semi implemented and features implemented save checkpoint

docs/features/unchecked/integrations/github-app-connector.md

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+# GitHub App Connector
+
+## Module
+Integrations
+
+## Status
+IMPLEMENTED
+
+## Description
+GitHub App connector with authentication, health checks, annotation support, and Code Scanning extensions is fully implemented.
+
+## Implementation Details
+- **Connector plugin**: `src/Integrations/__Plugins/StellaOps.Integrations.Plugin.GitHubApp/GitHubAppConnectorPlugin.cs` -- GitHub App connector with authentication and health checks
+- **Annotation client**: `src/Integrations/__Plugins/StellaOps.Integrations.Plugin.GitHubApp/GitHubAppAnnotationClient.cs` -- PR annotations via GitHub App
+- **Code scanning client**: `src/Integrations/__Plugins/StellaOps.Integrations.Plugin.GitHubApp/CodeScanning/GitHubCodeScanningClient.cs`, `IGitHubCodeScanningClient.cs` -- GitHub Code Scanning API
+- **Code scanning extensions**: `src/Integrations/__Plugins/StellaOps.Integrations.Plugin.GitHubApp/CodeScanning/GitHubCodeScanningExtensions.cs` -- DI registration
+- **Alert filter**: `src/Integrations/__Plugins/StellaOps.Integrations.Plugin.GitHubApp/CodeScanning/AlertFilter.cs` -- code scanning alert filtering
+- **SARIF upload**: `src/Integrations/__Plugins/StellaOps.Integrations.Plugin.GitHubApp/CodeScanning/SarifUploadRequest.cs`, `SarifUploadResult.cs`, `SarifUploadStatus.cs` -- SARIF upload models
+- **Processing status**: `src/Integrations/__Plugins/StellaOps.Integrations.Plugin.GitHubApp/CodeScanning/ProcessingStatus.cs`
+- **Code scanning alert model**: `src/Integrations/__Plugins/StellaOps.Integrations.Plugin.GitHubApp/CodeScanning/CodeScanningAlert.cs`
+- **Tests**: `src/Integrations/__Tests/StellaOps.Integrations.Tests/CodeScanning/GitHubCodeScanningClientTests.cs`
+- **Source**: Feature matrix scan
+
+## E2E Test Plan
+- [ ] Verify GitHub App authenticates using app installation tokens
+- [ ] Test PR annotation creates check runs with finding summaries
+- [ ] Verify Code Scanning API uploads SARIF results
+- [ ] Test alert filtering by severity and rule
+- [ ] Verify health check validates GitHub App connectivity