Enhance Windows MSI upgrade with better fallbacks and error handling

[devin-ai-integration]

Windows MSI Upgrade Enhancement

Similar to PR #244, this PR enhances the Windows MSI upgrade functionality in the agentuity upgrade command to match the behavior in the installer scripts.

Changes

• Added detection for non-interactive environments (CI, GitHub Actions)
• Added fallback to copy the MSI installer if automatic installation fails
• Improved error handling and user feedback
• Added better messaging for manual installation steps

Testing

• Code changes have been tested with go test -v ./...
• Manual testing on Windows is recommended to fully verify the changes

Link to Devin run

https://app.devin.ai/sessions/1dc1a12e734f454aaa7ac2ebb8255baf

Requested by: jhaynie@agentuity.com

[devin-ai-integration]

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[jhaynie]

will this change work in the case the cli is already installed and handled the case where msiexec fails because the program is already installed?

[devin-ai-integration]

Yes, this change handles the case where the CLI is already installed in two ways:

1. First, it runs a PowerShell uninstall script that checks for and removes existing Agentuity installations before attempting to install the new version.

2. If the installation fails (including the case where msiexec fails because the program is already installed), the code now has a fallback mechanism that:

   • Shows a warning message about the installation failure
   • Copies the MSI installer to the user's home directory
   • Provides instructions for manual installation

The implementation tries multiple installation approaches in sequence:

1. Direct install with
2. Update with if direct install fails
3. Reinstall with , , and if update fails
4. Fallback to manual installation if all automated approaches fail

This ensures that even if the automatic installation fails for any reason, the user still has a way to complete the upgrade manually.