feat(cli): uninstall opencode installed via windows package managers

[itsrainingmani]

Fixes: #8573

What does this PR do?

• Adds uninstall information and commands for choco/scoop installs
• Extends bun remove -g opencode-ai on windows to clean leftover installed artifacts -
  • binaries: .bun\bin\opencode.{exe|bunx}
  • node_modules: .bun\install\global\node_modules\opencode-windows-x64{-baseline}
• Informs user if they're trying to uninstall opencode via choco from a non-elevated command shell

How did you verify your code works?

I tested every install method on Windows (Windows Terminal, WezTerm) and uninstalled w/ every method to ensure that the uninstallation happens cleanly and does not leave behind artifacts.

Bun Remove

Choco Uninstall

Scoop Uninstall

[github-actions[bot]]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions[bot]]

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No duplicate PRs found