DirectoryMessagePackBackingStore loses HydrationFilter, FlushStageProbe,
ReadStageProbe and their stage constants, ReadPersistedGeneration,
PullSelected, and every legacy path: the v2 directory-indexed and v3
immutable-pages formats, v1 inline records and split pages, the index
upgrade on flush, and the legacy page paths. CacheBackingStore.PullSelected
and CultPersistedRecordMetadata go with them.
A missing manifest is an empty store. An existing manifest whose
FormatVersion is not cultcache.store.v4.directory-content-addressed-pages
throws "Directory store {path} is {format}; only {v4} is readable." A clean
flush writes nothing, since there is no legacy index left to upgrade.
Tests deleted with the surface they injected through: the v1 missing-catalog
load, pages-before-manifest, fault-before-manifest (4 cases), same-timestamp
page, mutation-during-flush and reader-lease tests. The orphan-page test now
checks through a fresh store pull instead of ReadPersistedGeneration.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Removes FlushBackingStore, both PrepareForReloadOrShutdown overloads,
PullBackingStoreRecordsAsync, TryGet<T>, TryGetByName, TryGetByIndex,
Resolve<T>, the cache and store Logger, and LastSuccessfulFlushAtUtc on the
cache and stores. GetStoredDocuments<T> folds into GetAll<T>.
The soft flag goes from FlushAllBackingStores, ExecuteTransactionAsync,
CommitBatch and PushAll. It stays on FlushAsync(bool) because
CultCacheStudioWindow reflects on that signature until Cut 6.
CultMesh.FlushAsync and CultNetLocal.FlushAsync keep their parameter and
stop forwarding it.
The store's EntryAdded/EntryUpdated/EntryDeleted subjects become
protected internal Loaded/Unloaded callbacks set by the cache at attach.
AddStoredDocumentInternal is synchronous, so the GetAwaiter().GetResult()
bridges on the store subscriptions and the global materializer are gone.
Tests: drop the LastSuccessfulFlushAtUtc asserts; OpenAsync and GetAll tests
read through Get/GetAll; the persisted-global test proves the durable global
loads without staging a default instead of going through selective hydration;
the lease-before-observers test observes through CultCache.Watch; the
PullSelected selective-hydration test is deleted.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
