* feat(commits): distinguish workspace history from base commits
Keep every workspace commit visible while bounding base history to ten
context commits, and make push and base state readable in the commit rail.
* fix(commits): preserve history when base refs disappear
Fall back to recent HEAD history for stale saved bases, and reject truncated
git output instead of presenting an incomplete commit list.
* fix(commits): classify history against the current base
Use the furthest-ahead local or remote base for classification, and re-infer
base history when saved worktree metadata points to a deleted branch.
