It is a template in the repository, not a dotfile in a home directory — and the
destination it is increasingly installed to, ~/.config/tmux/tmux.conf, has no dot
either. Naming the source after a path it may not be written to is how the wrong
file gets read.
The two remaining dotted references are correct and stay: they name the
DESTINATION ~/.tmux.conf, which does have a dot when that is where tmux looks.
.setup-answers and .setup-progress keep theirs too. They are runtime state in a
directory, not templates.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>