krabka streams for Java 1.4.2

krabka streams for Java is the Java client library for stream processing with krabka. It exports the Apache Kafka Streams API unchanged and adds krabka schema registry serdes and Apache Arrow columnar batch processing.

The API is split across four artifacts, one per package group below. Each artifact depends on io.krabka:krabka-streams, so any one of them pins the Kafka Streams API version. See the guides for configuration, broker requirements, and worked examples.

Package	Description
io.krabka.streams	Defaults and entry points for Apache Kafka Streams applications.
io.krabka.streams.columnar	Apache Arrow batch codecs, topology operators, runners, and state handling.
io.krabka.streams.columnar.barrier	Barrier-aligned, epoch-keyed state snapshots for columnar runners.
io.krabka.streams.columnar.schema	Avro and Protobuf bridges into the Arrow columnar runtime.
io.krabka.streams.coordination	Leader election, leases, and fencing tokens for one role.
io.krabka.streams.schema	Confluent-wire-compatible Avro, Protobuf, and JSON Schema serdes.
io.krabka.streams.test	In-memory columnar and schema-registry test helpers.