feat(config): switch Goliath launch to mosh and tighten key repeat settings

dot_config/kitty/goliath.conf

@@ -1,7 +1,15 @@
-include ssh.conf
 listen_on unix:@kitty-goliath
-# open straight into goliath's tmux
-shell ssh -t goliath tmux new-session -A -s main
+# open straight into goliath's tmux, over mosh: the UDP session survives
+# suspend, roaming and dead links, and reconnects itself. mosh-server allocates
+# the remote pty, so there is no `ssh -t` equivalent to pass. Caveat: mosh runs
+# its bootstrap ssh with `-S none`, so it can never ride a ControlMaster --
+# non-interactive key auth to goliath must work or every launch prompts for a
+# password. Needs mosh on both ends and UDP 60000-61000 open on goliath.
+# mosh also rewrites TERM to xterm-256color (it only forwards a color count),
+# so xterm-kitty-only capabilities (undercurl, ...) are gone inside the session.
+# MOSH_TITLE_NOPREFIX drops mosh's "[mosh] " window-title prefix.
+env MOSH_TITLE_NOPREFIX=1
+shell mosh goliath -- tmux new-session -A -s main
 # structural keys forward to tmux (prefix C-b = \x02)
 map super+w     send_text all \x02x
 map super+t     send_text all \x02%