feature-flags-authoring

Add, edit, or remove a Packmind feature flag across the shared registry, the frontend gate, and the backend helper. Use when the user wants to create a new feature flag, gate a feature behind a flag, open or restrict a flag to a domain/email, change a flag audience, retire or delete a flag, or asks how the feature-flag system is wired. This is the developer how-to counterpart to the feature-flags-audit skill.