Vercel Sandbox 2.8.0

Patch Changes

• Add @vercel/sandbox-mock, a drop-in mock for @vercel/sandbox backed by just-bash. Rather than reimplementing the SDK surface, it runs the real @vercel/sandbox classes against an in-memory implementation of the /v2/sandboxes HTTP API injected through the SDK's fetch seam — so command execution, filesystem, multi-user/group management, snapshots, and forking all exercise the real SDK code. Commands run locally via just-bash against an in-memory filesystem, and command()/setupSandbox() let tests stub the output of commands just-bash can't run. (#245)

  As part of this, Snapshot.get now forwards a custom fetch (via WithFetchOptions), matching Snapshot.list and Snapshot.tree. Previously it always used the global fetch, so an injected client — such as the mock — could not intercept the request.