v0.7.0

Added

• clanker update replaces this binary with the latest verified GitHub
  release after the asset matches its .sha256 sidecar. --check reports
  the release and does not download or replace. --repo owner/name selects
  the repository (default maci0/clanker). A failed verification leaves the
  binary in place.

Fixed

• Icon controls in the web shell show their glyph instead of an empty
  labeled button. New chat uses the primary actuator. The rail drawer uses
  the cabinet elevation token. Labels in the masthead, rail, and composer
  stay inside their controls, and those regions do not widen the page.
• The web UI stylesheet is served as CSS. It was sent as JavaScript, so
  the browser refused to apply it.