Complete the Git commands: Git Pull: Fetching and Integrating Remote History

Create a disposable bare repository and two working clones. Publish an initial commit, then create a new remote commit from the second clone. In the first clone, record HEAD and the remote-tracking tip, run an explicit `git pull --ff-only origin main`, and verify that the local branch advances to the fetched commit without creating a merge commit. Then create independent local and remote commits from a common base and compare `git pull --ff-only origin main` with `git pull --no-rebase origin main` in separate disposable repositories. Record which state changes occur in each case and verify that no pull command publishes local commits back to the remote.