I don’t know what are AP (and Chicago, maybe newspaper stuff), but your link says:
The AP Stylebook says to treat the ellipsis as a three-letter word, with spaces on either side of the ellipsis but no spaces between the dots.
But in my experience (French), there is a space only… after the ellipsis.
And yes… Unicode is better, IMO (Alt+0133 on Windows), it will not break between periods.
If you want spaces between each period and before the first one also included, make sure you are using no-break spaces.
So it’s more simple to use… the unicode character.
The auto guess case will do it this… way.
If you think there is strong artist intent to make them different, well… make them different.
the Unicode… is also better because it’ll display properly in filenames
in general, I only put a space after the ellipsis, unless the ellipsis is the first character, for example:
there are exceptions though… on the spine of the release below, there’s obviously no space on either side of the ellipsis, which is probably why it’s listed…that way most everywhere, including Wikipedia and Spotify.