5 new packages: clipboard, dialog, notification, environment, screen.
Each follows the three-layer pattern with Platform interface, IPC
messages, and Service. Task 7 cleans up display orchestrator.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Wire go-config into display orchestrator to replace the in-memory
loadConfig() stub with real .core/gui/config.yaml file loading and
persistence via handleConfigTask.
Co-Authored-By: Virgil <virgil@lethean.io>