[austin-barrington]

Version bump to 0.9.3-beta, with release notes (docs/user-guide/release-notes-0.9.3-beta.md). The Python client, still at 0.9.1b0, becomes 0.9.3b0; the JS and Rust clients were already 0.9.3-beta.

A correctness and security release. 0.9.2-beta and earlier:

• store values in the wrong column (Stack prepared batches by column name: values were stored in the wrong column #123)
• store a conflicting field type as null (Field type conflicts are a partial write, not null #122)
• lose acknowledged writes in a rolling restart of a replicated cluster (Keep every acknowledged write through a rolling restart #124)
• trust the compromised eMudhra CA, CVE-2026-111943 (Stop trusting the compromised eMudhra CA (CVE-2026-111943); patch rustls, h2, quinn-proto #125)

Also in this release:

• top/bottom/sample, and working subqueries over aggregates (Add TOP, BOTTOM and SAMPLE; fix subqueries over aggregates #127)
• cluster.peers formation (Promote cluster.peers learners as they catch up; no 503 after /health is 200 #126)
• the tag value count after a restart (Count a tag value once, also after a restart #119)
• X-Hyperbytedb-Version (Add X-Hyperbytedb-Version #120)
• the Go, JS/TS and Rust clients (Add Go, JavaScript/TypeScript and Rust clients #121)

The runtime image stages now fail if the CA bundle still has the eMudhra root. Their apt step changed, so the release build re-runs it even with the layer cache.

Pair with operator v0.3.3 once it's out (hyperbytedb-operator #19, #20): it fixes backups (minio/mc can no longer be pulled) and restarts each pod once per update. v0.3.2 runs 0.9.3-beta.

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PR Summary

Low Risk
The PR only bumps versions and adds release documentation; no runtime code paths change in this diff.

Overview
Release packaging for HyperbyteDB 0.9.3-beta: Rust crates (hyperbytedb, hyperbytedb-cli, hyperbytedb-proxy) and Cargo.lock move from 0.9.2-beta to 0.9.3-beta. The Python client is aligned from 0.9.1b0 to 0.9.3b0 in pyproject.toml and __version__.

Adds docs/user-guide/release-notes-0.9.3-beta.md (security/CVE-2026-111943, storage/replication/query fixes, new selector functions and clients, upgrade notes) and wires it into mkdocs.yml. Operator cluster.md examples now use version: "0.9.3-beta".

This diff is version metadata and user-facing release documentation; the behavioral changes are described in the release notes and referenced issues (#119–#127), not in the files touched here.

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