v1.3.0

Release 1.3.0

Twenty-four features across six phases: the desktop split workspace
and broadcast input, server groups and colour tags, automatic
reconnection, jump hosts, the tunnel manager, in-app key generation
and installation, the remote editor, bookmarks and a cross-session
transfer panel, app lock and encrypted backup, and server stats,
log tailing and a service manager.

1392 tests, and two release blockers caught by running the built
application against a real server rather than a fake: session
connections carried an SSH agent handler, which made OpenSSH refuse
every exec channel after the shell claimed the connection's single
agent-forwarding grant, and the stats probe opened each section
with an unquoted # that sh swallowed as a comment.