Preserve MSCmd whitespace arguments

[salva]

Summary

Fix Net::OpenSSH::ShellQuoter::MSCmd so it preserves empty arguments and arguments containing spaces or tabs.

Changes

• Keep the existing cmd metacharacter escaping.
• Wrap empty and whitespace-containing arguments in double quotes after escaping.
• Add focused unit tests for plain, empty, whitespace, metacharacter, and newline cases.
• Add the new test file to MANIFEST.

Fixes #47.

Testing

• perl -Ilib -c lib/Net/OpenSSH/ShellQuoter/MSCmd.pm
• perl -Ilib t/mscmd-quoting.t

[Copilot]

Pull request overview

This PR fixes Net::OpenSSH::ShellQuoter::MSCmd so cmd.exe argument quoting preserves empty arguments and arguments containing spaces/tabs, preventing argument-vector corruption when remote_shell => 'MSCmd' is used.

Changes:

• Update MSCmd->quote to wrap empty and whitespace-containing arguments in double quotes (after existing metacharacter escaping).
• Add a focused unit test covering plain, whitespace, empty, metacharacter-escaping, and newline-rejection cases.
• Include the new test in MANIFEST for packaging.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
lib/Net/OpenSSH/ShellQuoter/MSCmd.pm	Quotes empty/whitespace args to preserve argument boundaries while keeping existing cmd metacharacter escaping.
t/mscmd-quoting.t	Adds unit coverage for the updated MSCmd quoting behavior and newline rejection.
MANIFEST	Ensures the new test file is shipped in release tarballs.

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