wait for tmux at startup, force utf-8 for tmux clients, add launchd packaging

running under launchd, the tmux client defaults to the c locale, which
makes tmux mangle tab-separated -f output into underscores, so every
pane parsed as one field and the watcher silently saw nothing; invoke
tmux with -u so format output is locale-independent. drop the startup
fail-fast: the watcher now waits for a tmux server and attaches when one
appears, which is the right shape for a login agent. ship the launchd
plist under packaging/launchd.

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