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As of 7640e95bd7 (Create user config file/directories only on
first startup again, 2025-12-29) we interpret absence of the
__fish_initialized variable as "this is the first run, so create
~/.config/fish/conf.d etc.".
As reported in #11226, the presence of this universal variable causes
friction to users who track ~/.config/fish/fish_variables in version
control.
Also, __fish_initialized is the only universal variable we create
by default.
Use another way to detect the first run: since we already create
~/.config/fish on every run, assume that a successful mkdir() means
we should also create the subdirectories.
This has false negatives (if the user already created the directory)
and false positives (if the user doesn't want ~/.config/fish to exist)
but at least the latter should not really matter because historically
we always created it, at least for ~/.config/fish/fish_variables.
Alternatively, we could create a file at ~/.cache/fish/first-run-done.
But let's not add more state unless there's a good reason.