Starter

A screensaver: a .saver bundle whose ScreenSaverView subclass draws from a tested Core. Made with Summon from its screensaver template.

Layout

Path	What it is
Sources/Starter/	The ScreenSaverView subclass (StarterView): drawing and lifecycle only
Sources/StarterCore/	The animation, Foundation only, tested (SummonThemeFile reads the Summon theme)
Resources/	Info.plist: The .saver bundle's plist: NSPrincipalClass StarterView, bundle id local.summon.screensaver-starter; AppIcon.icns (a placeholder: replace it with the summon-art skill)
Tests/StarterCoreTests/	swift-testing
scripts/check.sh	The gate: build, tests (scripts/test.sh, which also works without Xcode), and the rest; writes build/check-report.md

Build and run

scripts/check.sh
scripts/bundle.sh            # build/Starter.saver
scripts/install.sh           # copies it to ~/Library/Screen Savers; pick it in System Settings › Screen Saver

Requires macOS 15+ and Swift 6. No third-party dependencies.