Introduce VSCode configuration and integrate roo-cline extension. This includes adding roo-cline to vscode extensions and setting up metadata for its marketplace details.
- Added `goose-cli` package definition and metadata in `unstable` overlay.
- Updated `default.nix` under `aarch64-darwin` to include `goose-cli` in system packages.
- Removed commented out packages and cleaned up unused lines for better clarity and maintainability.
Harald Hoyer