add cross-platform support for rm and cp by empowering shx

[herzykj]

No description provided.

[Copilot]

Pull Request Overview

This PR adds cross-platform support for file system operations by replacing Unix-specific rm and cp commands with the shx package, which provides cross-platform shell commands.

• Replaced rm -rf ./bin with shx rm -rf ./bin in the clean script
• Replaced cp -r with shx cp -r in the copy-json script
• Added shx as a dev dependency

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