Move module declaration and all internal imports from
github.com/Snider/Borg to forge.lthn.ai/Snider/Borg. Also updates
Enchantrix dependency path to forge.lthn.ai/Snider/Enchantrix.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Wire the Progress interface into the CLI by adding a --quiet/-q global
flag and a ProgressFromCmd helper that returns QuietProgress (stderr)
when --quiet is set, or DefaultProgress (TTY-aware) otherwise.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>