Initial commit (history squashed)

src/StellaOps.Feedser.Core/CanonicalMergeResult.cs

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+using System.Collections.Immutable;
+using StellaOps.Feedser.Models;
+
+namespace StellaOps.Feedser.Core;
+
+/// <summary>
+/// Result emitted by <see cref="CanonicalMerger"/> describing the merged advisory and analytics about key decisions.
+/// </summary>
+public sealed record CanonicalMergeResult(Advisory Advisory, ImmutableArray<FieldDecision> Decisions);
+
+/// <summary>
+/// Describes how a particular canonical field was chosen during conflict resolution.
+/// </summary>
+public sealed record FieldDecision(
+    string Field,
+    string? SelectedSource,
+    string DecisionReason,
+    DateTimeOffset? SelectedModified,
+    ImmutableArray<string> ConsideredSources);