Update defaults, env handling, and deps for getgo Set default install path to ~/.go instead of the current directory. Create a 'current' symlink to the installed Go version. Unattended mode writes Go environment variables automatically. Improve GOROOT/GOPATH setup in shell configuration files. Update Go module to 1.25.0 and bump dependencies (fatih/color v1.19.0, golang.org/x/sys v0.42.0).