semi implemented and features implemented save checkpoint

docs/features/unchecked/excititor/vex-source-registration-and-verification-pipeline.md

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+# VEX Source Registration and Verification Pipeline
+
+## Module
+Excititor
+
+## Status
+IMPLEMENTED
+
+## Description
+VEX source onboarding pipeline with scheduled provider runners, orchestration, signature verification, and issuer directory integration for multi-vendor VEX ingestion.
+
+## Implementation Details
+- **Modules**: `src/Excititor/StellaOps.Excititor.Worker/`, `src/Excititor/__Libraries/StellaOps.Excititor.Connectors.Abstractions/`
+- **Key Classes**:
+  - `VexWorkerHostedService` (`src/Excititor/StellaOps.Excititor.Worker/Scheduling/VexWorkerHostedService.cs`) - background service scheduling provider runs
+  - `DefaultVexProviderRunner` (`src/Excititor/StellaOps.Excititor.Worker/Scheduling/DefaultVexProviderRunner.cs`) - runs VEX provider connectors on schedule
+  - `OrchestratorVexProviderRunner` (`src/Excititor/StellaOps.Excititor.Worker/Orchestration/OrchestratorVexProviderRunner.cs`) - orchestrator-managed provider runner
+  - `VexWorkerOrchestratorClient` (`src/Excititor/StellaOps.Excititor.Worker/Orchestration/VexWorkerOrchestratorClient.cs`) - communicates with orchestrator for work assignment
+  - `VexWorkerHeartbeatService` (`src/Excititor/StellaOps.Excititor.Worker/Orchestration/VexWorkerHeartbeatService.cs`) - sends heartbeats to orchestrator
+  - `VexWorkerPluginCatalogLoader` (`src/Excititor/StellaOps.Excititor.Worker/Plugins/VexWorkerPluginCatalogLoader.cs`) - loads available VEX connector plugins
+  - `VexConnectorBase` (`src/Excititor/__Libraries/StellaOps.Excititor.Connectors.Abstractions/VexConnectorBase.cs`) - base class for VEX source connectors
+  - `VexConnectorDescriptor` (`src/Excititor/__Libraries/StellaOps.Excititor.Connectors.Abstractions/VexConnectorDescriptor.cs`) - descriptor metadata for connectors
+  - `WorkerSignatureVerifier` (`src/Excititor/StellaOps.Excititor.Worker/Signature/WorkerSignatureVerifier.cs`) - verifies signatures during ingestion
+  - `VexWorkerSchedule` (`src/Excititor/StellaOps.Excititor.Worker/Scheduling/VexWorkerSchedule.cs`) - schedule configuration for provider runs
+  - `MirrorRegistrationEndpoints` (`src/Excititor/StellaOps.Excititor.WebService/Endpoints/MirrorRegistrationEndpoints.cs`) - REST endpoints for mirror/source registration
+- **Interfaces**: `IVexProviderRunner`, `IVexConsensusRefreshScheduler`, `IVexWorkerOrchestratorClient`
+- **Source**: Feature matrix scan
+
+## E2E Test Plan
+- [ ] Register a new VEX source via `MirrorRegistrationEndpoints` and verify it appears in the plugin catalog
+- [ ] Verify `VexWorkerHostedService` schedules provider runs based on `VexWorkerSchedule` configuration
+- [ ] Verify `DefaultVexProviderRunner` executes the connector and ingests VEX documents
+- [ ] Verify `WorkerSignatureVerifier` validates signatures on ingested documents during the pipeline
+- [ ] Verify `VexWorkerHeartbeatService` sends heartbeats to the orchestrator during long-running ingestion
+- [ ] Verify `VexWorkerPluginCatalogLoader` discovers and loads all available vendor connectors (Ubuntu, Red Hat, Oracle, Microsoft, Cisco, SUSE)