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/benchmarks/scanner/deep-dives/os-packages.md

@@ -29,6 +29,14 @@
 - **Metadata depth**: StellaOps records extensive vendor metadata and file evidence for replay; Trivy, Snyk, and Grype focus on match-relevant fields from their feeds.
 - **Provenance**: StellaOps’ outputs integrate directly with attestation/diff pipelines, while Trivy, Snyk, and Grype assume downstream tools consume package lists without replay requirements.
 
+### Detection technique comparison
+| Tool | Detection technique(s) | Merge / result handling | Notes |
+| --- | --- | --- | --- |
+| **StellaOps** | Deterministic DB parsing via `StellaOps.Scanner.Analyzers.OS.(Apk|Dpkg|Rpm)`; fragment mapping via `OsComponentMapper`; provenance persisted in Surface.FS. | Analyzer outputs become `LayerComponentFragment`s stored in `ScanAnalysisStore`; SBOM assembly composes inventory/usage views while preserving layer digests and metadata for diffs + attestations. | Supports offline replay, DSSE binding, and policy joins with Concelier advisories. |
+| **Trivy** | Layer walkers + distro parsers in `pkg/fanal/analyzer/pkg/*`; optional manifest enrichment using vendor feeds. | Packages aggregated per artifact; provenance/layer context not persisted, leaving downstream tooling to interpret results. | Coverage matrix enumerated in `docs/docs/coverage/os/*.md`. |
+| **Grype** | Syft catalogers + matchers in `grype/matcher/{apk,dpkg,rpm}` leveraging Anchore feeds. | Matchers run against Syft inventory and Anchore DB; no layer fragments retained. | Determinism depends on feed snapshots. |
+| **Snyk** | Container scans upload image metadata to SaaS for analysis. | Results surfaced via SaaS dashboards/API; no local merge or provenance data. | Requires network connectivity; offline unsupported. |
+
 ### References
 - [t1] `/tmp/trivy-src/docs/docs/coverage/os/index.md`
 - [s1] `/tmp/snyk-cli/README.md`