Restructure solution layout by module

src/Concelier/__Libraries/StellaOps.Concelier.Merge/Identity/AliasIdentity.cs

@@ -0,0 +1,24 @@
+using System;
+
+namespace StellaOps.Concelier.Merge.Identity;
+
+/// <summary>
+/// Normalized alias representation used within identity clusters.
+/// </summary>
+public sealed class AliasIdentity
+{
+    public AliasIdentity(string value, string? scheme)
+    {
+        if (string.IsNullOrWhiteSpace(value))
+        {
+            throw new ArgumentException("Alias value must be provided.", nameof(value));
+        }
+
+        Value = value.Trim();
+        Scheme = string.IsNullOrWhiteSpace(scheme) ? null : scheme.Trim();
+    }
+
+    public string Value { get; }
+
+    public string? Scheme { get; }
+}