stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.HybridLogicalClock.Tests/HlcTimestampTests.Causality.cs

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+// <copyright file="HlcTimestampTests.Causality.cs" company="StellaOps">
+// Copyright (c) StellaOps. Licensed under BUSL-1.1.
+// </copyright>
+using FluentAssertions;
+using Xunit;
+
+namespace StellaOps.HybridLogicalClock.Tests;
+
+public sealed partial class HlcTimestampTests
+{
+    [Fact]
+    public void IsBefore_And_IsAfter_RespectOrdering()
+    {
+        var earlier = CreateTimestamp(1000, "node1", 1);
+        var later = CreateTimestamp(1000, "node1", 2);
+
+        earlier.IsBefore(later).Should().BeTrue();
+        later.IsAfter(earlier).Should().BeTrue();
+    }
+
+    [Fact]
+    public void IsConcurrent_SameTimeCounterDifferentNode_ReturnsTrue()
+    {
+        var a = CreateTimestamp(1000, "node-a", 3);
+        var b = CreateTimestamp(1000, "node-b", 3);
+
+        a.IsConcurrent(b).Should().BeTrue();
+        b.IsConcurrent(a).Should().BeTrue();
+    }
+}