Get (or lazily construct) the process-default cache. Starts with no
sources — adapter factories register themselves via addSource on
construction. Until at least one source is added, the cache returns
empty snapshots and withModelNotFoundFallback degrades to surfacing
the original error (safe).
Get (or lazily construct) the process-default cache. Starts with no sources — adapter factories register themselves via
addSourceon construction. Until at least one source is added, the cache returns empty snapshots andwithModelNotFoundFallbackdegrades to surfacing the original error (safe).