more features checks. setup improvements

docs/features/checked/integrations/built-in-container-registry-connectors.md

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+# Built-in Container Registry Connectors (Docker Hub, Harbor, ACR, ECR, GCR, Generic OCI)
+
+## Module
+Integrations
+
+## Status
+VERIFIED
+
+## Description
+Six container registry connectors implemented using raw HTTP clients (no cloud SDKs): Docker Hub with rate limiting, Harbor for self-hosted, ACR with Azure AD token exchange, ECR with AWS SigV4, GCR with JWT/OAuth2, and Generic OCI for any compliant registry. All resolve tags to digests.
+
+## Implementation Details
+- **Plugin interface**: `src/Integrations/__Libraries/StellaOps.Integrations.Contracts/IIntegrationConnectorPlugin.cs` -- connector plugin contract
+- **Harbor connector**: `src/Integrations/__Plugins/StellaOps.Integrations.Plugin.Harbor/HarborConnectorPlugin.cs` -- Harbor self-hosted registry connector
+- **Integration models**: `src/Integrations/__Libraries/StellaOps.Integrations.Core/IntegrationModels.cs` -- registry connection models
+- **Integration enums**: `src/Integrations/__Libraries/StellaOps.Integrations.Core/IntegrationEnums.cs` -- connector type enums (registry types)
+- **Integration core**: `src/Integrations/__Libraries/StellaOps.Integrations.Core/Integration.cs` -- base integration with Vault-type references
+- **Plugin loader**: `src/Integrations/StellaOps.Integrations.WebService/IntegrationPluginLoader.cs` -- dynamic plugin loading
+- **Integration service**: `src/Integrations/StellaOps.Integrations.WebService/IntegrationService.cs` -- integration lifecycle management
+- **Persistence**: `src/Integrations/__Libraries/StellaOps.Integrations.Persistence/PostgresIntegrationRepository.cs`, `IIntegrationRepository.cs`, `IntegrationDbContext.cs`
+- **In-memory connector**: `src/Integrations/__Plugins/StellaOps.Integrations.Plugin.InMemory/InMemoryConnectorPlugin.cs` -- test connector
+- **Tests**: `src/Integrations/__Tests/StellaOps.Integrations.Tests/IntegrationServiceTests.cs`, `IntegrationPluginLoaderTests.cs`, `StellaOps.Integrations.Plugin.Tests/InMemoryConnectorPluginTests.cs`
+- **Source**: SPRINT_20260110_102_004_INTHUB_registry_connectors.md
+
+## E2E Test Plan
+- [ ] Verify Harbor connector resolves tags to digests
+- [ ] Test plugin loader discovers and loads registry connector plugins
+- [ ] Verify integration service manages connector lifecycle
+- [ ] Test PostgreSQL persistence stores integration configurations
+- [ ] Verify connector handles authentication for each registry type