improve agent runtime cycle times

[zreigz]

Test Plan

Checklist

• I have added a meaningful title and summary to convey the impact of this PR to a user.
• I have added tests to cover my changes.
• If required, I have updated the Plural documentation accordingly.

[greptile-apps]

Confidence Score: 5/5

The CRD-only change appears safe to merge, with no concrete schema or compatibility defect identified.

Summary

This PR extends the bundled AgentRuntime CRD with optional mise configuration and control over the default container’s read-only root filesystem.

• Adds mise.config for supplying a mise.toml to agent workloads.
• Documents bootstrap behavior for writable and read-only root filesystems.
• Adds readOnlyRootFilesystem while preserving the current writable default.

_{Reviews (1) · Last reviewed commit: "improve agent runtime cycle times"}