slosh --install-terminfo: the binary carries its own terminfo entry

The xterm-256color fallback works everywhere; the real entry is
better, and a tarball user on a bare box had no easy way to get it.
The entry is generated from the vendored tree (contrib/terminfo, so
it describes the terminal core we actually ship), compiled with tic,
embedded as bytes, and written to ~/.terminfo under every name it
answers to, letter and Darwin-hashed layouts both. No root, no
package, no conflict with a ghostty installed later. Proven end to
end in a mount namespace: bare box falls back, installs, and the
next pane says xterm-ghostty.

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