Add tests and implement StubBearer authentication for Signer endpoints

- Created SignerEndpointsTests to validate the SignDsse and VerifyReferrers endpoints.
- Implemented StubBearerAuthenticationDefaults and StubBearerAuthenticationHandler for token-based authentication.
- Developed ConcelierExporterClient for managing Trivy DB settings and export operations.
- Added TrivyDbSettingsPageComponent for UI interactions with Trivy DB settings, including form handling and export triggering.
- Implemented styles and HTML structure for Trivy DB settings page.
- Created NotifySmokeCheck tool for validating Redis event streams and Notify deliveries.

docs/12_PERFORMANCE_WORKBOOK.md

@@ -55,10 +55,11 @@
 
 ## 3 Test Harness
 
-* **Runner** – `perf/run.sh`, accepts `--phase` and `--samples`.  
-* **Metrics** – Prometheus + `jq` extracts; aggregated via `scripts/aggregate.ts`.  
-* **CI** – GitLab CI job *benchmark* publishes JSON to `bench‑artifacts/`.  
-* **Visualisation** – Grafana dashboard *Stella‑Perf* (provisioned JSON).  
+* **Runner** – `perf/run.sh`, accepts `--phase` and `--samples`.  
+* **Language analyzers microbench** – `dotnet run --project bench/Scanner.Analyzers/StellaOps.Bench.ScannerAnalyzers/StellaOps.Bench.ScannerAnalyzers.csproj -- --repo-root . --out bench/Scanner.Analyzers/baseline.csv` produces deterministic CSVs for analyzer scenarios (Node today, others as they land).  
+* **Metrics** – Prometheus + `jq` extracts; aggregated via `scripts/aggregate.ts`.  
+* **CI** – GitLab CI job *benchmark* publishes JSON to `bench‑artifacts/`.  
+* **Visualisation** – Grafana dashboard *Stella‑Perf* (provisioned JSON).  
 
 > **Note** – harness mounts `/var/cache/trivy` tmpfs to avoid disk noise.