update evidence bundle to include new evidence types and implement ProofSpine integration

src/__Libraries/StellaOps.Evidence.Bundle/GraphRevisionEvidence.cs

@@ -0,0 +1,14 @@
+namespace StellaOps.Evidence.Bundle;
+
+/// <summary>Graph revision and verdict receipt evidence.</summary>
+public sealed class GraphRevisionEvidence
+{
+    public required EvidenceStatus Status { get; init; }
+    public string? Hash { get; init; }
+    public required string GraphRevisionId { get; init; }
+    public string? VerdictReceipt { get; init; }
+    public DateTimeOffset? GraphComputedAt { get; init; }
+    public int? TotalNodes { get; init; }
+    public int? TotalEdges { get; init; }
+    public string? UnavailableReason { get; init; }
+}