feat: Add in-memory implementations for issuer audit, key, repository, and trust management

- Introduced InMemoryIssuerAuditSink to retain audit entries for testing.
- Implemented InMemoryIssuerKeyRepository for deterministic key storage.
- Created InMemoryIssuerRepository to manage issuer records in memory.
- Added InMemoryIssuerTrustRepository for managing issuer trust overrides.
- Each repository utilizes concurrent collections for thread-safe operations.
- Enhanced deprecation tracking with a comprehensive YAML schema for API governance.

src/Scanner/StellaOps.Scanner.Analyzers.Native/Reachability/NativeReachabilityGraphBuilder.cs

@@ -114,7 +114,7 @@ internal static class NativeReachabilityGraphBuilder
             .ToImmutableArray();
 
         var distinctEdges = edges
-            .GroupBy(e => (e.From, e.To, e.Reason), ValueTuple.Create)
+            .GroupBy(e => (e.From, e.To, e.Reason))
             .Select(g => g.First())
             .OrderBy(e => e.From, StringComparer.Ordinal)
             .ThenBy(e => e.To, StringComparer.Ordinal)