CultNetDatabase watched OnUpdate, which fires for loads alone, so cache.Commit,
cache.UpsertAsync, variant dependents re-resolved by a base edit and Flatten never
reached subscribers or the mutation log, and a load removal carried an empty key.
The database now observes cache.Watch, the one owner of admitted changes. A write
door of the database (PutAsync, DeleteAsync, ApplyPut/Delete, replica apply, sync)
marks the key it is committing and publishes that change itself, since it carries
the shard-log entry; every other change publishes from the cache, keyed.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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