v0.4.3 — apply-zip structure fix, self-update command

Added

• contextzip update / cz update — checks PyPI for a newer release and
  updates in place, matching however you installed it (pip, pipx, or
  uv tool). Use --check to just see if one's available, --yes to
  skip the confirm.

Fixed

• apply-zip was dumping a nested copy of your project at the root
  instead of updating files in place, whenever the AI-returned zip's
  wrapper folder happened to share a name with a real folder already in
  your project (very common — e.g. a zip wrapped in myproject/ when
  your package dir is also myproject/). It's now resolved using the
  zip manifest instead of guessing from what's on disk.
• contextzip config --ui now closes its own browser tab after you save,
  instead of just telling you that you can.

Full Changelog: v0.4.2...v0.4.3