v0.10.1

Adds make-trailing-command sibling to make-irc-command — unconditionally emits ':' on the last argument. irc-privmsg and irc-notice now use it, so short spaceless bodies like 'connected.' arrive with the body populated in irc-message-trailing instead of silently routed into params (and lost) by strict parsers.

make-irc-command itself is unchanged: MODE/NICK/PING and friends still emit unambiguous single-token last params without a colon, since those structurally identify operands rather than human text.

Surfaced by apiary's reconnect-presence broadcast hitting the bug end-to-end. 158-test suite green.