// Package inventory is the Redis-backed stock + reservation service.
//
// Two distinct services coexist in this package and they are NOT
// redundant; they exist for different callers:
//
//   - redis_service.go            — stock levels and basic get/batch/reserve.
//   - redis_reservation_service.go — cart-shaped reservations (with release
//                                     + available-quantity semantics, used by
//                                     go-cart-actor via the adapter).
//
// `Level` (level.go) is the canonical shape returned by readers and
// accepted by writers; it is reused across both services.
//
// adapter.go bridges to platform/inventory.ReservationPolicy so other
// services depend on the platform interface, not on this package.
//
// listener.go subscribes to the inventory_changed Redis pub/sub channel
// and mirrors upstream events into the local cache.
//
// TODO: types.go mixes storage types (InventoryItem, InventoryReference)
// with request types (CartReserveRequest, ReserveRequest). Split into
// `types/storage.go` and `types/cart.go` so callers can depend on only
// what they need. Start by moving CartReserveRequest + ReserveRequest to
// `types/cart.go` and adjusting the imports in cmd/*.
package inventory