feat: S3 object storage offloading for V3 bucket data#673

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Commits on Jun 16, 2026

test: add red tests for Phase 2b S3 write path
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feat: implement S3 write path (Phase 2b) and add Phase 2c read red tests
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feat: implement S3 read path in getBucketDataBatch, add Phase 2d red test
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feat: S3-aware compaction and S3ObjectStorage (Phases 2d, 2e)
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fix: S3 path format, batch sizing, CLEAR upload, and path reuse test
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refactor: apply review fixes to S3 offloading implementation
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test: add V3 compaction tests with S3 object storage
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chore: fixup rebase conflicts and upstream renames
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refactor: centralize S3 compression in BucketDataObjectStorage, improve size tracking and orphan cleanup
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