @@ public sealed class RiskScoringTriggerService
     private readonly RiskProfileConfigurationService _profileService;
     private readonly IRiskScoringJobStore _jobStore;
     private readonly RiskProfileHasher _hasher;
+    private readonly ICryptoHash _cryptoHash;
     private readonly ConcurrentDictionary<string, DateTimeOffset> _recentTriggers;
     private readonly TimeSpan _deduplicationWindow;
 
@@ -25,13 +26,15 @@ public sealed class RiskScoringTriggerService
         ILogger<RiskScoringTriggerService> logger,
         TimeProvider timeProvider,
         RiskProfileConfigurationService profileService,
-        IRiskScoringJobStore jobStore)
+        IRiskScoringJobStore jobStore,
+        ICryptoHash cryptoHash)
     {
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         _timeProvider = timeProvider ?? throw new ArgumentNullException(nameof(timeProvider));
         _profileService = profileService ?? throw new ArgumentNullException(nameof(profileService));
         _jobStore = jobStore ?? throw new ArgumentNullException(nameof(jobStore));
-        _hasher = new RiskProfileHasher();
+        _cryptoHash = cryptoHash ?? throw new ArgumentNullException(nameof(cryptoHash));
+        _hasher = new RiskProfileHasher(cryptoHash);
         _recentTriggers = new ConcurrentDictionary<string, DateTimeOffset>();
         _deduplicationWindow = TimeSpan.FromMinutes(5);
     }
@@ -256,10 +259,10 @@ public sealed class RiskScoringTriggerService
         }
     }
 
-    private static string GenerateJobId(string tenantId, string contextId, DateTimeOffset timestamp)
+    private string GenerateJobId(string tenantId, string contextId, DateTimeOffset timestamp)
     {
         var seed = $"{tenantId}|{contextId}|{timestamp:O}|{Guid.NewGuid()}";
-        var hash = SHA256.HashData(Encoding.UTF8.GetBytes(seed));
-        return $"rsj-{Convert.ToHexStringLower(hash)[..16]}";
+        var hash = _cryptoHash.ComputeHashHexForPurpose(Encoding.UTF8.GetBytes(seed), HashPurpose.Content);
+        return $"rsj-{hash[..16]}";
     }
 }