Note

Strengthens coverage for data store behavior, persistence interactions, and FDv2 integration.

• InMemoryFeatureStoreV2 tests: initialization, string/symbol key compatibility for get, all filtering (excludes deleted), set_basis replacement/clearing/error handling, apply_delta (adds/updates/deletes, empty deltas), and thread-safety under concurrent reads/writes.
• Store tests: applies TRANSFER_FULL via set_basis, TRANSFER_CHANGES via apply_delta, handles TRANSFER_NONE, processes DELETE, broadcasts change sets, and commit behavior with/without persistent store including encoding, failures, and read-only mode.
• FDv2 persistence tests: verify delta upserts in READ_WRITE, no writes in READ_ONLY, persistence across initializer vs synchronizer, recovery/flush on stale store, and presence/behavior of data store status provider.

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