Chunk 5.0

## Summary In this chunk, we transitioned from addressing Docker network bottlenecks to stabilizing the test environment after a host network mode attempt introduced port conflicts with existing services. After reverting to bridge networking, we successfully got the test cluster into a clean, working state: the default `./docker-compose.yml` now validates and starts properly with a newly created `data/config/settings.env` file, and the single-node cluster runs correctly after adding the required `EXTERNAL_LOCALWEB_URL` configuration and fixing the S3 loadtest to send the `x-amz-content-sha256: UNSIGNED-PAYLOAD` header. The committed changes include the CQL batcher implementation for high-throughput S3 metadata writes, loadtest improvements (distinguishing timeouts from actual corruption, plus the content-SHA256 header fix), and test-cluster configuration fixes (adding `RIBS_RETRIEVALBLE_REPAIR_THRESHOLD` and using semicolons for the kuri init command). The single-node test cluster is now operational, and the remaining uncommitted items are limited to documentation updates (`test-cluster/README.md`) and untracked artifacts.

From Host Network Collapse to Clean Working State: A Distributed S3 Test Cluster's Debugging Odyssey 3311 words

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