When no ref is specified in a remote Taskfile URL, go-getter was being
passed ref=HEAD which git interprets as a literal branch name, causing
"Remote branch HEAD not found" errors.
Now we omit the ref parameter entirely when not specified, letting git
clone the remote's default branch.
* feat: redact credentials in remote urls
* chore: improve function naming
* fix: TaskfileNotSecureError should use redacted URI
* feat: unexport all node implementation fields
* fix: unexport HTTPNode.url
