git pull --no-edit fails with exit 128 on divergent branches because
fast-forward is impossible. Using --rebase handles divergent histories
by rebasing local commits on top of fetched remote commits, producing
a linear history without merge commits.
- src/Converge.hs: Change gitPull from --no-edit to --rebase
- test/GitPullSpec.hs: Update rebase test to expect success and
verify linear history (3 commits, no merge parents)
- test/*.hs: Clean up unused imports
jbrechtel
4bc23b5d7c