v0.21.0

Added

• /lcd:vendor [install|update|check] freezes LCD into the current project from a plugin
  session, so you no longer have to call lcd-vendor.sh by path. It previews with --dry-run,
  asks, applies, and runs doctor. On install it offers to set "enabledPlugins": {"lcd@lcd": false}
  in the project's .claude/settings.json so the plugin and the frozen copy don't both run.
  It calls its own plugin's script by path, because with two LCD copies loaded the name on PATH
  can resolve to another version.
  The frozen copy doesn't carry it (it carries /lcd-update instead); a test checks that.