Upgrade agent-sandbox to v0.5.2 or a later stable release

[acsoto]

What would you like to be added:

Upgrade AgentCube from sigs.k8s.io/agent-sandbox v0.4.6 to v0.5.2 or a later stable release.

PR #387 intentionally stopped at v0.4.6 because agent-sandbox v0.5 introduces a broader v1alpha1 to v1beta1 API and storage migration. This follow-up should investigate the required compatibility changes, update the integration, and add appropriate unit and E2E coverage.

The upgrade should preserve existing direct Sandbox and CodeInterpreter warm-pool behavior, including SandboxClaim adoption, session deletion, garbage collection, and pool refill.

Existing v0.4.6 installations and active SandboxClaims should also have a documented and tested upgrade path.

References:

• [v0.2.0] Call for proposals #386
• fix: adapt code interpreter warm pool to agent-sandbox v0.4.6 #387
• https://github.com/kubernetes-sigs/agent-sandbox/blob/main/docs/api-migration-guide.md
• fix: Fix warm-claim cold restart on v0.5.0 upgrade due to un retried optimistic lock conflicts kubernetes-sigs/agent-sandbox#1124

Why is this needed:

AgentCube currently depends on v0.4.6 and still uses the upstream v1alpha1 APIs. Moving to the latest stable release keeps AgentCube aligned with the supported agent-sandbox API and includes important correctness and security fixes added after v0.4.6.

Upstream warns that v0.5.0 and v0.5.1 can disrupt active warm-started claims during an upgrade. The target version must therefore be v0.5.2 or a later stable release containing the fix from kubernetes-sigs/agent-sandbox#1124.

[acsoto]

/kind enhancement

[acsoto]

#431 explores a new SandboxPool-based node-local resource path for the fast/slow resource architecture. This issue tracks the other line: keeping AgentCube's existing Kubernetes-native agent-sandbox backend healthy and aligned with upstream.

Keeping this backend current gives AgentCube a stable community path while the SandboxPool direction evolves separately.

[safiya2610]

/assign

[acsoto]

@safiya2610 Thanks. pls wait for the release of agent-sandbox v0.5.2

[ranxi2001]

@safiya2610 agent-sandbox v0.5.2 has been released: release notes. It includes the warm-claim upgrade fix from #1124, which was the prerequisite noted above. The release prerequisite for this issue is now satisfied, so the upgrade can proceed when you have time. Thanks!

[safiya2610]

@safiya2610 agent-sandbox v0.5.2 has been released: release notes. It includes the warm-claim upgrade fix from #1124, which was the prerequisite noted above. The release prerequisite for this issue is now satisfied, so the upgrade can proceed when you have time. Thanks!

Thankyou for the update!

[safiya2610]

@acsoto Please review the PR.