feat(client): add hincrby - #305
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adds a full typed command API and pipeline builder on top of the existing raw `send()` method. no new crate — the types layer cleanly on what's there. commands covered: get/set/set_ex/del/exists/expire/persist/ttl/pttl/ incr/decr/incrby/decrby/append/mget/mset/getdel (strings), lpush/rpush/ lpop/rpop/lrange/llen (lists), hset/hget/hgetall/hdel/hexists/hlen/hkeys/ hvals (hashes), sadd/srem/smembers/sismember/scard (sets), zadd/zrange/ zrange_withscores/zscore/zrank/zrem/zcard (sorted sets), ping/dbsize/flushdb. `Pipeline` is a chainable builder that writes all frames in a single syscall and reads responses sequentially, keeping pipelining cost to one flush per batch. `ClientError::Server` is new — server-returned errors (`WRONGTYPE`, etc.) are now distinct from wire-level `Protocol` errors.
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summary
adds
Client::hincrbyandPipeline::hincrby— the last command present in the gRPC API but missing from the typed RESP3 client. the rust client now has full parity with the gRPC surface.what was tested
cargo build -p ember-client— cleancargo clippy -p ember-client -- -D warnings— cleancargo fmt --all --check— cleancargo test -p ember-client— 21 unit + 5 doc tests passhincrby_increments_and_returns_new_valuecovers positive delta, negative delta, and field creation on first use