v0.2.1

Fixed

• The improve worktree's base-ref probe asked git rev-parse about the
  process's current directory rather than a named repository. The only
  behavior change is to its test, which built a fixture repository and then
  asserted against whichever repository it happened to run inside: green on a
  checkout that had origin/main, red on one that did not, which is what a
  tag checkout is. v0.2.0 was tagged but never published for this reason.