Refactor cloud-agent cli entry point

[jxnl]

Refactor the cloud-agent.tsx CLI entry point to improve code quality, maintainability, and error handling.

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Important

Refactor cloud-agent.tsx to improve code structure, error handling, and command registration logic.

• Functions:
  • Introduced printApiKeyError() for consistent API key error messaging.
  • Added createProgram() to encapsulate Command creation and registration.
  • Added showInteractiveMenu() to handle interactive menu rendering.
• Error Handling:
  • Enhanced error handling in main() to log stack trace if DEBUG is set.
  • Improved error message for missing CURSOR_API_KEY.
• Command Registration:
  • Refactored command registration to use createProgram() for both help and execution contexts.
  • Simplified command detection logic in main() using program.commands.some().
• Misc:
  • Removed redundant command registration logic.
  • Updated version retrieval from package.json.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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