semi implemented and features implemented save checkpoint

docs/features/unchecked/integrations/toolchain-agnostic-integrations.md

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+# Toolchain-Agnostic Integrations (SCM/CI/Registry)
+
+## Module
+Integrations
+
+## Status
+IMPLEMENTED
+
+## Description
+Plugin-based integration architecture with connector plugins, integration hub UI, and setup wizard is implemented.
+
+## Implementation Details
+- **Plugin contract**: `src/Integrations/__Libraries/StellaOps.Integrations.Contracts/IIntegrationConnectorPlugin.cs` -- toolchain-agnostic connector interface
+- **Plugin loader**: `src/Integrations/StellaOps.Integrations.WebService/IntegrationPluginLoader.cs` -- dynamic plugin loading for SCM/CI/Registry connectors
+- **Built-in plugins**: GitHub App (`StellaOps.Integrations.Plugin.GitHubApp/`), GitLab (`StellaOps.Integrations.Plugin.GitLab/`), Harbor (`StellaOps.Integrations.Plugin.Harbor/`), InMemory (`StellaOps.Integrations.Plugin.InMemory/`)
+- **Integration service**: `src/Integrations/StellaOps.Integrations.WebService/IntegrationService.cs` -- manages plugin lifecycle
+- **Integration endpoints**: `src/Integrations/StellaOps.Integrations.WebService/IntegrationEndpoints.cs` -- REST API for managing integrations
+- **SCM annotations**: `src/Integrations/__Libraries/StellaOps.Integrations.Contracts/ScmAnnotationContracts.cs` -- SCM-agnostic annotation interface
+- **Integration core**: `src/Integrations/__Libraries/StellaOps.Integrations.Core/` -- `Integration.cs`, `IntegrationModels.cs`, `IntegrationEnums.cs`
+- **Persistence**: `src/Integrations/__Libraries/StellaOps.Integrations.Persistence/PostgresIntegrationRepository.cs`
+- **Frontend**: Integration hub wizard UI and detail views in `src/Web/`
+- **Tests**: `src/Integrations/__Tests/StellaOps.Integrations.Tests/IntegrationServiceTests.cs`, `IntegrationPluginLoaderTests.cs`, `StellaOps.Integrations.Plugin.Tests/InMemoryConnectorPluginTests.cs`
+- **Source**: Feature matrix scan
+
+## E2E Test Plan
+- [ ] Verify plugin loader discovers connectors for SCM, CI, and Registry types
+- [ ] Test GitHub App and GitLab connectors through unified interface
+- [ ] Verify Harbor and InMemory registry connectors work interchangeably
+- [ ] Test integration management API handles all connector types
+- [ ] Verify toolchain-agnostic contract allows adding new connector plugins