Verify nvm Installation

Run diagnostic checks to confirm nvm is installed and loading correctly.

Workflow

1. Check nvm, node, and npm:

   nvm --version    # Should print nvm version (e.g., 0.40.1)
   node -v          # Should print Node version
   npm -v           # Should print npm version
   command -v nvm   # Should print "nvm" (it's a shell function)