Initial release.

• HiveCacheStorage — CacheStorage backed by a Hive Box.
• SqliteCacheStorage — CacheStorage backed by sqlite3 (pure-Dart FFI, no platform channels).
• InMemoryCacheStorage — non-persistent reference implementation, used in this package's own tests.
• initializePersistentCache — schema-version check on startup; wipes storage on a version mismatch instead of risking a crash deserializing incompatible data.
• hydrateQuery<T> — reads + decodes a persisted entry straight into a QueryClient's in-memory cache via setQueryData; drops (rather than crashes on) a corrupt individual entry.
• persistedFetcher<T> — wraps any fetcher for write-through persistence; a failing disk write never surfaces as a query failure.
• Test suite (plain dart test): full CRUD + version behavior for all three CacheStorage implementations (Hive via hive_test's in-memory setup, sqlite3 via sqlite3.openInMemory()), hydration success/empty/ corrupt-entry paths, version-mismatch wiping, and write-through composed with a real QueryClient query.

Not included yet #

• Isar adapter — Isar's code-generation step (isar_generator + build_runner) didn't fit this package's zero-build-step philosophy for a first release. The CacheStorage interface is small; an Isar adapter is a welcome contribution following SqliteCacheStorage's shape.