feat: Add VEX compact fixture and implement offline verifier for Findings Ledger exports

- Introduced a new VEX compact fixture for testing purposes.
- Implemented `verify_export.py` script to validate Findings Ledger exports, ensuring deterministic ordering and applying redaction manifests.
- Added a lightweight stub `HarnessRunner` for unit tests to validate ledger hashing expectations.
- Documented tasks related to the Mirror Creator.
- Created models for entropy signals and implemented the `EntropyPenaltyCalculator` to compute penalties based on scanner outputs.
- Developed unit tests for `EntropyPenaltyCalculator` to ensure correct penalty calculations and handling of edge cases.
- Added tests for symbol ID normalization in the reachability scanner.
- Enhanced console status service with comprehensive unit tests for connection handling and error recovery.
- Included Cosign tool version 2.6.0 with checksums for various platforms.

src/Scanner/__Tests/StellaOps.Scanner.Reachability.Tests/RichGraphWriterTests.cs

@@ -16,8 +16,8 @@ public class RichGraphWriterTests
         var union = new ReachabilityUnionGraph(
             Nodes: new[]
             {
-                new ReachabilityUnionNode("sym:dotnet:B", "dotnet", "method", display: "B"),
-                new ReachabilityUnionNode("sym:dotnet:A", "dotnet", "method", display: "A")
+                new ReachabilityUnionNode("sym:dotnet:B", "dotnet", "method", "B"),
+                new ReachabilityUnionNode("sym:dotnet:A", "dotnet", "method", "A")
             },
             Edges: new[]
             {