Initial design document for the Material 3 Expressive calendar app.
Covers scope (V1 read-only MVP, variant "B"), tech stack (Kotlin +
Compose + Material3 Expressive, minSdk 29), architecture, data flow
over CalendarContract, screens/menus, the mandatory Loading/Failure/
Success state pattern per screen, error handling, i18n, accessibility,
testing approach, and CI/CD adaptation from HouseHoldKeaper.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
