x-kv: a distributed transactional KV store. v2 rewrite — proto / api / protocol layers redesigned against TiKV v8.x. Built on x-raft-lib for Raft, RocksDB for storage, gRPC for transport. Modules: - proto: gRPC + protobuf wire definitions - pd: Placement Driver (cluster metadata, TSO, scheduler) - kv: Multi-Raft KV store with MVCC + Percolator - client: PD-aware Java SDK (raw KV + transactional) - tests: ...