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/policy/architecture.md

@@ -112,7 +112,7 @@ Key notes:
 | **DSL Compiler** (`Dsl/`) | Parse, canonicalise, IR generation, checksum caching. | Uses Roslyn-like pipeline; caches by `policyId+version+hash`. |
 | **Selection Layer** (`Selection/`) | Batch SBOM ↔ advisory ↔ VEX joiners; apply equivalence tables; support incremental cursors. | Deterministic ordering (SBOM → advisory → VEX). |
 | **Evaluator** (`Evaluation/`) | Execute IR with first-match semantics, compute severity/trust/reachability weights, record rule hits. | Stateless; all inputs provided by selection layer. |
-| **Signals** (`Signals/`) | Normalizes reachability, trust, entropy, uncertainty, runtime hits into a single dictionary passed to Evaluator; supplies default `unknown` values when signals missing. | Aligns with `signals.*` namespace in DSL. |
+| **Signals** (`Signals/`) | Normalizes reachability, trust, entropy, uncertainty, runtime hits into a single dictionary passed to Evaluator; supplies default `unknown` values when signals missing. Entropy penalties are derived from Scanner `layer_summary.json`/`entropy.report.json` (K=0.5, cap=0.3, block at image opaque ratio > 0.15 w/ unknown provenance) and exported via `policy_entropy_penalty_value` / `policy_entropy_image_opaque_ratio`. | Aligns with `signals.*` namespace in DSL. |
 | **Materialiser** (`Materialization/`) | Upsert effective findings, append history, manage explain bundle exports. | Mongo transactions per SBOM chunk. |
 | **Orchestrator** (`Runs/`) | Change-stream ingestion, fairness, retry/backoff, queue writer. | Works with Scheduler Models DTOs. |
 | **API** (`Api/`) | Minimal API endpoints, DTO validation, problem responses, idempotency. | Generated clients for CLI/UI. |