fix(sandbox): Recover cleanly from unavailable sessions#1012
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Fail the current operation as a safe tool error without replaying it, then lazily reacquire the disposable sandbox on a later operation. Pin SDK work to the acquired session and scope invalidation to its session identity. Refs #966
Expose FileSystem and session-level operations in Vercel Sandbox mocks so unit coverage exercises the pinned-session adapter.
Let each pinned session invalidate manager state directly when Vercel reports a lifecycle failure. Keep tool boundaries responsible only for safe error translation, and use session terminology outside the egress layer.
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Sandbox operations now fail the current call with a safe tool error when the
acquired Vercel session becomes unavailable, retain the persistent sandbox ID,
and lazily reacquire on the next call. No operation is replayed, so commands
and writes with uncertain side effects remain safe.
This supersedes #966's per-tool retry approach by pinning SDK work to the exact
acquired session and centralizing lifecycle invalidation. Session-scoped errors
also cannot invalidate a newer session during parallel work. Regression
coverage includes setup and restore failures, file and command interruptions,
lazy cache rebinding, and late concurrent failures.