Vouch request: [hasnatelias]

[hasnatelias]

What do you want to work on?

I want to implement #2585 by adding shared host-folder support for libkrun-based VM sandboxes. The change uses virtiofs to expose a configured host directory inside the guest, mounts it before the sandbox workload starts, validates source and target paths, and preserves existing behavior when no mounts are configured.

Why this change?

VM sandboxes currently cannot access a live host workspace, unlike Docker and Podman sandboxes. This change enables bidirectional file sharing so agents inside a VM can work directly with host project files while retaining VM isolation.

Checklist

• I wrote this request myself (not AI-generated)
• I have read CONTRIBUTING.md