Fix auth whoami alias

[crcatala-vps]

Summary

Fixes tt auth whoami, which failed with Commander’s too many arguments for 'status' error instead of behaving as the documented alias for tt auth status.

Technical details

whoami delegates to the registered status subcommand with parseAsync(..., { from: "user" }). In that mode Commander expects only the selected subcommand’s arguments; supplying "status" again made it an unexpected positional argument. The delegation now passes only --json when requested, or an empty argument list otherwise.

Adds an isolated CLI regression test that runs auth whoami with a temporary HOME, verifies successful execution and the unauthenticated status output, and guards against the prior argument-parsing error.

Testing done

• bun run test (422 passed; 42 live tests skipped)
• bun run typecheck
• bun run lint

Checklist

• Code follows the project style
• Regression test added
• New and existing tests pass
• Documentation update not needed