[0xmhha]

Summary

Updates docs/ROADMAP.md now that the work is delivered:

• Every item links to the pull requests that delivered it. All items are done except feat(execution): add ResumeRun to replay output after a dropped stream #3, the Go module cache path on the owner's machine.
• A new section lists the defects found and fixed along the way.
• A new section lists what is still open outside the list: publishing release runtime images to ghcr.io, and testing on a multi-node Kubernetes cluster, Redis Cluster and gVisor with the KVM platform.

Testing

Documentation only.

Not verified

Nothing applies.