Restructure solution layout by module

src/Concelier/__Libraries/StellaOps.Concelier.Merge/Services/MergeConflictSummary.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Immutable;
+
+namespace StellaOps.Concelier.Merge.Services;
+
+/// <summary>
+/// Summary of a persisted advisory conflict including hashes and structured explainer payload.
+/// </summary>
+public sealed record MergeConflictSummary(
+    Guid ConflictId,
+    string VulnerabilityKey,
+    ImmutableArray<Guid> StatementIds,
+    string ConflictHash,
+    DateTimeOffset AsOf,
+    DateTimeOffset RecordedAt,
+    MergeConflictExplainerPayload Explainer);