chore: release v1.20.1-beta.1

[Soju06]

Summary

• Prepares beta release v1.20.1-beta.1 for the 1.20.1 stable train.
• Updates release-managed version files only; release-please remains the stable release owner.
• Merging this PR will publish v1.20.1-beta.1 only after the release-candidate validation checklist below is completed for this exact candidate SHA.
• Synced automatically from release-please PR chore(main): release 1.20.1 #1039; no manual beta workflow dispatch is required.

Changes since v1.20.0

• perf(dashboard): split request log page count (perf(dashboard): split request log page count #1038) (ea6dc8b)
• fix(release): guard stable artifact publishing (fix(release): guard stable artifact publishing #1049) (
  30aa30)

Release-candidate validation

Validated candidate: 46179d2

Complete these checks on the exact candidate SHA above before merging. The beta release guard and publish workflow fail while any item remains unchecked or the SHA is stale.

• Backend/unit/integration gates
• Frontend tests/build
• Wheel/package validation
• Docker/container smoke
• Live upstream/account smoke
• Live upstream/account smoke not required

Install after publish

uvx --from "codex-lb==1.20.1b1" codex-lb
docker pull ghcr.io/Soju06/codex-lb:1.20.1-beta.1
helm install codex-lb oci://ghcr.io/soju06/charts/codex-lb --version 1.20.1-beta.1 --devel

Promotion

Merge the normal release-please PR to promote this beta-tested train to 1.20.1.

[Soju06]

Superseded by the current beta release train v1.20.2-beta.1 from release-please PR #1087. Closing this automation-managed beta PR to avoid publishing an obsolete train.