[Alex R (alexr17)]

GKE's worker example currently offers only node-local sandbox storage.
Add an opt-in checkpoint overlay and rollout instructions for the next Braintrust release.

Input	Expected behavior and checked boundary
Overlay omitted	Existing retention-off configuration is preserved
Overlay with a GCS checkpoint URI	Durable storage configuration, longer worker shutdown grace, and checkpoint memory reservation render
Old retained values or partial overrides	Explicit retention/store/image values work with the compatible worker chart without empty controller arguments
Retention null or disabled; checkpoint store null	Existing disabled configuration renders; rollback still needs coordination for retained sandboxes
Zero worker replicas	The worker controller receives the zero target and continues to own draining
Release tags with/without v, full/short/numeric SHAs, prerelease and custom tags	No new image-tag restrictions; each format renders
AWS, Google, Azure and minimal primary-chart configurations	Existing primary-chart rendering remains unchanged

The overlay was rendered against the compatible worker chart source across 14 configurations; this does not establish live GCS or Firecracker recovery.

[chatgpt-codex-connector]

Codex Review Summary: ✅ Completed

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-11-09T18:25:18.347257Z	6d4d069	Draft marked ready

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