TaggableStore

Begin executing a new tags operation.

Determine if this store currently supports tags.

Stores whose tag support depends on configuration or composition override this; for everything else extending TaggableStore, tag support is unconditional. A store that can return false here must also throw a NotSupportedException from tags() because Repository relies on the store to enforce its own conditional support.

Get the tag mode this store operates under.

Default matches TaggableStore::tags() semantics (all-mode: keys are namespaced by the tag set). Subclasses override if they deviate.