chore(main): release 4.0.0

[release-please]

🤖 I have created a release beep boop

4.0.0 (2026-01-29)

⚠ BREAKING CHANGES

• Change contructors of MRD and AAOW AsyncGrpcClient.grpc_client to AsyncGrpcClient (#1727)

Features

• Add context manager to mrd (5ac2808)
• Add context manager to mrd (#1724) (5ac2808)
• Add default user agent for grpc (#1726) (7b31946)
• Add micro-benchmarks for reads comparing standard (regional) vs rapid (zonal) buckets. (#1697) (1917649)
• Add micro-benchmarks for writes comparing standard (regional) vs rapid (zonal) buckets. (#1707) (dbe9d8b)
• Add support for opening via write_handle and fix write_handle (2bc15fa)
• Add support for opening via write_handle and fix write_handle type (#1715) (2bc15fa)
• experimental: Integrate writes strategy and appendable object writer (#1695) (dbd162b)
• Expose finalized_time in blob.py applicable for GET_OBJECT in ZB (8e21a7f)
• Expose finalized_time in blob.py applicable for GET_OBJECT in ZB (#1719) (8e21a7f)
• grpc_user_agent: Send user_agent to grpc channel (#1712) (cdb2486)
• Move Zonal Buckets features of _experimental (#1728) (74c9ecc)
• Move Zonal Buckets features of _experimental to (74c9ecc)
• samples: Add samples for appendable objects writes and reads (2e1a1eb)
• samples: Add samples for appendable objects writes and reads (#1705) (2e1a1eb)
• Update generation for MRD (#1730) (08bc708)
• ZonalBuckets: Add support for generation=0 to avoid overwriting existing objects and add is_stream_open support (#1709) (ea0f5bf)
• ZonalBuckets: Add support for generation=0 to prevent (ea0f5bf)

Bug Fixes

• Change contructors of MRD and AAOW AsyncGrpcClient.grpc_client to AsyncGrpcClient (#1727) (e730bf5)
• experimental: Implement requests_done method to signal end of (6c16079)
• experimental: Implement requests_done method to signal end of requests in async streams. Gracefully close streams. (#1700) (6c16079)
• Fix formatting in setup.py dependencies list (#1713) (cc4831d)
• Instance grpc client once per process in benchmarks (#1725) (721ea2d)
• Instance grpc client once per process in benchmarks. (721ea2d)
• Update write_handle on every recv() from write object stream. (5d9fafe)
• Update write handle on every recv() (#1716) (5d9fafe)

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