Add determinism tests for verdict artifact generation and update SHA256 sums script

- Implemented comprehensive tests for verdict artifact generation to ensure deterministic outputs across various scenarios, including identical inputs, parallel execution, and change ordering.
- Created helper methods for generating sample verdict inputs and computing canonical hashes.
- Added tests to validate the stability of canonical hashes, proof spine ordering, and summary statistics.
- Introduced a new PowerShell script to update SHA256 sums for files, ensuring accurate hash generation and file integrity checks.

docs/airgap/advisory-implementation-roadmap.md

@@ -296,7 +296,7 @@ src/Authority/
 
 | Document | Sprint | Updates |
 |----------|--------|---------|
-| `docs/airgap/importer-scaffold.md` | 0338 | Add monotonicity, quarantine sections |
+| `docs/airgap/importer.md` | 0338 | Monotonicity + quarantine reference |
 | `docs/airgap/runbooks/quarantine-investigation.md` | 0338 | New runbook |
 | `docs/modules/cli/commands/offline.md` | 0339 | New command reference |
 | `docs/modules/cli/guides/airgap.md` | 0339 | Update with CLI examples |
@@ -336,4 +336,4 @@ src/Authority/
 - [14-Dec-2025 Offline and Air-Gap Technical Reference](../product-advisories/14-Dec-2025%20-%20Offline%20and%20Air-Gap%20Technical%20Reference.md)
 - [Air-Gap Mode Playbook](./airgap-mode.md)
 - [Offline Kit Documentation](../24_OFFLINE_KIT.md)
-- [Importer Scaffold](./importer-scaffold.md)
+- [Importer](./importer.md)