Read documented Graph v1 calendarView pages for secondary calendars and publish each finite window only after the complete bounded listing validates.
Add schema-v2 per-window event membership so moved-out occurrences are evicted without being mislabeled as remote tombstones, while overlapping windows retain shared instances.
Verified: 18/18 fresh normal, 18/18 -Werror, and 18/18 ASan/UBSan tests.
Add a private provider-neutral SQLite WAL cache with transactional migrations, retained raw payloads and tombstones, per-window opaque checkpoints, and reserved outbox/conflict tables.
Verify migrations, permissions, identity invariants, concurrent access, atomic pull-page rollback, and future-schema rejection with deterministic tests. No OAuth, networking, secrets, or Graph synchronization is included yet.
