Sandboxes now have a dedicated workspace on disk.

What's new: — Upload files once via POST /files — Exec by filename — no code in the request body — Workspace persists between runs — Zero config locally, overridable via PETRI_WORKSPACE_ROOT

The foundation for delta sync and auto dependency detection.

Full write-up: https://dev.to/thearun85/the-case-for-persistent-sandboxes-in-ai-code-execution-3158