chore(kubernetes): deploy sandbox-agent sidecar

[mmabrouk]

Context

The Helm chart still deploys API/services without a sandbox-agent service, so Kubernetes testers cannot exercise the external runner path from the agent runtime POC. This PR adds the Kubernetes deployment slice while keeping Railway and image-build work separate.

This PR is stacked on #4786 and should be reviewed with the existing agent-workflows POC PRs (#4771, #4772, #4776, #4778, #4779).

Changes

Adds Helm templates for the sandbox-agent deployment and service, wires sandbox-agent settings through values and schema validation, and updates OSS/EE example values. The services deployment now receives the runner endpoint and related secret wiring from the chart.

Tests / notes

• Split from the previously validated working tree. Helm template renders were verified before the branch split.
• I did not rerun Kubernetes deployment after creating this PR branch.

What to QA

• Render the Helm chart with OSS and EE example values. The output should include sandbox-agent deployment and service objects.
• Deploy the chart in a test cluster with Daytona credentials. The services pod should call the in-cluster sandbox-agent service for agent runs.

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Project	Deployment	Actions	Updated (UTC)
agenta-documentation	Ready	Preview, Comment	Jun 20, 2026 11:40pm

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