feat(extension): add VS Code extension with kanban board interface

- Complete VS Code extension with React-based kanban board UI
- MCP integration for real-time Task Master synchronization
- Professional CI/CD workflows for marketplace publishing
- Comprehensive configuration system with user preferences
- ShadCN UI components with VS Code theme integration
- Drag-and-drop task management with status transitions
- AI-powered task features via MCP protocol
- Robust error handling and connection management
- Multi-registry publishing (VS Code Marketplace + Open VSX)
- Security audit completed with hardcoded paths removed

BREAKING CHANGE: Extension requires publisher setup and marketplace keys

Publisher and extension naming decisions required:
- Update publisher field from placeholder 'DavidMaliglowka'
- Choose unique extension name (currently 'taskr-kanban')
- Select appropriate extension icon
- Configure CI secrets (VSCE_PAT, OVSX_PAT) for publishing

See apps/extension/docs/ for detailed setup instructions

apps/extension/.vscodeignore

@@ -0,0 +1,25 @@
+# Ignore everything by default
+*
+
+# Only include specific essential files
+!package.json
+!README.md
+!CHANGELOG.md
+!LICENSE
+!icon.png
+!assets/**
+
+# Include only the built files we need (not source maps)
+!dist/extension.js
+!dist/index.js
+!dist/index.css
+
+# Exclude development documentation
+docs/extension-CI-setup.md
+docs/extension-DEV-guide.md
+
+# Exclude 
+assets/.DS_Store
+assets/banner.png
+
+