Add sample proof bundle configurations and verification script

- Introduced sample proof bundle configuration files for testing, including `sample-proof-bundle-config.dsse.json`, `sample-proof-bundle.dsse.json`, and `sample-proof-bundle.json`.
- Implemented a verification script `test_verify_sample.sh` to validate proof bundles against specified schemas and catalogs.
- Updated existing proof bundle configurations with new metadata, including versioning, created timestamps, and justification details.
- Enhanced evidence entries with expiration dates and hashes for better integrity checks.
- Ensured all new configurations adhere to the defined schema for consistency and reliability in testing.

src/Policy/__Tests/StellaOps.Policy.Engine.Tests/Console/ConsoleSimulationDiffServiceTests.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Text.Json;
 using StellaOps.Policy.Engine.ConsoleSurface;
 using StellaOps.Policy.Engine.Simulation;
 using Xunit;
@@ -28,7 +29,10 @@ public sealed class ConsoleSimulationDiffServiceTests
         var first = service.Compute(request);
         var second = service.Compute(request);
 
-        Assert.Equal(first, second); // deterministic
+        // Determinism: same serialized payload across repeated calls.
+        var serializedFirst = JsonSerializer.Serialize(first);
+        var serializedSecond = JsonSerializer.Serialize(second);
+        Assert.Equal(serializedFirst, serializedSecond);
         Assert.Equal("console-policy-23-001", first.SchemaVersion);
         Assert.True(first.Summary.After.Total > 0);
         Assert.True(first.Summary.Before.Total > 0);