* feat(ecstore): batch small file fdatasync commits
Add a default-off experimental file fdatasync group commit path for small rename_data shard directories. The coordinator batches same-disk waiters into one blocking task while preserving per-directory source fsync after shard contents are durable.
Co-Authored-By: heihutu <[email protected]>
* test(e2e): wait for compression S3 readiness
Reuse the shared S3 API readiness probe for compression test servers so multipart requests do not race the startup readiness gate after the TCP port opens.
Co-Authored-By: heihutu <[email protected]>
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Co-authored-by: heihutu <[email protected]>
