The launchd service runs with PATH=/usr/bin:/bin:/usr/sbin:/sbin; tmux
split-window gives the new pane the caller's PATH, so 'exec lf' failed
and the pane closed at once. install.sh now records its own PATH in the
plist EnvironmentVariables.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
