stabilizaiton work - projects rework for maintenanceability and ui livening

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

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+// <copyright file="HlcTimestampTests.Mutation.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 Increment_IncreasesLogicalCounter()
+    {
+        var original = CreateTimestamp(1000, "node1", 4);
+
+        var incremented = original.Increment();
+
+        incremented.PhysicalTime.Should().Be(original.PhysicalTime);
+        incremented.NodeId.Should().Be(original.NodeId);
+        incremented.LogicalCounter.Should().Be(5);
+    }
+
+    [Fact]
+    public void WithPhysicalTime_ResetsCounter()
+    {
+        var original = CreateTimestamp(1000, "node1", 4);
+
+        var updated = original.WithPhysicalTime(2000);
+
+        updated.PhysicalTime.Should().Be(2000);
+        updated.NodeId.Should().Be("node1");
+        updated.LogicalCounter.Should().Be(0);
+    }
+}