Update Borg and Enchantrix dependency paths from github.com/Snider/
to forge.lthn.ai/Snider/ across go.mod and imports.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Move distributed bug fixing app from core/cli internal/bugseti/ and
cmd/bugseti/ into its own module. Library code at package root,
app entry point in cmd/, design docs in docs/.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>