rulogman 0.4.1: root edits over sudo, shells opened on a folder

• A file the connected user cannot write no longer fails to open: the
  editor opens it read-only, and on a remote host or a WSL distribution
  offers to edit it as root through sudo. The one-off commands that
  takes run on the session's own transport, so no second login is
  asked for.
• A path given on the command line - or a folder opened with rulogman
  from a file manager - starts a local shell standing in that
  directory, one tab per path, with a file taken to mean the folder
  holding it. The Linux desktop entry and the macOS bundle declare
  this, so a folder offers rulogman in "Open with".
• Menu rows whose commands cannot run where they are shown - splits
  and the file panel on the welcome screen, copy with nothing selected
  • are greyed instead of being offered.
• The SSH layer reads the exit status a real server sends after eof,
  so remote commands report how they ended.
• On Linux, install.sh writes the absolute path of the binary into the
  desktop entry, so the launcher works without ~/.local/bin on PATH,
  and the README names libxkbcommon-x11 as a runtime dependency.
• The winget manifests are re-issued for this version; the first
  winget-pkgs submission is made from them.