kafrust 0.3.2

Summary

• Publish kafrust-protocol 0.3.2 before kafrust 0.3.2 so isolated Cargo packages resolve matching protocol types.
• Publish the alpha StreamsGroupSession, bounded StreamsGroupSessionHandle, task-state commands, assignment snapshots, and assignment-watch API.
• Record single-broker multi-member and three-broker Streams coordinator-failover qualification workflows.
• Make published smoke and comparison workflows default to kafrust 0.3.2.

Breaking changes

• None intended for this patch release. The Streams group surface is alpha and may change before 1.0.

Migration notes

• Existing 0.3.1 users can update both crates to 0.3.2 through the normal Cargo version update.
• StreamsGroupSessionHandle is a membership/heartbeat layer only; applications still own task-runtime reconciliation and must await graceful close().

Compatibility evidence

• Workspace CI passed on stable Rust and Rust 1.81 in run 32377776401.
• Published Streams API compilation passed on stable Rust and Rust 1.81 in run 32377502460.
• Live Streams membership and coordinator-failover evidence is recorded in run 32373425539 and run 32374858753.

Known limits

• This is an alpha client release, not a claim of complete rust-rdkafka parity or Kafka broker replacement.
• Streams DSL execution, state stores, automatic task-runtime reconciliation, and a complete Kafka Streams application test remain open.
• Broader production canary, failure, security, performance, and migration qualification remain on the 1.0 roadmap.