Product updates: VM Sandboxes, Lower latency routing, RBAC, and more

Recent Modal product updates and community news, including lower-latency regional routing (US West, EU West, Asia Pacific South), VM Sandboxes (Alpha) with Linux kernel support for Docker and eBPF, domain allowlisting for Sandboxes, Modal Skills CLI for managing Agent Skills, and Role-Based Access Control for Team and Enterprise plans. Also covers Named Images, workspace limit UI improvements, volume subdirectory mounts with sub_path scoping, Sandbox readiness probes (GA), configurable Sandbox snapshot TTLs, and SDK updates (Python 1.5.0, JS and Go 0.8.0).