Pre-check key existence before delete to return accurate deleted count. This unblocks integration tests while proper RaftResponse propagation is deferred to T053. - Single key: check exists via state_machine.kv().get() - Range: count keys via state_machine.kv().range() - Returns deleted=1 if key existed, deleted=0 otherwise Integration tests now pass: 3/3 ✓ Refs: T059.S2 Option A (approved by PeerA) |
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