feat: Implement vulnerability token signing and verification utilities

- Added VulnTokenSigner for signing JWT tokens with specified algorithms and keys.
- Introduced VulnTokenUtilities for resolving tenant and subject claims, and sanitizing context dictionaries.
- Created VulnTokenVerificationUtilities for parsing tokens, verifying signatures, and deserializing payloads.
- Developed VulnWorkflowAntiForgeryTokenIssuer for issuing anti-forgery tokens with configurable options.
- Implemented VulnWorkflowAntiForgeryTokenVerifier for verifying anti-forgery tokens and validating payloads.
- Added AuthorityVulnerabilityExplorerOptions to manage configuration for vulnerability explorer features.
- Included tests for FilesystemPackRunDispatcher to ensure proper job handling under egress policy restrictions.

docs/notifications/overview.md

@@ -48,6 +48,7 @@ The Notify WebService fronts worker state with REST APIs used by the UI and CLI.
 | **Scaling** | Workers scale horizontally; per-tenant rule snapshots are cached and refreshed from Mongo change streams. Redis (or equivalent) guards throttles and locks. |
 | **Offline** | Offline Kits include plug-ins, default templates, and seed rules. Operators can edit YAML/JSON manifests before air-gapped deployment. |
 | **Security** | Channel secrets use indirection (`secretRef`), Authority-protected OAuth clients secure API access, and delivery payloads are redacted before storage where required. |
+| **Module boundaries** | 2025-11-02 decision: keep `src/Notify/` as the shared notification toolkit and `src/Notifier/` as the Notifications Studio runtime host until a packaging RFC covers the implications of merging. |
 
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