Milestone 0.4: a history graph webview (heads, dependencies, signature marks) with per-change actions (diff, check out, describe, tag, abandon), File History with diffs between versions, and inline blame aligned to unsaved edits.
Milestone 0.3: bookmark picker in the status bar (switch, create, merge, delete), fetch, pull, push and push-bookmark with results, a sync counter and Sync action, confirmation before pushing.
Milestone 0.2: discard changes (with confirmation), commit selected paths, commit chosen hunks, amend, undo the last operation, and an Oxygen Operations view with "Undo to here".