Import cmd-shim source, tests, and snapshots from pnpm/cmd-shim at
83f9b9449c2adeec26e1cc2d03ef0fe82d2e41ca. Maintaining the shim alongside
its consumers removes the need for coordinated changes across repositories.
Publish the package as `@pnpm/bins.cmd-shim` and replace external dependencies
with workspace links. Preserve the original BSD-2-Clause license, including
its copyright notice, and keep the manifest updater from replacing it with MIT.
Reuse `@pnpm/fs.graceful-fs` and integrate the existing Node.js tests with the
workspace test scripts. Retain the existing snapshots and align the version
with the TypeScript workspace's required 1100.x band.