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.

docs/modules/concelier/link-not-merge-schema.md

@@ -9,6 +9,7 @@ _Frozen v1 (add-only) — approved 2025-11-17 for CONCELIER-LNM-21-001/002/101._
 
 ## Status
 - Frozen v1 as of 2025-11-17; further schema changes must go through ADR + sprint gating (CONCELIER-LNM-22x+).
+- Canonical JSON Schemas + signed manifest live in `docs/modules/concelier/schemas/` (advisory observation, linkset, offline bundle). Verify with `openssl dgst -sha256 -verify schema-signing-pub.pem -signature schema.manifest.sig schema.manifest.json`.
 
 ## Observation document (Mongo JSON Schema excerpt)
 ```json